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MONDO

MONDO:0018019 lead poisoning

Primary MONDO disease identifier for this lead poisoning entry.

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Definitions

2

Clinical multisystem toxicity case definition for lead poisoning

Lead poisoning is a toxic disorder caused by exposure to the non-essential heavy metal lead, with multisystem adverse effects and no safe exposure threshold identified.

CASE_DEFINITION Disease-level clinical framing across acute and chronic lead exposure

Show evidence (2 references)

PMID:40981357 SUPPORT Other

"Lead (Pb) is a non-essential, toxic heavy metal with no known biological function that has caused widespread environmental contamination throughout human history."

Supports the core disease framing as toxic illness caused by exposure to a non-essential heavy metal.

PMID:40981357 SUPPORT Other

"Pb toxicity represents one of the most persistent environmental health challenges, with no safe exposure threshold identified."

Supports inclusion of the no-safe-threshold concept in the disease-level definition.

Practical diagnostic definition for clinically significant lead exposure

Clinical definition of lead poisoning relies on demonstration of elevated venous blood lead concentration in the relevant clinical context, with body-burden assessment needed when chronic lead nephropathy is suspected.

DIAGNOSTIC_CRITERIA Clinical diagnosis and complication-focused workup in exposed patients

Show evidence (2 references)

PMID:37478813 SUPPORT Human Clinical

"Consequently, in 2021, the Centers for Disease Control and Prevention (CDC) reduced its blood lead reference value from 5 µg/dL to 3.5 µg/dL in pediatric patients, 1 to 5 years old."

Supports venous blood lead concentration as the central contemporary clinical benchmark for defining significant pediatric lead exposure.

PMID:8475950 SUPPORT Other

"Only evaluation of body lead stores by either the EDTA lead mobilization test or by x-ray fluorescence is helpful in diagnosing lead nephropathy."

Supports refinement of the clinical definition in chronic nephropathy, where blood lead alone may not capture retained body burden.

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Subtypes

2

Acute Lead Poisoning

Acute lead poisoning follows high-dose ingestion or inhalation and may present with severe abdominal pain, vomiting, encephalopathy, hemolysis, acute kidney injury, and rapidly rising blood lead concentrations.

Show evidence (1 reference)

PMID:3103564 SUPPORT Human Clinical

"A prospective study of an epidemic outbreak of acute lead poisoning characterized by unusual clinical and analytic manifestations was carried out."

Directly supports acute lead poisoning as a clinically recognizable subtype.

Chronic Lead Poisoning

Chronic lead poisoning results from sustained lower-level exposure with progressive neurocognitive effects, constipation, anemia, peripheral neuropathy, chronic kidney disease, and hypertension. Bone stores become a long-term endogenous reservoir for recurrent lead release.

Show evidence (1 reference)

PMID:1030853 SUPPORT Human Clinical

"Clinical, biochemical, haematological and erythrokinetic studies were performed on 63 adult males with prolonged lead exposure."

Supports chronic lead poisoning as a distinct syndrome of prolonged exposure with multisystem clinical findings.

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Pathophysiology

12

Lead absorption

Lead enters the body through gastrointestinal and respiratory absorption.

transmembrane transport GO:0055085 ⚠ ABNORMAL

Downstream

Systemic lead distribution Absorbed lead enters the bloodstream and is distributed to soft tissues and bone.

Show evidence (1 reference)

PMID:40981357 SUPPORT Other

"Pb enters organisms through multiple pathways and causes severe health impacts across all biological systems, with particularly devastating neurodevelopmental and bone effects in children and cardiovascular and reproductive consequences in adults."

Supports lead entry through multiple exposure pathways and its capacity to reach multiple organ systems.

Systemic lead distribution

Absorbed lead circulates systemically and persists in biologic tissues, allowing redistribution into bone, erythroid tissues, neurons, and kidney.

Downstream

Bone sequestration of lead Systemically absorbed lead is progressively redistributed into bone stores.

Inhibition of delta-aminolevulinic acid dehydratase Circulating lead reaches erythroid tissues and inhibits a key heme biosynthetic enzyme.

Calcium mimicry in neuronal signaling Lead acts as an ionic mimic of calcium in intracellular signaling pathways.

Proximal tubular lead accumulation Chronic systemic exposure leads to progressive renal cortical accumulation.

Show evidence (1 reference)

PMID:40981357 SUPPORT Other

"The metal demonstrates remarkable persistence in biological systems, with approximately 90% of it stored in bone tissue for decades, mimicking calcium due to its similar ionic properties."

Supports systemic persistence and redistribution of lead into long-lived tissue reservoirs.

Bone sequestration of lead

Most retained lead is deposited in bone, where it replaces calcium within mineralized tissue and serves as a long-term endogenous source of ongoing exposure during bone turnover.

osteoblast CL:0000062

calcium ion homeostasis GO:0055074 ⚠ ABNORMAL

Show evidence (2 references)

PMID:40981357 SUPPORT Other

"The metal demonstrates remarkable persistence in biological systems, with approximately 90% of it stored in bone tissue for decades, mimicking calcium due to its similar ionic properties."

Supports bone sequestration as a defining kinetic feature of lead poisoning.

PMID:20643234 SUPPORT Model Organism

"These data show that lead increases bone turnover resulting in weaker cortical bone in adult female mice and suggest that lead may exacerbate bone loss and osteoporosis in the elderly."

Mouse data support direct adverse skeletal consequences of chronic bone lead deposition.

Inhibition of delta-aminolevulinic acid dehydratase

Lead inhibits delta-aminolevulinic acid dehydratase (ALAD), a zinc-dependent heme biosynthetic enzyme. This is an early and sensitive biochemical lesion of lead exposure and contributes to defective heme production.

erythrocyte CL:0000232

heme biosynthetic process GO:0006783 ↓ DECREASED

Downstream

Anemia Impaired heme synthesis contributes to reduced erythrocyte function and clinical anemia.

Show evidence (1 reference)

PMID:3442386 SUPPORT Human Clinical

"ALAD is a zinc metalloenzyme whose inhibition by lead is the first and most sensitive indicator of lead exposure and whose decreased activity has been implicated in the pathogenesis of lead poisoning."

Directly supports ALAD inhibition as a central biochemical mechanism in lead toxicity.

Erythrocyte pyrimidine 5'-nucleotidase deficiency

Lead intoxication causes an acquired erythrocyte pyrimidine 5'-nucleotidase deficiency, leading to abnormal pyrimidine nucleotide handling and basophilic stippling.

erythrocyte CL:0000232

pyrimidine-containing compound biosynthetic process GO:0072528 ⚠ ABNORMAL

Downstream

Hemolytic erythrocyte injury Lead-induced erythrocyte enzyme dysfunction contributes to downstream hemolytic injury.

Show evidence (1 reference)

PMID:965496 SUPPORT Human Clinical

"Lead intoxication is accompanied by an acquired deficiency of erythrocyte pryimidine-specific, 5'-nucleotidase."

Supports lead-induced erythrocyte enzymatic injury as a mechanism of hematologic toxicity.

Hemolytic erythrocyte injury

Lead-associated erythrocyte injury increases hemolysis and contributes to clinically significant anemia.

erythrocyte CL:0000232

Downstream

Anemia Hemolytic erythrocyte injury contributes to hemolytic anemia in lead intoxication.

Show evidence (1 reference)

PMID:965496 SUPPORT Human Clinical

"The findings indicate that the hemolytic anemia and increased basophilic stippling characteristic of certain cases of lead intoxication may share a common etiology with essentially identical features of the genetically determined disorder."

Supports hemolytic erythrocyte injury as a distinct hematologic event in lead intoxication.

Calcium mimicry in neuronal signaling

Lead acts as a calcium substitute in intracellular signaling, perturbing calcium-dependent neuronal regulatory pathways.

neuron CL:0000540

calcium ion homeostasis GO:0055074 ⚠ ABNORMAL

Downstream

Protein kinase C dysregulation Lead substitution for calcium perturbs second-messenger signaling and promotes downstream protein kinase C dysregulation.

Show evidence (1 reference)

PMID:8247416 SUPPORT Other

"Our investigations of the ability of lead to substitute for calcium in several intracellular regulatory events are reviewed in the context of the neurotoxicity produced by this heavy metal."

Supports calcium mimicry as a distinct upstream mechanism of lead neurotoxicity.

Protein kinase C dysregulation

Lead-induced disturbance of second-messenger signaling alters protein kinase C activation and other calcium-regulated neuronal signaling outputs.

neuron CL:0000540

Downstream

Cognitive impairment Dysregulated neuronal signaling contributes to impaired cognition and neurodevelopment.

Show evidence (1 reference)

PMID:8247416 SUPPORT Other

"Taken together these studies implicate second messenger metabolism and protein kinase activation as potential sites for the disruptive action of lead upon nervous system function."

Supports protein kinase activation dysregulation as a distinct downstream neuronal signaling event in lead toxicity.

Mitochondrial dysfunction

Lead poisoning perturbs mitochondrial function across multiple organ systems, contributing to cellular energy failure and tissue injury.

mitochondrion organization GO:0007005 ⚠ ABNORMAL

Show evidence (1 reference)

PMID:40981357 SUPPORT Other

"On a molecular level, Pb disrupts cellular processes through ion mimicry, replacing essential metals in enzymes and proteins and leading to mitochondrial dysfunction, oxidative stress, DNA damage, and epigenetic modifications."

Supports mitochondrial dysfunction as a distinct downstream mechanism of lead toxicity.

Oxidative stress response

Lead exposure increases oxidative stress signaling and contributes to multisystem cellular injury.

response to oxidative stress GO:0006979 ↑ INCREASED

Show evidence (1 reference)

PMID:40981357 SUPPORT Other

"On a molecular level, Pb disrupts cellular processes through ion mimicry, replacing essential metals in enzymes and proteins and leading to mitochondrial dysfunction, oxidative stress, DNA damage, and epigenetic modifications."

Supports oxidative stress as a distinct downstream mechanism of lead toxicity.

Proximal tubular lead accumulation

Lead accumulates in proximal renal tubular cells, where it forms inclusion bodies and produces potentially reversible proximal tubular dysfunction in acute toxicity.

proximal tubule cell CL:0002306

renal absorption GO:0070293 ⚠ ABNORMAL

Downstream

Chronic tubulointerstitial nephropathy Persistent proximal tubular lead injury progresses to chronic tubulointerstitial renal disease.

Show evidence (2 references)

PMID:2650022 SUPPORT Other

"Exposure to lead results in accumulation in proximal renal tubular lining cells in the form of morphologically discernible inclusion bodies which are lead-protein complexes."

Supports proximal tubular accumulation as the initial renal lesion of lead nephrotoxicity.

PMID:2650022 SUPPORT Other

"Acute nephrotoxicity consists of proximal tubular dysfunction and can be reversed by treatment with chelating agents."

Supports proximal tubular dysfunction as the dominant acute renal consequence of lead accumulation.

Chronic tubulointerstitial nephropathy

Chronic lead nephrotoxicity is a tubulointerstitial renal disease marked by interstitial fibrosis, progressive nephron loss, and associated hyperuricemia, gout, and hypertension.

proximal tubule cell CL:0002306

Downstream

Chronic kidney disease Progressive nephron loss in chronic lead nephropathy produces persistent chronic kidney disease.

Gout Lead-related renal dysfunction promotes hyperuricemia and gout.

Hypertension Chronic lead nephropathy frequently presents with hypertension.

Show evidence (2 references)

PMID:2650022 SUPPORT Other

"Chronic lead nephrotoxicity consists of interstitial fibrosis and progressive nephron loss, azotaemia and renal failure. Potential complications of lead nephropathy include gout and hypertension."

Supports the chronic fibrosing renal phenotype and its hypertensive complication.

PMID:8475950 SUPPORT Other

"Renal function and biopsy studies showed that lead nephropathy is a chronic tubulointerstitial renal disease with modest proteinuria which frequently presents with hyperuricemia, gout and hypertension."

Confirms the clinical pattern of chronic tubulointerstitial nephropathy in lead poisoning.

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Histopathology

2

Basophilic stippling of erythrocytes

Peripheral blood smear may show basophilic stippling of red blood cells due to aggregated ribosomes in lead intoxication. This is a classic but nonspecific microscopic finding.

Show evidence (2 references)

PMID:6202140 SUPPORT Human Clinical

"Basophilic stippling of red blood cells (BSC) has been noted in lead intoxication since 1899 and has been considered a classic laboratory sign of lead poisoning since that time."

Supports basophilic stippling as the classic hematologic microscopic finding in lead poisoning.

PMID:1030853 SUPPORT Human Clinical

"Other associated findings were: higher reticulocyte counts and more basophilic stippling of the RBCs, more sideroblasts and greater erythroid hyperplasia of the bone marrow"

Supports basophilic stippling as an observed microscopic feature in chronically lead-exposed patients.

Proximal tubular nuclear inclusion bodies

Early lead nephropathy is characterized by proximal tubular nuclear inclusion bodies formed by lead-protein complexes, alongside chronic tubulointerstitial disease and fibrosis.

Show evidence (2 references)

PMID:2650022 SUPPORT Other

"Exposure to lead results in accumulation in proximal renal tubular lining cells in the form of morphologically discernible inclusion bodies which are lead-protein complexes."

Supports proximal tubular nuclear inclusion bodies as a characteristic microscopic renal lesion in lead nephrotoxicity.

PMID:19106433 SUPPORT Other

"both entities are characterized by tubulointerstitial disease and fibrosis, but only early lead nephropathy is characterized by the presence of proximal tubule nuclear inclusion bodies, due to the combination of lead with a lead binding-protein."

Distinguishes lead nephropathy histopathology from cadmium nephropathy by the presence of proximal tubular nuclear inclusion bodies.

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Pathograph

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Phenotypes

12

Blood 1

Anemia FREQUENT Anemia HP:0001903

Show evidence (2 references)

PMID:37478813 SUPPORT Human Clinical

"Exposure to lead may cause severe adverse effects such as anemia, neurologic damage, developmental disorders, and reproductive disorders."

Supports anemia as a major adverse clinical effect of lead exposure.

PMID:965496 SUPPORT Human Clinical

"The findings indicate that the hemolytic anemia and increased basophilic stippling characteristic of certain cases of lead intoxication may share a common etiology with essentially identical features of the genetically determined disorder."

Supports hemolytic anemia as a clinically important hematologic manifestation of lead intoxication.

Cardiovascular 1

Hypertension OCCASIONAL Hypertension HP:0000822

Show evidence (1 reference)

PMID:8475950 SUPPORT Other

"Renal function and biopsy studies showed that lead nephropathy is a chronic tubulointerstitial renal disease with modest proteinuria which frequently presents with hyperuricemia, gout and hypertension."

Supports hypertension as a common complication of chronic lead nephropathy.

Digestive 1

Constipation FREQUENT Constipation HP:0002019

Show evidence (1 reference)

PMID:29531415 SUPPORT Human Clinical

"In February 2016, we noticed a steep increase in the numbers of oral opium users referred to our poison treatment centre with abdominal pain, anaemia and constipation."

Outbreak data provide direct human clinical support for constipation as a common presenting feature of lead poisoning.

Genitourinary 1

Chronic kidney disease OCCASIONAL Chronic kidney disease HP:0012622

Show evidence (1 reference)

PMID:9300927 SUPPORT Other

"Chronic occupational exposure to lead, or consumption of illicit alcohol adulterated with lead, has also been linked to a high incidence of renal dysfunction, which is characterized by glomerular and tubulointerstitial changes resulting in chronic renal failure, hypertension, hyperuricemia, and gout."

Supports chronic kidney disease as a clinically important manifestation of chronic lead nephrotoxicity.

Head and Neck 1

Gingival lead line OCCASIONAL Abnormality of the gingiva HP:0000168

Show evidence (1 reference)

PMID:6943483 SUPPORT Human Clinical

"A diagnosis of chronic lead poisoning in a mentally retarded adult with pica was initially proposed because of the presence of a "lead line" on the patient's gingiva."

Direct human clinical evidence supports Burton-line gingival changes as a classic physical finding in chronic lead poisoning.

Musculoskeletal 1

Gout OCCASIONAL Gout HP:0001997

Show evidence (1 reference)

PMID:8475950 SUPPORT Other

"Renal function and biopsy studies showed that lead nephropathy is a chronic tubulointerstitial renal disease with modest proteinuria which frequently presents with hyperuricemia, gout and hypertension."

Supports gout as a recognized metabolic complication of chronic lead nephropathy.

Nervous System 5

Encephalopathy OCCASIONAL Encephalopathy HP:0001298

Show evidence (1 reference)

PMID:29523605 SUPPORT Human Clinical

"A 2-year-old boy with a history of pica was admitted with vomiting and treated overnight for viral tonsillitis. A week later, he presented with a prolonged afebrile seizure and required intubation and ventilation."

Direct human case evidence supports severe childhood lead encephalopathy with seizure and critical neurologic deterioration.

Cognitive impairment FREQUENT Cognitive impairment HP:0100543

Show evidence (1 reference)

PMID:28889260 SUPPORT Other

"In utero and early life exposures to lead have been associated with lower IQ, antisocial and delinquent behaviors, and attention-deficit hyperactivity disorder."

Supports cognitive and neurobehavioral impairment as a major consequence of developmental lead exposure.

Developmental delay FREQUENT Global developmental delay HP:0001263

Show evidence (1 reference)

PMID:37478813 SUPPORT Human Clinical

"Exposure to lead may cause severe adverse effects such as anemia, neurologic damage, developmental disorders, and reproductive disorders."

Supports developmental delay and related developmental disorders as major pediatric consequences of lead exposure.

Behavioral changes OCCASIONAL Atypical behavior HP:0000708

Show evidence (1 reference)

PMID:28889260 SUPPORT Other

"In utero and early life exposures to lead have been associated with lower IQ, antisocial and delinquent behaviors, and attention-deficit hyperactivity disorder."

Supports behaviorally abnormal neurodevelopmental outcomes as a clinically important consequence of developmental lead exposure.

Peripheral neuropathy OCCASIONAL Peripheral neuropathy HP:0009830

Show evidence (2 references)

PMID:17405745 SUPPORT Human Clinical

"We describe a 47-year-old patient with chronic anaemia with basophilic stippling of erythrocytes, recurrent abdominal colics, discoloration of gums, sensitive polyneuropathy to the four limbs, hyperuricaemia, hepatosteatosis with raised transaminases, and a long ignored history of lead exposure..."

Direct human case evidence supports peripheral polyneuropathy as a neurologic manifestation of lead toxicity.

PMID:20142857 SUPPORT Human Clinical

"Neuropathy is one complication of lead poisoning."

Supports lead neuropathy, including occupational radial neuropathy, as a recognized complication of lead poisoning.

Constitutional 1

Abdominal pain FREQUENT Abdominal pain HP:0002027

Show evidence (1 reference)

PMID:17405745 SUPPORT Human Clinical

"We describe a 47-year-old patient with chronic anaemia with basophilic stippling of erythrocytes, recurrent abdominal colics, discoloration of gums, sensitive polyneuropathy to the four limbs, hyperuricaemia, hepatosteatosis with raised transaminases, and a long ignored history of lead exposure..."

Direct human case evidence supports recurrent abdominal colic as a characteristic manifestation of lead poisoning.

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Medical Actions

4

Exposure cessation and source control

Action: supportive care MAXO:0000950

The first intervention is removal from the lead source and prevention of ongoing exposure.

Mechanism Target:

INHIBITS Lead absorption — Source control prevents continued lead entry and lowers ongoing systemic burden.

Show evidence (1 reference)

PMID:8475950 SUPPORT Other

"While chelation therapy is safe and helpful in reversing early lead nephropathy, the best treatment is prevention."

Supports exposure prevention as the primary intervention that blocks continued toxic lead burden.

Show evidence (1 reference)

PMID:8475950 SUPPORT Other

"While chelation therapy is safe and helpful in reversing early lead nephropathy, the best treatment is prevention."

Supports exposure prevention and source removal as the foundational management strategy.

Succimer chelation

Action: chelator agent therapy MAXO:0001223

Oral succimer is used as a lead chelator, particularly in children with elevated blood lead concentrations.

Mechanism Target:

INHIBITS Systemic lead distribution — Succimer lowers circulating and soft-tissue lead burden by forming excretable complexes with lead.

Show evidence (1 reference)

PMID:1663439 SUPPORT Other

"Succimer is an orally active, heavy-metal chelating agent that forms stable, water-soluble complexes with lead; it also chelates other toxic heavy metals, such as arsenic and mercury."

Directly supports chelation of systemic lead as the proximate treatment mechanism of succimer.

Show evidence (1 reference)

PMID:1663439 SUPPORT Other

"It is a designated orphan drug that is indicated for the treatment of lead poisoning, specifically in children with blood lead concentrations higher than 45 micrograms/dL."

Directly supports succimer as an indicated chelation therapy for pediatric lead poisoning.

Calcium disodium edetate chelation

Action: chelator agent therapy MAXO:0001223

Calcium disodium EDTA chelation is used in selected patients with significant body lead burden, particularly when nephropathy is present.

Show evidence (1 reference)

PMID:8475950 SUPPORT Other

"While chelation therapy is safe and helpful in reversing early lead nephropathy, the best treatment is prevention."

Supports chelation therapy, including EDTA-based approaches discussed in lead nephropathy, as helpful in early disease.

Dimercaprol chelation

Action: chelator agent therapy MAXO:0001223

Dimercaprol is used with calcium disodium EDTA in more severely intoxicated patients, including severe acute lead poisoning and lead encephalopathy.

Show evidence (1 reference)

PMID:3540517 SUPPORT Other

"Treatment of patients with positive chelation tests involves symptomatic treatment and a course of chelation therapy utilising calcium disodium edetate in doses similar to those used for testing, and in the more severely intoxicated patient, the addition of dimercaprol in doses of 75 mg/m2 every..."

Supports dimercaprol as an established adjunct chelator for severe lead intoxication.

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Environmental Factors

10

Lead-based paint

Deteriorating lead-based paint remains a major pediatric exposure source, especially where older housing stock is present.

Show evidence (1 reference)

PMID:28889260 SUPPORT Other

"Environmental exposures to lead, predominantly from contaminated water or lead paint chips, account for the majority of exposures to children."

Supports lead paint as a major pediatric exposure source.

Household dust

Contaminated household dust is an important secondary exposure source for children, especially in homes with legacy lead contamination.

Show evidence (1 reference)

PMID:32651990 SUPPORT Human Clinical

"Thus, house dust is an important source of lead exposure in Pakistani children."

Direct human exposure data support contaminated household dust as a meaningful pediatric lead source.

Contaminated drinking water

Lead in drinking water from aging infrastructure remains an important source of environmental exposure.

Show evidence (1 reference)

PMID:28889260 SUPPORT Other

"Environmental exposures to lead, predominantly from contaminated water or lead paint chips, account for the majority of exposures to children."

Supports contaminated water as a major exposure source.

Contaminated spices and turmeric

Lead-contaminated food products, especially locally sourced spices and turmeric, can materially increase blood lead levels in children.

Show evidence (1 reference)

PMID:36962532 SUPPORT Human Clinical

"Children in Patna, Bihar, India are exposed to multiple sources of lead, with lead levels in house dust and loose, locally sourced spices the most likely to increase blood lead levels."

Direct pediatric exposure data support contaminated spices as a foodborne source of lead exposure.

Lead-soldered food and drink cans

Historically, lead-soldered food and drink cans were an important dietary exposure source before population-level control efforts reduced this route.

Show evidence (1 reference)

PMID:9799191 SUPPORT Human Clinical

"Public health efforts have been successful in removing lead from population-wide sources such as gasoline and lead-soldered food and drink cans, but new efforts must address the difficult problem of leaded paint, especially in older houses, as well as lead in dust and soil."

Supports lead-soldered food and drink cans as a recognized historical food-related source of lead exposure.

Battery manufacture

Occupational and para-occupational lead exposure occurs in battery manufacture and related industrial handling.

Show evidence (1 reference)

PMID:40981357 SUPPORT Other

"Contemporary contamination primarily stems from mining activities, battery manufacturing, electronic waste recycling, and deteriorating infrastructure."

Supports battery manufacturing as a contemporary industrial exposure source for lead poisoning.

Mining

Mining activities remain an important occupational and community source of lead contamination and exposure.

Show evidence (1 reference)

PMID:40981357 SUPPORT Other

"Contemporary contamination primarily stems from mining activities, battery manufacturing, electronic waste recycling, and deteriorating infrastructure."

Supports mining activities as a contemporary source of lead exposure.

E-waste recycling

Electronic waste recycling is an important contemporary source of lead exposure through handling and processing of contaminated materials.

Show evidence (1 reference)

PMID:40981357 SUPPORT Other

"Contemporary contamination primarily stems from mining activities, battery manufacturing, electronic waste recycling, and deteriorating infrastructure."

Supports electronic waste recycling as a contemporary source of lead exposure.

Lead-adulterated oral opium

Illicit oral opium contaminated with lead can cause major community outbreaks of lead poisoning, especially with chronic use.

Show evidence (2 references)

PMID:29531415 SUPPORT Human Clinical

"Lead-contaminated opium and heroin that has transited through the Iranian markets is a global risk and highlights a need for better monitoring of illegal drug supplies."

Supports adulterated oral opium as a documented non-occupational source of lead poisoning.

PMID:29531415 SUPPORT Human Clinical

"Analysis of an illegal opium sample showed 3.55 mg lead in 1 g opium."

Directly demonstrates lead contamination of illicit opium as the proximate exposure source in a large outbreak.

Lead-adulterated heroin

Illicit heroin contaminated with lead is a documented non-occupational exposure source that can contribute to community lead poisoning.

Show evidence (1 reference)

PMID:29531415 SUPPORT Human Clinical

"Lead-contaminated opium and heroin that has transited through the Iranian markets is a global risk and highlights a need for better monitoring of illegal drug supplies."

Supports adulterated heroin as a documented non-occupational source of lead poisoning.

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Biochemical Markers

2

Blood Lead Level (INCREASED)

Show evidence (1 reference)

PMID:37478813 SUPPORT Human Clinical

"Consequently, in 2021, the Centers for Disease Control and Prevention (CDC) reduced its blood lead reference value from 5 µg/dL to 3.5 µg/dL in pediatric patients, 1 to 5 years old."

Supports blood lead concentration as the central biomarker for diagnosis and public-health intervention.

Zinc Protoporphyrin (INCREASED)

Show evidence (1 reference)

PMID:6202140 SUPPORT Human Clinical

"Furthermore, BSC has been replaced by blood lead (since the 1940s) and zinc protoporphyrin (since the 1970s) levels for biologic monitoring of lead-exposed workers."

Supports zinc protoporphyrin as a laboratory biomarker used in monitoring lead exposure.

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Differential Diagnoses

2

Conditions with similar clinical presentations that must be differentiated from Lead Poisoning:

Cadmium Poisoning MONDO:0043523

Overlapping Features Cadmium poisoning overlaps with lead toxicity through chronic occupational exposure and proximal tubular nephrotoxicity, but the renal phenotype and associated laboratory findings differ.

Distinguishing Features

Cadmium causes Fanconi syndrome with low-molecular-weight proteinuria and beta2-microglobulinuria
Lead nephropathy instead is associated with hyperuricemia, gout, and hypertension
Proximal tubule nuclear inclusion bodies are characteristic of early lead nephropathy

Show evidence (2 references)

PMID:19106433 SUPPORT Other

"Cadmium in sufficient cumulative dosage leads to the production of the Fanconi syndrome, a generalized proximal tubular reabsorptive defect thought to be related to inhibition of both ATP production and Na-K-ATPase activity. On the other hand, lead accumulation in the proximal tubule leads to..."

Directly contrasts cadmium and lead nephrotoxicity, supporting cadmium poisoning as a major differential diagnosis.

PMID:19106433 SUPPORT Other

"Beta2-microglobulinuria is not found in lead nephropathy."

Supports beta2-microglobulinuria as a distinguishing feature favoring cadmium over lead toxicity.

Arsenic Poisoning

Overlapping Features Arsenic poisoning can overlap with lead poisoning through gastrointestinal symptoms and neuropathy, but chronic arsenic exposure more strongly features characteristic skin findings and carcinogenic sequelae.

Distinguishing Features

Chronic arsenic exposure causes hyperpigmentation and palmoplantar keratoses
Arsenic exposure is strongly associated with skin, lung, and bladder cancer
Lead poisoning more characteristically shows basophilic stippling, lead-line gingival changes, and ALAD inhibition

Show evidence (2 references)

PMID:28005215 SUPPORT Other

"It is proven fact that uptake of inorganic As for a long period can lead to chronic As poisoning and a variety of adverse health effects such as skin, lung and bladder cancer, in addition to cardiovascular diseases, diabetes and gastrointestinal symptoms."

Supports the chronic dermatologic and carcinogenic profile that distinguishes arsenic poisoning from lead toxicity.

PMID:17405745 SUPPORT Human Clinical

"We describe a 47-year-old patient with chronic anaemia with basophilic stippling of erythrocytes, recurrent abdominal colics, discoloration of gums, sensitive polyneuropathy to the four limbs, hyperuricaemia, hepatosteatosis with raised transaminases, and a long ignored history of lead exposure..."

Supports the lead-specific constellation of basophilic stippling, abdominal colic, and occupational exposure history.

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Related Datasets

2

Methodoligies for identifying lead toxicity geo:GSE37567

Human PBMC transcriptomic dataset used to quantify the impact of lead on cytokine production and gene expression in peripheral blood mononuclear cells.

human MICROARRAY n=102

peripheral blood mononuclear cells CL:0000842

Conditions: lead-associated PBMC cytokine and gene-expression profiling

Show evidence (1 reference)

GEO:GSE37567 SUPPORT In Vitro

"Quantifying impact of lead on cytokine production and gene expression in PBMCs"

Supports this dataset as a lead-relevant PBMC transcriptomic resource.

Early life Lead exposure causes distinct gender specific changes in the DNA methylation profile of DNA extracted from dried blood spots geo:GSE60598

Human methylation dataset from dried blood spots in a Detroit pediatric cohort, profiling sex-specific epigenomic effects of early-life lead exposure.

human METHYLATION n=43

dried blood spots

Conditions: early-life lead exposure pediatric blood-spot methylation profiling

Exposures: lead exposure ECTO:9000945

Show evidence (1 reference)

GEO:GSE60598 SUPPORT Human Clinical

"Study of influence of gender and Lead(Pb) exposure on DNA methylation for whole blood measured in dried blood spots for a Detroit cohort of child between the age of 3 months to 5years"

Supports this dataset as a pediatric human epigenomic resource for lead exposure effects.

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Clinical Trials

3

NCT00342849 PHASE_III COMPLETED

Treatment of Lead-Exposed Children (TLC) was a randomized, double-blind, placebo-controlled multicenter trial comparing succimer chelation with placebo in lead-exposed children, with follow-up focused on IQ, neuropsychological function, behavior, growth, and blood pressure.

Target Phenotypes: cognitive impairment HP:0100543

Show evidence (2 references)

clinicaltrials:NCT00342849 SUPPORT Human Clinical

"The Treatment of Lead-Exposed Children (TLC) clinical trial compared the effect of lead chelation with succimer to placebo therapy."

Supports a definitive randomized therapeutic trial of succimer in lead-exposed children.

clinicaltrials:NCT00342849 SUPPORT Human Clinical

"The study was designed to test outcomes in IQ, neuropsychological function, behavior, physical growth and blood pressure three years after initiation of treatment."

Supports neurocognitive and physiologic outcome assessment relevant to lead toxicity.

NCT01573013 NOT_APPLICABLE COMPLETED

Interventional study in Morocco evaluating whether iron fortification, with or without NaFeEDTA, can reduce blood lead levels and improve growth, motor performance, cognition, and iron status in lead-exposed children.

Target Phenotypes: anemia HP:0001903 cognitive impairment HP:0100543

Show evidence (2 references)

clinicaltrials:NCT01573013 SUPPORT Human Clinical

"In a follow-on intervention study, the effect of iron fortification with and without NaEDTA on blood lead levels in lead-exposed children will be evaluated; and the relative impact of these two strategies on child growth, motor and cognitive test performance will be compared."

Supports an interventional trial targeting both lead burden and functional outcomes in exposed children.

clinicaltrials:NCT01573013 SUPPORT Human Clinical

"This study will investigate the potential use of iron fortification to not only combat anemia but also reduce body lead burden in lead-exposed populations; it specifically investigates whether iron fortification with NaFeEDTA could have additional beneficial effects to iron alone."

Supports anemia-focused nutritional intervention as part of lead poisoning management research.

NCT05507021 NOT_APPLICABLE COMPLETED

Randomized, placebo-controlled pilot trial evaluating Lactobacillus plantarum DSM 33464 as a biologic intervention to reduce blood lead levels in young women of child-bearing age.

Target Phenotypes: anemia HP:0001903 cognitive impairment HP:0100543

Show evidence (2 references)

clinicaltrials:NCT05507021 SUPPORT Human Clinical

"We hypothesize that Lactobacillus Plantarum DSM 33464 reduce lead levels."

Supports a completed pilot interventional study aimed at lowering blood lead burden.

clinicaltrials:NCT05507021 SUPPORT Human Clinical

"From that pool of subjects, 40 healthy women aged 18 to 40 years will participate in this randomized, placebo controlled pilot clinical trial."

Supports the interventional randomized design of this lead-reduction trial.

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name: Lead Poisoning
creation_date: "2026-03-10T20:45:26Z"
updated_date: "2026-05-09T17:46:55Z"
category: Environmental
categories:
- Toxic Exposure Disorder
- Heavy Metal Poisoning
- Environmental Health Disorder
synonyms:
- plumbism
- saturnism
description: >-
  Lead poisoning is a toxic condition caused by acute or chronic exposure to
  lead, a non-essential heavy metal encountered through deteriorating lead-based
  paint, contaminated drinking water, battery manufacture and recycling,
  mining and smelting, electronic waste, and other occupational or environmental
  sources. Children are especially vulnerable because lead disrupts nervous
  system development even at relatively low blood lead concentrations. Lead
  toxicity reflects calcium mimicry, inhibition of heme biosynthesis, oxidative
  stress, mitochondrial dysfunction, and chronic accumulation in bone and kidney.
  Clinical manifestations include abdominal pain, constipation, anemia,
  cognitive impairment, peripheral neuropathy, nephropathy, and hypertension.
disease_term:
  preferred_term: lead poisoning
  term:
    id: MONDO:0018019
    label: lead poisoning
mappings:
  mondo_mappings:
  - term:
      id: MONDO:0018019
      label: lead poisoning
    mapping_predicate: skos:exactMatch
    mapping_source: MONDO
    mapping_justification: Primary MONDO disease identifier for this lead poisoning entry.
definitions:
- name: Clinical multisystem toxicity case definition for lead poisoning
  definition_type: CASE_DEFINITION
  description: >-
    Lead poisoning is a toxic disorder caused by exposure to the non-essential
    heavy metal lead, with multisystem adverse effects and no safe exposure
    threshold identified.
  scope: Disease-level clinical framing across acute and chronic lead exposure
  evidence:
  - reference: PMID:40981357
    reference_title: "The Mechanisms of Lead Toxicity in Living Organisms."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Lead (Pb) is a non-essential, toxic heavy metal with no known biological function that has caused widespread environmental contamination throughout human history."
    explanation: Supports the core disease framing as toxic illness caused by exposure to a non-essential heavy metal.
  - reference: PMID:40981357
    reference_title: "The Mechanisms of Lead Toxicity in Living Organisms."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Pb toxicity represents one of the most persistent environmental health challenges, with no safe exposure threshold identified."
    explanation: Supports inclusion of the no-safe-threshold concept in the disease-level definition.
- name: Practical diagnostic definition for clinically significant lead exposure
  definition_type: DIAGNOSTIC_CRITERIA
  description: >-
    Clinical definition of lead poisoning relies on demonstration of elevated
    venous blood lead concentration in the relevant clinical context, with
    body-burden assessment needed when chronic lead nephropathy is suspected.
  scope: Clinical diagnosis and complication-focused workup in exposed patients
  evidence:
  - reference: PMID:37478813
    reference_title: "Trends in Blood Lead Levels Quantified by ICP-MS: A Reference Laboratory Retrospective Study."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Consequently, in 2021, the Centers for Disease Control and Prevention (CDC) reduced its blood lead reference value from 5 µg/dL to 3.5 µg/dL in pediatric patients, 1 to 5 years old."
    explanation: Supports venous blood lead concentration as the central contemporary clinical benchmark for defining significant pediatric lead exposure.
  - reference: PMID:8475950
    reference_title: "Lead nephropathy, gout, and hypertension."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Only evaluation of body lead stores by either the EDTA lead mobilization test or by x-ray fluorescence is helpful in diagnosing lead nephropathy."
    explanation: Supports refinement of the clinical definition in chronic nephropathy, where blood lead alone may not capture retained body burden.
parents:
- heavy metal poisoning
has_subtypes:
- name: Acute Lead Poisoning
  description: >-
    Acute lead poisoning follows high-dose ingestion or inhalation and may
    present with severe abdominal pain, vomiting, encephalopathy, hemolysis,
    acute kidney injury, and rapidly rising blood lead concentrations.
  evidence:
  - reference: PMID:3103564
    reference_title: "Acute-subacute lead poisoning. Clinical findings and comparative study of diagnostic tests."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "A prospective study of an epidemic outbreak of acute lead poisoning characterized by unusual clinical and analytic manifestations was carried out."
    explanation: Directly supports acute lead poisoning as a clinically recognizable subtype.
- name: Chronic Lead Poisoning
  description: >-
    Chronic lead poisoning results from sustained lower-level exposure with
    progressive neurocognitive effects, constipation, anemia, peripheral
    neuropathy, chronic kidney disease, and hypertension. Bone stores become a
    long-term endogenous reservoir for recurrent lead release.
  evidence:
  - reference: PMID:1030853
    reference_title: "Chronic industrial exposure to lead in 63 subjects. I. Clinical and erythrokinetic findings."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Clinical, biochemical, haematological and erythrokinetic studies were performed on 63 adult males with prolonged lead exposure."
    explanation: Supports chronic lead poisoning as a distinct syndrome of prolonged exposure with multisystem clinical findings.
pathophysiology:
- name: Lead absorption
  description: >-
    Lead enters the body through gastrointestinal and respiratory absorption.
  biological_processes:
  - preferred_term: transmembrane transport
    modifier: ABNORMAL
    term:
      id: GO:0055085
      label: transmembrane transport
  downstream:
  - target: Systemic lead distribution
    description: Absorbed lead enters the bloodstream and is distributed to soft tissues and bone.
    evidence:
    - reference: PMID:40981357
      reference_title: "The Mechanisms of Lead Toxicity in Living Organisms."
      supports: SUPPORT
      evidence_source: OTHER
      snippet: "Pb enters organisms through multiple pathways and causes severe health impacts across all biological systems, with particularly devastating neurodevelopmental and bone effects in children and cardiovascular and reproductive consequences in adults."
      explanation: Supports transition from lead entry into the body to systemic tissue exposure.
  evidence:
  - reference: PMID:40981357
    reference_title: "The Mechanisms of Lead Toxicity in Living Organisms."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Pb enters organisms through multiple pathways and causes severe health impacts across all biological systems, with particularly devastating neurodevelopmental and bone effects in children and cardiovascular and reproductive consequences in adults."
    explanation: Supports lead entry through multiple exposure pathways and its capacity to reach multiple organ systems.
- name: Systemic lead distribution
  description: >-
    Absorbed lead circulates systemically and persists in biologic tissues,
    allowing redistribution into bone, erythroid tissues, neurons, and kidney.
  downstream:
  - target: Bone sequestration of lead
    description: Systemically absorbed lead is progressively redistributed into bone stores.
    evidence:
    - reference: PMID:40981357
      reference_title: "The Mechanisms of Lead Toxicity in Living Organisms."
      supports: SUPPORT
      evidence_source: OTHER
      snippet: "The metal demonstrates remarkable persistence in biological systems, with approximately 90% of it stored in bone tissue for decades, mimicking calcium due to its similar ionic properties."
      explanation: Supports redistribution of absorbed lead into long-lived bone stores.
  - target: Inhibition of delta-aminolevulinic acid dehydratase
    description: Circulating lead reaches erythroid tissues and inhibits a key heme biosynthetic enzyme.
    evidence:
    - reference: PMID:3442386
      reference_title: "delta-Aminolevulinic acid dehydratase isozymes and lead toxicity."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "ALAD is a zinc metalloenzyme whose inhibition by lead is the first and most sensitive indicator of lead exposure and whose decreased activity has been implicated in the pathogenesis of lead poisoning."
      explanation: Supports direct inhibition of ALAD after lead exposure.
  - target: Calcium mimicry in neuronal signaling
    description: Lead acts as an ionic mimic of calcium in intracellular signaling pathways.
    evidence:
    - reference: PMID:8247416
      reference_title: "Evidence that lead acts as a calcium substitute in second messenger metabolism."
      supports: SUPPORT
      evidence_source: OTHER
      snippet: "Our investigations of the ability of lead to substitute for calcium in several intracellular regulatory events are reviewed in the context of the neurotoxicity produced by this heavy metal."
      explanation: Supports the transition from lead exposure to calcium-mimicry-mediated signaling disruption.
  - target: Proximal tubular lead accumulation
    description: Chronic systemic exposure leads to progressive renal cortical accumulation.
    evidence:
    - reference: PMID:2650022
      reference_title: "Mechanisms of lead and cadmium nephrotoxicity."
      supports: SUPPORT
      evidence_source: OTHER
      snippet: "Exposure to lead results in accumulation in proximal renal tubular lining cells in the form of morphologically discernible inclusion bodies which are lead-protein complexes."
      explanation: Supports proximal tubular accumulation as a direct downstream consequence of lead exposure.
  evidence:
  - reference: PMID:40981357
    reference_title: "The Mechanisms of Lead Toxicity in Living Organisms."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "The metal demonstrates remarkable persistence in biological systems, with approximately 90% of it stored in bone tissue for decades, mimicking calcium due to its similar ionic properties."
    explanation: Supports systemic persistence and redistribution of lead into long-lived tissue reservoirs.
- name: Bone sequestration of lead
  description: >-
    Most retained lead is deposited in bone, where it replaces calcium within
    mineralized tissue and serves as a long-term endogenous source of ongoing
    exposure during bone turnover.
  cell_types:
  - preferred_term: osteoblast
    term:
      id: CL:0000062
      label: osteoblast
  biological_processes:
  - preferred_term: calcium ion homeostasis
    modifier: ABNORMAL
    term:
      id: GO:0055074
      label: calcium ion homeostasis
  evidence:
  - reference: PMID:40981357
    reference_title: "The Mechanisms of Lead Toxicity in Living Organisms."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "The metal demonstrates remarkable persistence in biological systems, with approximately 90% of it stored in bone tissue for decades, mimicking calcium due to its similar ionic properties."
    explanation: Supports bone sequestration as a defining kinetic feature of lead poisoning.
  - reference: PMID:20643234
    reference_title: "The effect of lead on bone mineral properties from female adult C57/BL6 mice."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: "These data show that lead increases bone turnover resulting in weaker cortical bone in adult female mice and suggest that lead may exacerbate bone loss and osteoporosis in the elderly."
    explanation: Mouse data support direct adverse skeletal consequences of chronic bone lead deposition.
- name: Inhibition of delta-aminolevulinic acid dehydratase
  description: >-
    Lead inhibits delta-aminolevulinic acid dehydratase (ALAD), a zinc-dependent
    heme biosynthetic enzyme. This is an early and sensitive biochemical lesion
    of lead exposure and contributes to defective heme production.
  cell_types:
  - preferred_term: erythrocyte
    term:
      id: CL:0000232
      label: erythrocyte
  biological_processes:
  - preferred_term: heme biosynthetic process
    modifier: DECREASED
    term:
      id: GO:0006783
      label: heme biosynthetic process
  downstream:
  - target: Anemia
    description: Impaired heme synthesis contributes to reduced erythrocyte function and clinical anemia.
    evidence:
    - reference: PMID:3442386
      reference_title: "delta-Aminolevulinic acid dehydratase isozymes and lead toxicity."
      supports: PARTIAL
      evidence_source: HUMAN_CLINICAL
      snippet: "ALAD is a zinc metalloenzyme whose inhibition by lead is the first and most sensitive indicator of lead exposure and whose decreased activity has been implicated in the pathogenesis of lead poisoning."
      explanation: Supports defective heme biosynthesis as a core pathogenic lesion that contributes to lead-associated anemia.
    - reference: PMID:33505133
      reference_title: "Activated Carbon Fabric Mask Reduces Lead Absorption and Improves the Heme Biosynthesis and Hematological Parameters of Battery Manufacturing Workers."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Two months using ACF mask reduces the blood lead level and improves the δ-ALDH activity and hematological parameters, decreases the urinary excretion of δ-ALA, PBG of battery manufacturing workers."
      explanation: Human worker data support a downstream relationship between recovery of ALAD-linked heme biosynthesis and improvement in hematologic parameters, consistent with ALAD inhibition contributing to anemia.
  evidence:
  - reference: PMID:3442386
    reference_title: "delta-Aminolevulinic acid dehydratase isozymes and lead toxicity."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "ALAD is a zinc metalloenzyme whose inhibition by lead is the first and most sensitive indicator of lead exposure and whose decreased activity has been implicated in the pathogenesis of lead poisoning."
    explanation: Directly supports ALAD inhibition as a central biochemical mechanism in lead toxicity.
- name: Erythrocyte pyrimidine 5'-nucleotidase deficiency
  description: >-
    Lead intoxication causes an acquired erythrocyte pyrimidine 5'-nucleotidase
    deficiency, leading to abnormal pyrimidine nucleotide handling and
    basophilic stippling.
  cell_types:
  - preferred_term: erythrocyte
    term:
      id: CL:0000232
      label: erythrocyte
  biological_processes:
  - preferred_term: pyrimidine-containing compound biosynthetic process
    modifier: ABNORMAL
    term:
      id: GO:0072528
      label: pyrimidine-containing compound biosynthetic process
  downstream:
  - target: Hemolytic erythrocyte injury
    description: Lead-induced erythrocyte enzyme dysfunction contributes to downstream hemolytic injury.
    evidence:
    - reference: PMID:965496
      reference_title: "Lead poisoning: association with hemolytic anemia, basophilic stippling, erythrocyte pyrimidine 5'-nucleotidase deficiency, and intraerythrocytic accumulation of pyrimidines."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "The findings indicate that the hemolytic anemia and increased basophilic stippling characteristic of certain cases of lead intoxication may share a common etiology with essentially identical features of the genetically determined disorder."
      explanation: Supports a downstream relationship between pyrimidine 5'-nucleotidase deficiency and hemolytic erythrocyte injury.
  evidence:
  - reference: PMID:965496
    reference_title: "Lead poisoning: association with hemolytic anemia, basophilic stippling, erythrocyte pyrimidine 5'-nucleotidase deficiency, and intraerythrocytic accumulation of pyrimidines."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Lead intoxication is accompanied by an acquired deficiency of erythrocyte pryimidine-specific, 5'-nucleotidase."
    explanation: Supports lead-induced erythrocyte enzymatic injury as a mechanism of hematologic toxicity.
- name: Hemolytic erythrocyte injury
  description: >-
    Lead-associated erythrocyte injury increases hemolysis and contributes to
    clinically significant anemia.
  cell_types:
  - preferred_term: erythrocyte
    term:
      id: CL:0000232
      label: erythrocyte
  downstream:
  - target: Anemia
    description: Hemolytic erythrocyte injury contributes to hemolytic anemia in lead intoxication.
    evidence:
    - reference: PMID:965496
      reference_title: "Lead poisoning: association with hemolytic anemia, basophilic stippling, erythrocyte pyrimidine 5'-nucleotidase deficiency, and intraerythrocytic accumulation of pyrimidines."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "The findings indicate that the hemolytic anemia and increased basophilic stippling characteristic of certain cases of lead intoxication may share a common etiology with essentially identical features of the genetically determined disorder."
      explanation: Directly supports hemolytic erythrocyte injury as a downstream cause of anemia in lead intoxication.
  evidence:
  - reference: PMID:965496
    reference_title: "Lead poisoning: association with hemolytic anemia, basophilic stippling, erythrocyte pyrimidine 5'-nucleotidase deficiency, and intraerythrocytic accumulation of pyrimidines."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The findings indicate that the hemolytic anemia and increased basophilic stippling characteristic of certain cases of lead intoxication may share a common etiology with essentially identical features of the genetically determined disorder."
    explanation: Supports hemolytic erythrocyte injury as a distinct hematologic event in lead intoxication.
- name: Calcium mimicry in neuronal signaling
  description: >-
    Lead acts as a calcium substitute in intracellular signaling, perturbing
    calcium-dependent neuronal regulatory pathways.
  cell_types:
  - preferred_term: neuron
    term:
      id: CL:0000540
      label: neuron
  biological_processes:
  - preferred_term: calcium ion homeostasis
    modifier: ABNORMAL
    term:
      id: GO:0055074
      label: calcium ion homeostasis
  downstream:
  - target: Protein kinase C dysregulation
    description: Lead substitution for calcium perturbs second-messenger signaling and promotes downstream protein kinase C dysregulation.
    evidence:
    - reference: PMID:8247416
      reference_title: "Evidence that lead acts as a calcium substitute in second messenger metabolism."
      supports: SUPPORT
      evidence_source: OTHER
      snippet: "Taken together these studies implicate second messenger metabolism and protein kinase activation as potential sites for the disruptive action of lead upon nervous system function."
      explanation: Supports downstream protein kinase C dysregulation after lead-induced disturbance of calcium-dependent intracellular signaling.
  evidence:
  - reference: PMID:8247416
    reference_title: "Evidence that lead acts as a calcium substitute in second messenger metabolism."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Our investigations of the ability of lead to substitute for calcium in several intracellular regulatory events are reviewed in the context of the neurotoxicity produced by this heavy metal."
    explanation: Supports calcium mimicry as a distinct upstream mechanism of lead neurotoxicity.
- name: Protein kinase C dysregulation
  description: >-
    Lead-induced disturbance of second-messenger signaling alters protein
    kinase C activation and other calcium-regulated neuronal signaling outputs.
  cell_types:
  - preferred_term: neuron
    term:
      id: CL:0000540
      label: neuron
  downstream:
  - target: Cognitive impairment
    description: Dysregulated neuronal signaling contributes to impaired cognition and neurodevelopment.
    evidence:
    - reference: PMID:28889260
      reference_title: "Developmental Neurotoxicity of Lead."
      supports: PARTIAL
      evidence_source: OTHER
      snippet: "In utero and early life exposures to lead have been associated with lower IQ, antisocial and delinquent behaviors, and attention-deficit hyperactivity disorder."
      explanation: Supports cognitive impairment as a downstream clinical manifestation of lead neurotoxicity, although the abstract does not isolate protein kinase C signaling specifically.
    - reference: PMID:10215516
      reference_title: "Protein kinase C in rat brain is altered by developmental lead exposure."
      supports: SUPPORT
      evidence_source: MODEL_ORGANISM
      snippet: "The absence of learning-related redistribution of hippocampal protein kinase C (PKC) has been correlated with impairment of learning performance induced by developmental lead (Pb) exposure."
      explanation: Rat data directly support a downstream link between lead-induced PKC dysregulation and impaired learning performance.
    - reference: PMID:9559103
      reference_title: "Developmental lead exposure alters the distribution of protein kinase C activity in the rat hippocampus."
      supports: SUPPORT
      evidence_source: MODEL_ORGANISM
      snippet: "This study indicates that chronic Pb exposure during development influences hippocampal PKC activity and distribution. These changes may be involved in the subclinical neurotoxicity of chronic Pb exposure in young children."
      explanation: Independent developmental rat data support abnormal hippocampal PKC signaling as a mechanism contributing to downstream neurocognitive toxicity.
  evidence:
  - reference: PMID:8247416
    reference_title: "Evidence that lead acts as a calcium substitute in second messenger metabolism."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Taken together these studies implicate second messenger metabolism and protein kinase activation as potential sites for the disruptive action of lead upon nervous system function."
    explanation: Supports protein kinase activation dysregulation as a distinct downstream neuronal signaling event in lead toxicity.
- name: Mitochondrial dysfunction
  description: >-
    Lead poisoning perturbs mitochondrial function across multiple organ
    systems, contributing to cellular energy failure and tissue injury.
  biological_processes:
  - preferred_term: mitochondrion organization
    modifier: ABNORMAL
    term:
      id: GO:0007005
      label: mitochondrion organization
  evidence:
  - reference: PMID:40981357
    reference_title: "The Mechanisms of Lead Toxicity in Living Organisms."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "On a molecular level, Pb disrupts cellular processes through ion mimicry, replacing essential metals in enzymes and proteins and leading to mitochondrial dysfunction, oxidative stress, DNA damage, and epigenetic modifications."
    explanation: Supports mitochondrial dysfunction as a distinct downstream mechanism of lead toxicity.
- name: Oxidative stress response
  description: >-
    Lead exposure increases oxidative stress signaling and contributes to
    multisystem cellular injury.
  biological_processes:
  - preferred_term: response to oxidative stress
    modifier: INCREASED
    term:
      id: GO:0006979
      label: response to oxidative stress
  evidence:
  - reference: PMID:40981357
    reference_title: "The Mechanisms of Lead Toxicity in Living Organisms."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "On a molecular level, Pb disrupts cellular processes through ion mimicry, replacing essential metals in enzymes and proteins and leading to mitochondrial dysfunction, oxidative stress, DNA damage, and epigenetic modifications."
    explanation: Supports oxidative stress as a distinct downstream mechanism of lead toxicity.
- name: Proximal tubular lead accumulation
  description: >-
    Lead accumulates in proximal renal tubular cells, where it forms inclusion
    bodies and produces potentially reversible proximal tubular dysfunction in
    acute toxicity.
  cell_types:
  - preferred_term: proximal tubule cell
    term:
      id: CL:0002306
      label: epithelial cell of proximal tubule
  biological_processes:
  - preferred_term: renal absorption
    modifier: ABNORMAL
    term:
      id: GO:0070293
      label: renal absorption
  downstream:
  - target: Chronic tubulointerstitial nephropathy
    description: Persistent proximal tubular lead injury progresses to chronic tubulointerstitial renal disease.
    evidence:
    - reference: PMID:9300927
      reference_title: "Renal effects of environmental and occupational lead exposure."
      supports: SUPPORT
      evidence_source: OTHER
      snippet: "Chronic occupational exposure to lead, or consumption of illicit alcohol adulterated with lead, has also been linked to a high incidence of renal dysfunction, which is characterized by glomerular and tubulointerstitial changes resulting in chronic renal failure, hypertension, hyperuricemia, and gout."
      explanation: Supports chronic tubulointerstitial renal disease as a downstream outcome of persistent lead-related renal injury.
  evidence:
  - reference: PMID:2650022
    reference_title: "Mechanisms of lead and cadmium nephrotoxicity."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Exposure to lead results in accumulation in proximal renal tubular lining cells in the form of morphologically discernible inclusion bodies which are lead-protein complexes."
    explanation: Supports proximal tubular accumulation as the initial renal lesion of lead nephrotoxicity.
  - reference: PMID:2650022
    reference_title: "Mechanisms of lead and cadmium nephrotoxicity."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Acute nephrotoxicity consists of proximal tubular dysfunction and can be reversed by treatment with chelating agents."
    explanation: Supports proximal tubular dysfunction as the dominant acute renal consequence of lead accumulation.
- name: Chronic tubulointerstitial nephropathy
  description: >-
    Chronic lead nephrotoxicity is a tubulointerstitial renal disease marked by
    interstitial fibrosis, progressive nephron loss, and associated
    hyperuricemia, gout, and hypertension.
  cell_types:
  - preferred_term: proximal tubule cell
    term:
      id: CL:0002306
      label: epithelial cell of proximal tubule
  downstream:
  - target: Chronic kidney disease
    description: Progressive nephron loss in chronic lead nephropathy produces persistent chronic kidney disease.
    evidence:
    - reference: PMID:9300927
      reference_title: "Renal effects of environmental and occupational lead exposure."
      supports: SUPPORT
      evidence_source: OTHER
      snippet: "Chronic occupational exposure to lead, or consumption of illicit alcohol adulterated with lead, has also been linked to a high incidence of renal dysfunction, which is characterized by glomerular and tubulointerstitial changes resulting in chronic renal failure, hypertension, hyperuricemia, and gout."
      explanation: Supports chronic kidney disease as a downstream consequence of chronic lead nephropathy.
  - target: Gout
    description: Lead-related renal dysfunction promotes hyperuricemia and gout.
    evidence:
    - reference: PMID:8475950
      reference_title: "Lead nephropathy, gout, and hypertension."
      supports: SUPPORT
      evidence_source: OTHER
      snippet: "Renal function and biopsy studies showed that lead nephropathy is a chronic tubulointerstitial renal disease with modest proteinuria which frequently presents with hyperuricemia, gout and hypertension."
      explanation: Directly supports gout as a downstream clinical consequence of chronic lead nephropathy.
  - target: Hypertension
    description: Chronic lead nephropathy frequently presents with hypertension.
    evidence:
    - reference: PMID:8475950
      reference_title: "Lead nephropathy, gout, and hypertension."
      supports: SUPPORT
      evidence_source: OTHER
      snippet: "Renal function and biopsy studies showed that lead nephropathy is a chronic tubulointerstitial renal disease with modest proteinuria which frequently presents with hyperuricemia, gout and hypertension."
      explanation: Directly supports hypertension as a downstream clinical consequence of chronic lead nephropathy.
  evidence:
  - reference: PMID:2650022
    reference_title: "Mechanisms of lead and cadmium nephrotoxicity."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Chronic lead nephrotoxicity consists of interstitial fibrosis and progressive nephron loss, azotaemia and renal failure. Potential complications of lead nephropathy include gout and hypertension."
    explanation: Supports the chronic fibrosing renal phenotype and its hypertensive complication.
  - reference: PMID:8475950
    reference_title: "Lead nephropathy, gout, and hypertension."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Renal function and biopsy studies showed that lead nephropathy is a chronic tubulointerstitial renal disease with modest proteinuria which frequently presents with hyperuricemia, gout and hypertension."
    explanation: Confirms the clinical pattern of chronic tubulointerstitial nephropathy in lead poisoning.
phenotypes:
- category: Gastrointestinal
  name: Abdominal pain
  frequency: FREQUENT
  description: >-
    Cramping abdominal pain or lead colic, particularly in more symptomatic
    acute or chronic intoxication.
  phenotype_term:
    preferred_term: abdominal pain
    term:
      id: HP:0002027
      label: Abdominal pain
  evidence:
  - reference: PMID:17405745
    reference_title: "Anaemia and abdominal pain due to occupational lead poisoning."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We describe a 47-year-old patient with chronic anaemia with basophilic stippling of erythrocytes, recurrent abdominal colics, discoloration of gums, sensitive polyneuropathy to the four limbs, hyperuricaemia, hepatosteatosis with raised transaminases, and a long ignored history of lead exposure in a battery recycling plant."
    explanation: Direct human case evidence supports recurrent abdominal colic as a characteristic manifestation of lead poisoning.
- category: Gastrointestinal
  name: Constipation
  frequency: FREQUENT
  description: >-
    Reduced bowel motility and constipation are common gastrointestinal
    manifestations of lead toxicity.
  phenotype_term:
    preferred_term: constipation
    term:
      id: HP:0002019
      label: Constipation
  evidence:
  - reference: PMID:29531415
    reference_title: "Lead poisoning outbreak among opium users in the Islamic Republic of Iran, 2016-2017."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "In February 2016, we noticed a steep increase in the numbers of oral opium users referred to our poison treatment centre with abdominal pain, anaemia and constipation."
    explanation: Outbreak data provide direct human clinical support for constipation as a common presenting feature of lead poisoning.
- category: Hematologic
  name: Anemia
  frequency: FREQUENT
  description: >-
    Lead poisoning causes anemia through impaired heme synthesis and, in some
    cases, hemolytic injury.
  phenotype_term:
    preferred_term: anemia
    term:
      id: HP:0001903
      label: Anemia
  evidence:
  - reference: PMID:37478813
    reference_title: "Trends in Blood Lead Levels Quantified by ICP-MS: A Reference Laboratory Retrospective Study."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Exposure to lead may cause severe adverse effects such as anemia, neurologic damage, developmental disorders, and reproductive disorders."
    explanation: Supports anemia as a major adverse clinical effect of lead exposure.
  - reference: PMID:965496
    reference_title: "Lead poisoning: association with hemolytic anemia, basophilic stippling, erythrocyte pyrimidine 5'-nucleotidase deficiency, and intraerythrocytic accumulation of pyrimidines."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The findings indicate that the hemolytic anemia and increased basophilic stippling characteristic of certain cases of lead intoxication may share a common etiology with essentially identical features of the genetically determined disorder."
    explanation: Supports hemolytic anemia as a clinically important hematologic manifestation of lead intoxication.
- category: Nervous System
  name: Encephalopathy
  frequency: OCCASIONAL
  description: >-
    Severe acute lead poisoning, especially in children, can cause life-
    threatening lead encephalopathy with seizures, altered mental status, and
    raised intracranial pressure.
  phenotype_term:
    preferred_term: encephalopathy
    term:
      id: HP:0001298
      label: Encephalopathy
  evidence:
  - reference: PMID:29523605
    reference_title: "Lead in a case of encephalopathy."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "A 2-year-old boy with a history of pica was admitted with vomiting and treated overnight for viral tonsillitis. A week later, he presented with a prolonged afebrile seizure and required intubation and ventilation."
    explanation: Direct human case evidence supports severe childhood lead encephalopathy with seizure and critical neurologic deterioration.
- category: Nervous System
  name: Cognitive impairment
  frequency: FREQUENT
  description: >-
    Lead exposure, especially during development, is associated with lasting
    impairment in cognition and intellectual function.
  phenotype_term:
    preferred_term: cognitive impairment
    term:
      id: HP:0100543
      label: Cognitive impairment
  evidence:
  - reference: PMID:28889260
    reference_title: "Developmental Neurotoxicity of Lead."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "In utero and early life exposures to lead have been associated with lower IQ, antisocial and delinquent behaviors, and attention-deficit hyperactivity disorder."
    explanation: Supports cognitive and neurobehavioral impairment as a major consequence of developmental lead exposure.
- category: Nervous System
  name: Developmental delay
  frequency: FREQUENT
  description: >-
    Early-life lead exposure disrupts neurodevelopment and is associated with
    developmental delay and broader developmental disorders in children.
  phenotype_term:
    preferred_term: developmental delay
    term:
      id: HP:0001263
      label: Global developmental delay
  evidence:
  - reference: PMID:37478813
    reference_title: "Trends in Blood Lead Levels Quantified by ICP-MS: A Reference Laboratory Retrospective Study."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Exposure to lead may cause severe adverse effects such as anemia, neurologic damage, developmental disorders, and reproductive disorders."
    explanation: Supports developmental delay and related developmental disorders as major pediatric consequences of lead exposure.
- category: Nervous System
  name: Behavioral changes
  frequency: OCCASIONAL
  description: >-
    Developmental lead exposure is associated with behavioral abnormalities,
    including attention-related and antisocial behavioral changes.
  phenotype_term:
    preferred_term: behavioral changes
    term:
      id: HP:0000708
      label: Atypical behavior
  evidence:
  - reference: PMID:28889260
    reference_title: "Developmental Neurotoxicity of Lead."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "In utero and early life exposures to lead have been associated with lower IQ, antisocial and delinquent behaviors, and attention-deficit hyperactivity disorder."
    explanation: Supports behaviorally abnormal neurodevelopmental outcomes as a clinically important consequence of developmental lead exposure.
- category: Nervous System
  name: Peripheral neuropathy
  frequency: OCCASIONAL
  description: >-
    Lead neuropathy is classically motor-predominant and may present with wrist
    drop or radial palsy.
  phenotype_term:
    preferred_term: peripheral neuropathy
    term:
      id: HP:0009830
      label: Peripheral neuropathy
  evidence:
  - reference: PMID:17405745
    reference_title: "Anaemia and abdominal pain due to occupational lead poisoning."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We describe a 47-year-old patient with chronic anaemia with basophilic stippling of erythrocytes, recurrent abdominal colics, discoloration of gums, sensitive polyneuropathy to the four limbs, hyperuricaemia, hepatosteatosis with raised transaminases, and a long ignored history of lead exposure in a battery recycling plant."
    explanation: Direct human case evidence supports peripheral polyneuropathy as a neurologic manifestation of lead toxicity.
  - reference: PMID:20142857
    reference_title: "Radial neuropathy due to occupational lead exposure: Phenotypic and electrophysiological characteristics of five patients."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Neuropathy is one complication of lead poisoning."
    explanation: Supports lead neuropathy, including occupational radial neuropathy, as a recognized complication of lead poisoning.
- category: Cardiovascular
  name: Hypertension
  frequency: OCCASIONAL
  description: >-
    Chronic lead nephropathy and persistent lead burden are associated with
    systemic hypertension.
  phenotype_term:
    preferred_term: hypertension
    term:
      id: HP:0000822
      label: Hypertension
  evidence:
  - reference: PMID:8475950
    reference_title: "Lead nephropathy, gout, and hypertension."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Renal function and biopsy studies showed that lead nephropathy is a chronic tubulointerstitial renal disease with modest proteinuria which frequently presents with hyperuricemia, gout and hypertension."
    explanation: Supports hypertension as a common complication of chronic lead nephropathy.
- category: Renal
  name: Chronic kidney disease
  frequency: OCCASIONAL
  description: >-
    Chronic occupational or environmental lead exposure can produce
    progressive chronic kidney disease through tubulointerstitial nephropathy.
  phenotype_term:
    preferred_term: chronic kidney disease
    term:
      id: HP:0012622
      label: Chronic kidney disease
  evidence:
  - reference: PMID:9300927
    reference_title: "Renal effects of environmental and occupational lead exposure."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Chronic occupational exposure to lead, or consumption of illicit alcohol adulterated with lead, has also been linked to a high incidence of renal dysfunction, which is characterized by glomerular and tubulointerstitial changes resulting in chronic renal failure, hypertension, hyperuricemia, and gout."
    explanation: Supports chronic kidney disease as a clinically important manifestation of chronic lead nephrotoxicity.
- category: Metabolic
  name: Gout
  frequency: OCCASIONAL
  description: >-
    Chronic lead nephropathy can impair urate handling and contribute to gout.
  phenotype_term:
    preferred_term: gout
    term:
      id: HP:0001997
      label: Gout
  evidence:
  - reference: PMID:8475950
    reference_title: "Lead nephropathy, gout, and hypertension."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Renal function and biopsy studies showed that lead nephropathy is a chronic tubulointerstitial renal disease with modest proteinuria which frequently presents with hyperuricemia, gout and hypertension."
    explanation: Supports gout as a recognized metabolic complication of chronic lead nephropathy.
- category: Oral
  name: Gingival lead line
  frequency: OCCASIONAL
  description: >-
    Burton line or lead-line gingival discoloration is a classic oral finding
    in chronic lead poisoning.
  phenotype_term:
    preferred_term: gingival lead line
    term:
      id: HP:0000168
      label: Abnormality of the gingiva
  evidence:
  - reference: PMID:6943483
    reference_title: "Gingival pigmentation as the sole presenting sign of chronic lead poisoning in a mentally retarded adult."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "A diagnosis of chronic lead poisoning in a mentally retarded adult with pica was initially proposed because of the presence of a \"lead line\" on the patient's gingiva."
    explanation: Direct human clinical evidence supports Burton-line gingival changes as a classic physical finding in chronic lead poisoning.
histopathology:
- name: Basophilic stippling of erythrocytes
  description: >-
    Peripheral blood smear may show basophilic stippling of red blood cells
    due to aggregated ribosomes in lead intoxication. This is a classic but
    nonspecific microscopic finding.
  context: Peripheral blood smear in lead intoxication
  diagnostic: false
  evidence:
  - reference: PMID:6202140
    reference_title: "Basophilic stippling of red blood cells: a nonspecific finding of multiple etiology."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Basophilic stippling of red blood cells (BSC) has been noted in lead intoxication since 1899 and has been considered a classic laboratory sign of lead poisoning since that time."
    explanation: Supports basophilic stippling as the classic hematologic microscopic finding in lead poisoning.
  - reference: PMID:1030853
    reference_title: "Chronic industrial exposure to lead in 63 subjects. I. Clinical and erythrokinetic findings."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Other associated findings were: higher reticulocyte counts and more basophilic stippling of the RBCs, more sideroblasts and greater erythroid hyperplasia of the bone marrow"
    explanation: Supports basophilic stippling as an observed microscopic feature in chronically lead-exposed patients.
  notes: Basophilic stippling is supportive but not specific for lead poisoning.
- name: Proximal tubular nuclear inclusion bodies
  description: >-
    Early lead nephropathy is characterized by proximal tubular nuclear
    inclusion bodies formed by lead-protein complexes, alongside chronic
    tubulointerstitial disease and fibrosis.
  context: Renal biopsy in lead nephropathy
  diagnostic: true
  evidence:
  - reference: PMID:2650022
    reference_title: "Mechanisms of lead and cadmium nephrotoxicity."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Exposure to lead results in accumulation in proximal renal tubular lining cells in the form of morphologically discernible inclusion bodies which are lead-protein complexes."
    explanation: Supports proximal tubular nuclear inclusion bodies as a characteristic microscopic renal lesion in lead nephrotoxicity.
  - reference: PMID:19106433
    reference_title: "Nephrotoxicity of cadmium & lead."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "both entities are characterized by tubulointerstitial disease and fibrosis, but only early lead nephropathy is characterized by the presence of proximal tubule nuclear inclusion bodies, due to the combination of lead with a lead binding-protein."
    explanation: Distinguishes lead nephropathy histopathology from cadmium nephropathy by the presence of proximal tubular nuclear inclusion bodies.
biochemical:
- name: Blood Lead Level
  presence: INCREASED
  notes: >-
    Venous whole-blood lead measurement is the primary laboratory test for
    confirming exposure and guiding intervention thresholds.
  evidence:
  - reference: PMID:37478813
    reference_title: "Trends in Blood Lead Levels Quantified by ICP-MS: A Reference Laboratory Retrospective Study."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Consequently, in 2021, the Centers for Disease Control and Prevention (CDC) reduced its blood lead reference value from 5 µg/dL to 3.5 µg/dL in pediatric patients, 1 to 5 years old."
    explanation: Supports blood lead concentration as the central biomarker for diagnosis and public-health intervention.
- name: Zinc Protoporphyrin
  presence: INCREASED
  notes: >-
    Zinc protoporphyrin is an adjunct biomarker of disrupted heme synthesis and
    has been used for biologic monitoring of lead exposure.
  evidence:
  - reference: PMID:6202140
    reference_title: "Basophilic stippling of red blood cells: a nonspecific finding of multiple etiology."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Furthermore, BSC has been replaced by blood lead (since the 1940s) and zinc protoporphyrin (since the 1970s) levels for biologic monitoring of lead-exposed workers."
    explanation: Supports zinc protoporphyrin as a laboratory biomarker used in monitoring lead exposure.
environmental:
- name: Lead-based paint
  exposure_term:
    preferred_term: exposure to lead
    term:
      id: ECTO:9000945
      label: exposure to lead
  environment_context:
    preferred_term: lead paint
    term:
      id: ENVO:02000124
      label: lead paint
  description: >-
    Deteriorating lead-based paint remains a major pediatric exposure source,
    especially where older housing stock is present.
  evidence:
  - reference: PMID:28889260
    reference_title: "Developmental Neurotoxicity of Lead."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Environmental exposures to lead, predominantly from contaminated water or lead paint chips, account for the majority of exposures to children."
    explanation: Supports lead paint as a major pediatric exposure source.
- name: Household dust
  exposure_term:
    preferred_term: exposure to lead
    term:
      id: ECTO:9000945
      label: exposure to lead
  environment_context:
    preferred_term: household dust
    term:
      id: ENVO:00002008
      label: dust
  description: >-
    Contaminated household dust is an important secondary exposure source for
    children, especially in homes with legacy lead contamination.
  evidence:
  - reference: PMID:32651990
    reference_title: "Contribution of house dust contamination towards lead exposure among children in Karachi, Pakistan."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Thus, house dust is an important source of lead exposure in Pakistani children."
    explanation: Direct human exposure data support contaminated household dust as a meaningful pediatric lead source.
- name: Contaminated drinking water
  exposure_term:
    preferred_term: exposure to lead in water via ingestion
    term:
      id: ECTO:0080003
      label: exposure to lead in water via ingestion
  environment_context:
    preferred_term: drinking water
    term:
      id: ENVO:00003064
      label: drinking water
  description: >-
    Lead in drinking water from aging infrastructure remains an important source
    of environmental exposure.
  evidence:
  - reference: PMID:28889260
    reference_title: "Developmental Neurotoxicity of Lead."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Environmental exposures to lead, predominantly from contaminated water or lead paint chips, account for the majority of exposures to children."
    explanation: Supports contaminated water as a major exposure source.
- name: Contaminated spices and turmeric
  exposure_term:
    preferred_term: exposure to lead
    term:
      id: ECTO:9000945
      label: exposure to lead
  description: >-
    Lead-contaminated food products, especially locally sourced spices and
    turmeric, can materially increase blood lead levels in children.
  evidence:
  - reference: PMID:36962532
    reference_title: "Prevalence of elevated blood lead levels and risk factors among children living in Patna, Bihar, India 2020."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Children in Patna, Bihar, India are exposed to multiple sources of lead, with lead levels in house dust and loose, locally sourced spices the most likely to increase blood lead levels."
    explanation: Direct pediatric exposure data support contaminated spices as a foodborne source of lead exposure.
- name: Lead-soldered food and drink cans
  exposure_term:
    preferred_term: exposure to lead
    term:
      id: ECTO:9000945
      label: exposure to lead
  description: >-
    Historically, lead-soldered food and drink cans were an important dietary
    exposure source before population-level control efforts reduced this route.
  evidence:
  - reference: PMID:9799191
    reference_title: "Exposure of the U.S. population to lead, 1991-1994."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Public health efforts have been successful in removing lead from population-wide sources such as gasoline and lead-soldered food and drink cans, but new efforts must address the difficult problem of leaded paint, especially in older houses, as well as lead in dust and soil."
    explanation: Supports lead-soldered food and drink cans as a recognized historical food-related source of lead exposure.
- name: Battery manufacture
  exposure_term:
    preferred_term: exposure to lead
    term:
      id: ECTO:9000945
      label: exposure to lead
  description: >-
    Occupational and para-occupational lead exposure occurs in battery
    manufacture and related industrial handling.
  evidence:
  - reference: PMID:40981357
    reference_title: "The Mechanisms of Lead Toxicity in Living Organisms."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Contemporary contamination primarily stems from mining activities, battery manufacturing, electronic waste recycling, and deteriorating infrastructure."
    explanation: Supports battery manufacturing as a contemporary industrial exposure source for lead poisoning.
- name: Mining
  exposure_term:
    preferred_term: exposure to lead
    term:
      id: ECTO:9000945
      label: exposure to lead
  description: >-
    Mining activities remain an important occupational and community source of
    lead contamination and exposure.
  evidence:
  - reference: PMID:40981357
    reference_title: "The Mechanisms of Lead Toxicity in Living Organisms."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Contemporary contamination primarily stems from mining activities, battery manufacturing, electronic waste recycling, and deteriorating infrastructure."
    explanation: Supports mining activities as a contemporary source of lead exposure.
- name: E-waste recycling
  exposure_term:
    preferred_term: exposure to lead
    term:
      id: ECTO:9000945
      label: exposure to lead
  environment_context:
    preferred_term: electronic waste material
    term:
      id: ENVO:00002264
      label: waste material
  description: >-
    Electronic waste recycling is an important contemporary source of lead
    exposure through handling and processing of contaminated materials.
  evidence:
  - reference: PMID:40981357
    reference_title: "The Mechanisms of Lead Toxicity in Living Organisms."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Contemporary contamination primarily stems from mining activities, battery manufacturing, electronic waste recycling, and deteriorating infrastructure."
    explanation: Supports electronic waste recycling as a contemporary source of lead exposure.
- name: Lead-adulterated oral opium
  exposure_term:
    preferred_term: exposure to lead
    term:
      id: ECTO:9000945
      label: exposure to lead
  description: >-
    Illicit oral opium contaminated with lead can cause major community
    outbreaks of lead poisoning, especially with chronic use.
  evidence:
  - reference: PMID:29531415
    reference_title: "Lead poisoning outbreak among opium users in the Islamic Republic of Iran, 2016-2017."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Lead-contaminated opium and heroin that has transited through the Iranian markets is a global risk and highlights a need for better monitoring of illegal drug supplies."
    explanation: Supports adulterated oral opium as a documented non-occupational source of lead poisoning.
  - reference: PMID:29531415
    reference_title: "Lead poisoning outbreak among opium users in the Islamic Republic of Iran, 2016-2017."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Analysis of an illegal opium sample showed 3.55 mg lead in 1 g opium."
    explanation: Directly demonstrates lead contamination of illicit opium as the proximate exposure source in a large outbreak.
- name: Lead-adulterated heroin
  exposure_term:
    preferred_term: exposure to lead
    term:
      id: ECTO:9000945
      label: exposure to lead
  description: >-
    Illicit heroin contaminated with lead is a documented non-occupational
    exposure source that can contribute to community lead poisoning.
  evidence:
  - reference: PMID:29531415
    reference_title: "Lead poisoning outbreak among opium users in the Islamic Republic of Iran, 2016-2017."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Lead-contaminated opium and heroin that has transited through the Iranian markets is a global risk and highlights a need for better monitoring of illegal drug supplies."
    explanation: Supports adulterated heroin as a documented non-occupational source of lead poisoning.
treatments:
- name: Exposure cessation and source control
  description: >-
    The first intervention is removal from the lead source and prevention of
    ongoing exposure.
  treatment_term:
    preferred_term: supportive care
    term:
      id: MAXO:0000950
      label: supportive care
  target_mechanisms:
  - target: Lead absorption
    treatment_effect: INHIBITS
    description: Source control prevents continued lead entry and lowers ongoing systemic burden.
    evidence:
    - reference: PMID:8475950
      reference_title: "Lead nephropathy, gout, and hypertension."
      supports: SUPPORT
      evidence_source: OTHER
      snippet: "While chelation therapy is safe and helpful in reversing early lead nephropathy, the best treatment is prevention."
      explanation: Supports exposure prevention as the primary intervention that blocks continued toxic lead burden.
  evidence:
  - reference: PMID:8475950
    reference_title: "Lead nephropathy, gout, and hypertension."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "While chelation therapy is safe and helpful in reversing early lead nephropathy, the best treatment is prevention."
    explanation: Supports exposure prevention and source removal as the foundational management strategy.
- name: Succimer chelation
  description: >-
    Oral succimer is used as a lead chelator, particularly in children with
    elevated blood lead concentrations.
  treatment_term:
    preferred_term: chelator agent therapy
    term:
      id: MAXO:0001223
      label: chelator agent therapy
    qualifiers:
    - predicate:
        preferred_term: therapeutic agent
        term:
          id: NCIT:C2259
          label: Therapeutic Agent
      value:
        preferred_term: succimer
        term:
          id: CHEBI:63623
          label: succimer
  target_mechanisms:
  - target: Systemic lead distribution
    treatment_effect: INHIBITS
    description: Succimer lowers circulating and soft-tissue lead burden by forming excretable complexes with lead.
    evidence:
    - reference: PMID:1663439
      reference_title: "Succimer, an oral lead chelator."
      supports: SUPPORT
      evidence_source: OTHER
      snippet: "Succimer is an orally active, heavy-metal chelating agent that forms stable, water-soluble complexes with lead; it also chelates other toxic heavy metals, such as arsenic and mercury."
      explanation: Directly supports chelation of systemic lead as the proximate treatment mechanism of succimer.
  evidence:
  - reference: PMID:1663439
    reference_title: "Succimer, an oral lead chelator."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "It is a designated orphan drug that is indicated for the treatment of lead poisoning, specifically in children with blood lead concentrations higher than 45 micrograms/dL."
    explanation: Directly supports succimer as an indicated chelation therapy for pediatric lead poisoning.
- name: Calcium disodium edetate chelation
  description: >-
    Calcium disodium EDTA chelation is used in selected patients with
    significant body lead burden, particularly when nephropathy is present.
  treatment_term:
    preferred_term: chelator agent therapy
    term:
      id: MAXO:0001223
      label: chelator agent therapy
    qualifiers:
    - predicate:
        preferred_term: therapeutic agent
        term:
          id: NCIT:C2259
          label: Therapeutic Agent
      value:
        preferred_term: edetic acid
        term:
          id: NCIT:C61742
          label: Edetic Acid
  evidence:
  - reference: PMID:8475950
    reference_title: "Lead nephropathy, gout, and hypertension."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "While chelation therapy is safe and helpful in reversing early lead nephropathy, the best treatment is prevention."
    explanation: Supports chelation therapy, including EDTA-based approaches discussed in lead nephropathy, as helpful in early disease.
- name: Dimercaprol chelation
  description: >-
    Dimercaprol is used with calcium disodium EDTA in more severely intoxicated
    patients, including severe acute lead poisoning and lead encephalopathy.
  treatment_term:
    preferred_term: chelator agent therapy
    term:
      id: MAXO:0001223
      label: chelator agent therapy
    qualifiers:
    - predicate:
        preferred_term: therapeutic agent
        term:
          id: NCIT:C2259
          label: Therapeutic Agent
      value:
        preferred_term: dimercaprol
        term:
          id: CHEBI:29045
          label: dimercaprol
  evidence:
  - reference: PMID:3540517
    reference_title: "Lead intoxication."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Treatment of patients with positive chelation tests involves symptomatic treatment and a course of chelation therapy utilising calcium disodium edetate in doses similar to those used for testing, and in the more severely intoxicated patient, the addition of dimercaprol in doses of 75 mg/m2 every 4 hours to a total of 300 mg/m2/day."
    explanation: Supports dimercaprol as an established adjunct chelator for severe lead intoxication.
diagnosis:
- name: Blood lead level measurement
  diagnosis_term:
    preferred_term: diagnostic procedure
    term:
      id: MAXO:0000003
      label: diagnostic procedure
    qualifiers:
    - predicate:
        preferred_term: diagnostic procedure
        term:
          id: NCIT:C18020
          label: Diagnostic Procedure
      value:
        preferred_term: laboratory procedure
        term:
          id: NCIT:C25294
          label: Laboratory Procedure
  description: >-
    Venous whole-blood lead measurement is the primary laboratory method for
    confirming lead exposure and determining intervention thresholds.
  markers: Blood lead concentration in venous whole blood
  results: >-
    Elevated blood lead concentration; CDC pediatric blood lead reference value
    cited here is 3.5 microgram/dL.
  evidence:
  - reference: PMID:37478813
    reference_title: "Trends in Blood Lead Levels Quantified by ICP-MS: A Reference Laboratory Retrospective Study."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Consequently, in 2021, the Centers for Disease Control and Prevention (CDC) reduced its blood lead reference value from 5 µg/dL to 3.5 µg/dL in pediatric patients, 1 to 5 years old."
    explanation: Supports blood lead concentration as the core diagnostic and screening measure.
- name: Zinc protoporphyrin testing
  diagnosis_term:
    preferred_term: diagnostic procedure
    term:
      id: MAXO:0000003
      label: diagnostic procedure
    qualifiers:
    - predicate:
        preferred_term: diagnostic procedure
        term:
          id: NCIT:C18020
          label: Diagnostic Procedure
      value:
        preferred_term: laboratory procedure
        term:
          id: NCIT:C25294
          label: Laboratory Procedure
  description: >-
    Zinc protoporphyrin measurement is an adjunct laboratory test reflecting
    disturbed heme synthesis in lead exposure.
  markers: Zinc protoporphyrin
  results: Elevated zinc protoporphyrin supports disrupted heme synthesis in lead exposure.
  evidence:
  - reference: PMID:6202140
    reference_title: "Basophilic stippling of red blood cells: a nonspecific finding of multiple etiology."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Furthermore, BSC has been replaced by blood lead (since the 1940s) and zinc protoporphyrin (since the 1970s) levels for biologic monitoring of lead-exposed workers."
    explanation: Supports zinc protoporphyrin as an adjunct biomarker in evaluation of lead exposure.
- name: EDTA lead mobilization testing
  diagnosis_term:
    preferred_term: diagnostic procedure
    term:
      id: MAXO:0000003
      label: diagnostic procedure
    qualifiers:
    - predicate:
        preferred_term: diagnostic procedure
        term:
          id: NCIT:C18020
          label: Diagnostic Procedure
      value:
        preferred_term: laboratory procedure
        term:
          id: NCIT:C25294
          label: Laboratory Procedure
  description: >-
    In suspected chronic lead nephropathy, EDTA lead mobilization testing can
    help estimate retained body lead burden when blood lead concentration alone
    is insufficient.
  markers: Mobilizable body lead burden after EDTA challenge
  results: Detects increased mobilizable body lead burden in suspected chronic lead nephropathy.
  evidence:
  - reference: PMID:8475950
    reference_title: "Lead nephropathy, gout, and hypertension."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Only evaluation of body lead stores by either the EDTA lead mobilization test or by x-ray fluorescence is helpful in diagnosing lead nephropathy."
    explanation: Supports EDTA lead mobilization testing as a diagnostic approach for retained body lead burden in chronic lead nephropathy.
- name: X-ray fluorescence body burden assessment
  diagnosis_term:
    preferred_term: diagnostic procedure
    term:
      id: MAXO:0000003
      label: diagnostic procedure
    qualifiers:
    - predicate:
        preferred_term: diagnostic procedure
        term:
          id: NCIT:C18020
          label: Diagnostic Procedure
      value:
        preferred_term: X-Ray imaging
        term:
          id: NCIT:C38101
          label: X-Ray Imaging
  description: >-
    X-ray fluorescence can noninvasively assess retained body lead burden in
    patients with suspected chronic lead nephropathy.
  markers: Bone or body lead burden by X-ray fluorescence
  results: Detects increased retained body lead stores in suspected chronic lead nephropathy.
  evidence:
  - reference: PMID:8475950
    reference_title: "Lead nephropathy, gout, and hypertension."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Only evaluation of body lead stores by either the EDTA lead mobilization test or by x-ray fluorescence is helpful in diagnosing lead nephropathy."
    explanation: Supports X-ray fluorescence as a diagnostic method for retained body lead burden in chronic lead nephropathy.
epidemiology:
- name: Pediatric vulnerability
  description: >-
    Children remain the most vulnerable population for lead poisoning because
    common environmental sources intersect with sensitive neurodevelopmental
    windows.
  evidence:
  - reference: PMID:28889260
    reference_title: "Developmental Neurotoxicity of Lead."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Lead exposure is a major concern for the developing nervous system."
    explanation: Supports the special epidemiologic importance of pediatric lead exposure.
- name: Lower pediatric blood lead intervention threshold
  description: >-
    Public-health thresholds for pediatric blood lead intervention have been
    lowered as evidence has accumulated that there is no safe lead exposure
    level.
  evidence:
  - reference: PMID:37478813
    reference_title: "Trends in Blood Lead Levels Quantified by ICP-MS: A Reference Laboratory Retrospective Study."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Consequently, in 2021, the Centers for Disease Control and Prevention (CDC) reduced its blood lead reference value from 5 µg/dL to 3.5 µg/dL in pediatric patients, 1 to 5 years old."
    explanation: Supports contemporary epidemiologic concern about lower-level pediatric lead exposure.
prevalence:
- population: United States population aged 1 year and older, 1991-1994
  percentage: 2.2
  notes: >-
    Historical NHANES III estimate using the then-current threshold of blood
    lead >=10 microgram/dL. This reflects elevated blood lead prevalence rather
    than a modern case definition of clinical lead poisoning.
  evidence:
  - reference: PMID:9799191
    reference_title: "Exposure of the U.S. population to lead, 1991-1994."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The overall mean blood lead level for the U.S. population aged 1 year and older was 2.3 microgram/dl, with 2.2% of the population having levels >=10 microgram/dl, the level of health concern for children."
    explanation: Provides a population-based historical prevalence estimate for elevated blood lead levels in the United States.
- population: Children living in Patna, Bihar, India, 2020
  percentage: 87
  notes: >-
    Local pediatric prevalence estimate for blood lead levels >=5 microgram/dL
    in a high-exposure setting. This is not a general-population prevalence
    estimate for lead poisoning.
  evidence:
  - reference: PMID:36962532
    reference_title: "Prevalence of elevated blood lead levels and risk factors among children living in Patna, Bihar, India 2020."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "About 87% children, 56 Proximal and 62 Distal had BLLs ≥5 μg/dl."
    explanation: Supports a contemporary high-burden pediatric prevalence estimate from a defined environmental exposure setting.
differential_diagnoses:
- name: Cadmium Poisoning
  description: >-
    Cadmium poisoning overlaps with lead toxicity through chronic occupational
    exposure and proximal tubular nephrotoxicity, but the renal phenotype and
    associated laboratory findings differ.
  disease_term:
    preferred_term: cadmium poisoning
    term:
      id: MONDO:0043523
      label: cadmium poisoning
  distinguishing_features:
  - Cadmium causes Fanconi syndrome with low-molecular-weight proteinuria and beta2-microglobulinuria
  - Lead nephropathy instead is associated with hyperuricemia, gout, and hypertension
  - Proximal tubule nuclear inclusion bodies are characteristic of early lead nephropathy
  evidence:
  - reference: PMID:19106433
    reference_title: "Nephrotoxicity of cadmium & lead."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Cadmium in sufficient cumulative dosage leads to the production of the Fanconi syndrome, a generalized proximal tubular reabsorptive defect thought to be related to inhibition of both ATP production and Na-K-ATPase activity. On the other hand, lead accumulation in the proximal tubule leads to hyperuricaemia and gout, presumably by inhibiting uric acid secretion, and diminished glomerular filteration rate (GFR)."
    explanation: Directly contrasts cadmium and lead nephrotoxicity, supporting cadmium poisoning as a major differential diagnosis.
  - reference: PMID:19106433
    reference_title: "Nephrotoxicity of cadmium & lead."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Beta2-microglobulinuria is not found in lead nephropathy."
    explanation: Supports beta2-microglobulinuria as a distinguishing feature favoring cadmium over lead toxicity.
- name: Arsenic Poisoning
  description: >-
    Arsenic poisoning can overlap with lead poisoning through gastrointestinal
    symptoms and neuropathy, but chronic arsenic exposure more strongly
    features characteristic skin findings and carcinogenic sequelae.
  distinguishing_features:
  - Chronic arsenic exposure causes hyperpigmentation and palmoplantar keratoses
  - Arsenic exposure is strongly associated with skin, lung, and bladder cancer
  - Lead poisoning more characteristically shows basophilic stippling, lead-line gingival changes, and ALAD inhibition
  evidence:
  - reference: PMID:28005215
    reference_title: "ARSENIC: A Review on Exposure Pathways, Accumulation, Mobility and Transmission into the Human Food Chain."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "It is proven fact that uptake of inorganic As for a long period can lead to chronic As poisoning and a variety of adverse health effects such as skin, lung and bladder cancer, in addition to cardiovascular diseases, diabetes and gastrointestinal symptoms."
    explanation: Supports the chronic dermatologic and carcinogenic profile that distinguishes arsenic poisoning from lead toxicity.
  - reference: PMID:17405745
    reference_title: "Anaemia and abdominal pain due to occupational lead poisoning."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We describe a 47-year-old patient with chronic anaemia with basophilic stippling of erythrocytes, recurrent abdominal colics, discoloration of gums, sensitive polyneuropathy to the four limbs, hyperuricaemia, hepatosteatosis with raised transaminases, and a long ignored history of lead exposure in a battery recycling plant."
    explanation: Supports the lead-specific constellation of basophilic stippling, abdominal colic, and occupational exposure history.
animal_models:
- species: Mus musculus
  background: C57BL/6
  description: >-
    Adult female C57BL/6 mice exposed to lead in drinking water for 4 months
    develop altered bone mineral density, increased bone turnover, and weaker
    cortical bone, modeling the skeletal reservoir and bone toxicity of chronic
    lead exposure.
  associated_phenotypes:
  - Increased bone turnover
  - Reduced bone strength
  - Altered bone mineral density
  evidence:
  - reference: PMID:20643234
    reference_title: "The effect of lead on bone mineral properties from female adult C57/BL6 mice."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: "These data show that lead increases bone turnover resulting in weaker cortical bone in adult female mice and suggest that lead may exacerbate bone loss and osteoporosis in the elderly."
    explanation: Establishes a chronic murine skeletal model of lead deposition and bone toxicity.
- species: Mus musculus
  background: BALB/cAnNTac
  description: >-
    Developmental lead exposure from gestation through weaning in BALB/cAnNTac
    mice produces adult behavioral abnormalities and whole-brain inflammatory
    gene-expression changes, modeling developmental neurotoxicity.
  associated_phenotypes:
  - Impaired spatial memory
  - Altered exploratory behavior
  - Neuroinflammatory gene-expression changes
  evidence:
  - reference: PMID:22609695
    reference_title: "Developmental lead effects on behavior and brain gene expression in male and female BALB/cAnNTac mice."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: "Pups were exposed to Pb from gestational-day (gd) 8 to postnatal-day (pnd) 21 and later evaluated in exploratory behavior, rotarod, Morris water maze, and resident-intruder assays as adults."
    explanation: Establishes a developmental mouse exposure paradigm for long-term behavioral lead neurotoxicity.
  - reference: PMID:22609695
    reference_title: "Developmental lead effects on behavior and brain gene expression in male and female BALB/cAnNTac mice."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: "Pb-exposure caused significant alterations in exploratory behavior and water maze performance during the probe trial, but rotarod performance was not affected."
    explanation: Supports measurable adult cognitive and behavioral phenotypes in the developmental lead mouse model.
datasets:
- accession: geo:GSE37567
  title: Methodoligies for identifying lead toxicity
  description: >-
    Human PBMC transcriptomic dataset used to quantify the impact of lead on
    cytokine production and gene expression in peripheral blood mononuclear
    cells.
  organism:
    preferred_term: human
    term:
      id: NCBITaxon:9606
      label: Homo sapiens
  data_type: MICROARRAY
  sample_types:
  - preferred_term: peripheral blood mononuclear cells
    cell_type_term:
      preferred_term: peripheral blood mononuclear cell
      term:
        id: CL:0000842
        label: mononuclear leukocyte
    tissue_term:
      preferred_term: blood
      term:
        id: UBERON:0000178
        label: blood
  sample_count: 102
  conditions:
  - lead-associated PBMC cytokine and gene-expression profiling
  evidence:
  - reference: GEO:GSE37567
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "Quantifying impact of lead on cytokine production and gene expression in PBMCs"
    explanation: Supports this dataset as a lead-relevant PBMC transcriptomic resource.
- accession: geo:GSE60598
  title: Early life Lead exposure causes distinct gender specific changes in the DNA methylation profile of DNA extracted from dried blood spots
  description: >-
    Human methylation dataset from dried blood spots in a Detroit pediatric
    cohort, profiling sex-specific epigenomic effects of early-life lead
    exposure.
  organism:
    preferred_term: human
    term:
      id: NCBITaxon:9606
      label: Homo sapiens
  data_type: METHYLATION
  sample_types:
  - preferred_term: dried blood spots
    term:
      id: UBERON:0000178
      label: blood
    tissue_term:
      preferred_term: blood
      term:
        id: UBERON:0000178
        label: blood
  sample_count: 43
  conditions:
  - early-life lead exposure
  - pediatric blood-spot methylation profiling
  exposures:
  - preferred_term: lead exposure
    term:
      id: ECTO:9000945
      label: exposure to lead
  evidence:
  - reference: GEO:GSE60598
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Study of influence of gender and Lead(Pb) exposure on DNA methylation for whole blood measured in dried blood spots for a Detroit cohort of child between the age of 3 months to 5years"
    explanation: Supports this dataset as a pediatric human epigenomic resource for lead exposure effects.
clinical_trials:
- name: NCT00342849
  phase: PHASE_III
  status: COMPLETED
  description: >-
    Treatment of Lead-Exposed Children (TLC) was a randomized, double-blind,
    placebo-controlled multicenter trial comparing succimer chelation with
    placebo in lead-exposed children, with follow-up focused on IQ,
    neuropsychological function, behavior, growth, and blood pressure.
  target_phenotypes:
  - preferred_term: cognitive impairment
    term:
      id: HP:0100543
      label: Cognitive impairment
  evidence:
  - reference: clinicaltrials:NCT00342849
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The Treatment of Lead-Exposed Children (TLC) clinical trial compared the effect of lead chelation with succimer to placebo therapy."
    explanation: Supports a definitive randomized therapeutic trial of succimer in lead-exposed children.
  - reference: clinicaltrials:NCT00342849
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The study was designed to test outcomes in IQ, neuropsychological function, behavior, physical growth and blood pressure three years after initiation of treatment."
    explanation: Supports neurocognitive and physiologic outcome assessment relevant to lead toxicity.
- name: NCT01573013
  phase: NOT_APPLICABLE
  status: COMPLETED
  description: >-
    Interventional study in Morocco evaluating whether iron fortification,
    with or without NaFeEDTA, can reduce blood lead levels and improve growth,
    motor performance, cognition, and iron status in lead-exposed children.
  target_phenotypes:
  - preferred_term: anemia
    term:
      id: HP:0001903
      label: Anemia
  - preferred_term: cognitive impairment
    term:
      id: HP:0100543
      label: Cognitive impairment
  evidence:
  - reference: clinicaltrials:NCT01573013
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "In a follow-on intervention study, the effect of iron fortification with and without NaEDTA on blood lead levels in lead-exposed children will be evaluated; and the relative impact of these two strategies on child growth, motor and cognitive test performance will be compared."
    explanation: Supports an interventional trial targeting both lead burden and functional outcomes in exposed children.
  - reference: clinicaltrials:NCT01573013
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "This study will investigate the potential use of iron fortification to not only combat anemia but also reduce body lead burden in lead-exposed populations; it specifically investigates whether iron fortification with NaFeEDTA could have additional beneficial effects to iron alone."
    explanation: Supports anemia-focused nutritional intervention as part of lead poisoning management research.
- name: NCT05507021
  phase: NOT_APPLICABLE
  status: COMPLETED
  description: >-
    Randomized, placebo-controlled pilot trial evaluating Lactobacillus
    plantarum DSM 33464 as a biologic intervention to reduce blood lead levels
    in young women of child-bearing age.
  target_phenotypes:
  - preferred_term: anemia
    term:
      id: HP:0001903
      label: Anemia
  - preferred_term: cognitive impairment
    term:
      id: HP:0100543
      label: Cognitive impairment
  evidence:
  - reference: clinicaltrials:NCT05507021
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We hypothesize that Lactobacillus Plantarum DSM 33464 reduce lead levels."
    explanation: Supports a completed pilot interventional study aimed at lowering blood lead burden.
  - reference: clinicaltrials:NCT05507021
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "From that pool of subjects, 40 healthy women aged 18 to 40 years will participate in this randomized, placebo controlled pilot clinical trial."
    explanation: Supports the interventional randomized design of this lead-reduction trial.
references:
- reference: DOI:10.1007/s11356-022-19333-5
  title: Systemic review of genetic and epigenetic factors underlying differential toxicity to environmental lead (Pb) exposure
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: Systemic review of genetic and epigenetic factors underlying differential toxicity to environmental lead (Pb) exposure
    supporting_text: Systemic review of genetic and epigenetic factors underlying differential toxicity to environmental lead (Pb) exposure
- reference: DOI:10.1038/s41440-022-01069-x
  title: Public and occupational health risks related to lead exposure updated according to present-day blood lead levels
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: Lead is an environmental hazard that should be addressed worldwide.
    supporting_text: Lead is an environmental hazard that should be addressed worldwide.
    evidence:
    - reference: DOI:10.1038/s41440-022-01069-x
      reference_title: Public and occupational health risks related to lead exposure updated according to present-day blood lead levels
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: Lead is an environmental hazard that should be addressed worldwide.
      explanation: Deep research cited this publication as relevant literature for Lead Poisoning.
- reference: DOI:10.1038/s41598-024-77194-z
  title: Interplay analysis of lead exposure with key cardiovascular gene polymorphisms on blood pressure in a cross-sectional study of occupational workers
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: Interplay analysis of lead exposure with key cardiovascular gene polymorphisms on blood pressure in a cross-sectional study of occupational workers
    supporting_text: Interplay analysis of lead exposure with key cardiovascular gene polymorphisms on blood pressure in a cross-sectional study of occupational workers
- reference: DOI:10.1056/nejm200105103441902
  title: The Effect of Chelation Therapy with Succimer on Neuropsychological Development in Children Exposed to Lead
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: The Effect of Chelation Therapy with Succimer on Neuropsychological Development in Children Exposed to Lead
    supporting_text: The Effect of Chelation Therapy with Succimer on Neuropsychological Development in Children Exposed to Lead
- reference: DOI:10.1056/nejmra2402527
  title: Lead Poisoning
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: Lead Poisoning
    supporting_text: Lead Poisoning
- reference: DOI:10.1097/phh.0000000000001664
  title: 'Childhood Lead Poisoning 1970-2022: Charting Progress and Needed Reforms'
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: 'Childhood Lead Poisoning 1970-2022: Charting Progress and Needed Reforms'
    supporting_text: 'Context: Childhood lead poisoning prevention in the United States was marked by a largely failed medical approach from 1971 to 1990; an emergent (but small) healthy housing primary prevention strategy from 1991 to 2015; and implementation of large-scale proven interventions since then.'
    evidence:
    - reference: DOI:10.1097/phh.0000000000001664
      reference_title: 'Childhood Lead Poisoning 1970-2022: Charting Progress and Needed Reforms'
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: 'Context: Childhood lead poisoning prevention in the United States was marked by a largely failed medical approach from 1971 to 1990; an emergent (but small) healthy housing primary prevention strategy from 1991 to 2015; and implementation of large-scale proven interventions since then.'
      explanation: Deep research cited this publication as relevant literature for Lead Poisoning.
- reference: DOI:10.1111/1468-0009.12596
  title: Improving Equitability and Inclusion for Testing and Detection of Lead Poisoning in US Children
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: Policy Points Child lead poisoning is associated with socioeconomic inequity and perpetuates health inequality.
    supporting_text: Policy Points Child lead poisoning is associated with socioeconomic inequity and perpetuates health inequality.
    evidence:
    - reference: DOI:10.1111/1468-0009.12596
      reference_title: Improving Equitability and Inclusion for Testing and Detection of Lead Poisoning in US Children
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: Policy Points Child lead poisoning is associated with socioeconomic inequity and perpetuates health inequality.
      explanation: Deep research cited this publication as relevant literature for Lead Poisoning.
- reference: DOI:10.1186/s12887-024-04871-3
  title: 'Lead encephalopathy presenting as status epilepticus: a case report'
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: 'Lead encephalopathy presenting as status epilepticus: a case report'
    supporting_text: 'Lead encephalopathy presenting as status epilepticus: a case report'
- reference: DOI:10.1186/s12889-023-16005-y
  title: 'The contribution of secondhand tobacco smoke to blood lead levels in US children and adolescents: a cross-sectional analysis of NHANES 2015–2018'
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: Lead is a major developmental neurotoxicant in children, and tobacco smoke has been suggested as a source of lead exposure in vulnerable populations.
    supporting_text: Lead is a major developmental neurotoxicant in children, and tobacco smoke has been suggested as a source of lead exposure in vulnerable populations.
    evidence:
    - reference: DOI:10.1186/s12889-023-16005-y
      reference_title: 'The contribution of secondhand tobacco smoke to blood lead levels in US children and adolescents: a cross-sectional analysis of NHANES 2015–2018'
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: Lead is a major developmental neurotoxicant in children, and tobacco smoke has been suggested as a source of lead exposure in vulnerable populations.
      explanation: Deep research cited this publication as relevant literature for Lead Poisoning.
- reference: DOI:10.1289/ehp.6517
  title: Reductions in blood lead overestimate reductions in brain lead following repeated succimer regimens in a rodent model of childhood lead exposure.
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: Reductions in blood lead overestimate reductions in brain lead following repeated succimer regimens in a rodent model of childhood lead exposure
    supporting_text: Reductions in blood lead overestimate reductions in brain lead following repeated succimer regimens in a rodent model of childhood lead exposure.
- reference: DOI:10.1289/ehp14336
  title: A Snapshot of Lead in Consumer Products Across Four US Jurisdictions
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: A Snapshot of Lead in Consumer Products Across Four US Jurisdictions
    supporting_text: A Snapshot of Lead in Consumer Products Across Four US Jurisdictions
- reference: DOI:10.3389/fpubh.2023.1073658
  title: 'Toxicomethylomics revisited: A state-of-the-science review about DNA methylation modifications in blood cells from workers exposed to toxic agents'
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: Epigenetic marks have been proposed as early changes, at the subcellular level, in disease development.
    supporting_text: Epigenetic marks have been proposed as early changes, at the subcellular level, in disease development.
    evidence:
    - reference: DOI:10.3389/fpubh.2023.1073658
      reference_title: 'Toxicomethylomics revisited: A state-of-the-science review about DNA methylation modifications in blood cells from workers exposed to toxic agents'
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: Epigenetic marks have been proposed as early changes, at the subcellular level, in disease development.
      explanation: Deep research cited this publication as relevant literature for Lead Poisoning.
- reference: PMID:38863853
  title: Trends in Shortages of Lead Chelators From 2001 to 2022.
  found_in:
  - Lead_Poisoning-deep-research-falcon.md
  findings:
  - statement: All chelators experienced multiple shortages, which became increasingly frequent and prolonged over time.
    supporting_text: All chelators experienced multiple shortages, which became increasingly frequent and prolonged over time.
    evidence:
    - reference: PMID:38863853
      reference_title: Trends in Shortages of Lead Chelators From 2001 to 2022.
      supports: SUPPORT
      evidence_source: OTHER
      snippet: All chelators experienced multiple shortages, which became increasingly frequent and prolonged over time.
      explanation: Deep research cited this publication as relevant literature for Lead Poisoning.

📚

References & Deep Research

References

13

DOI:10.1007/s11356-022-19333-5

Systemic review of genetic and epigenetic factors underlying differential toxicity to environmental lead (Pb) exposure

1 finding

Systemic review of genetic and epigenetic factors underlying differential toxicity to environmental lead (Pb) exposure

"Systemic review of genetic and epigenetic factors underlying differential toxicity to environmental lead (Pb) exposure"

DOI:10.1038/s41440-022-01069-x

Public and occupational health risks related to lead exposure updated according to present-day blood lead levels

1 finding

Lead is an environmental hazard that should be addressed worldwide.

"Lead is an environmental hazard that should be addressed worldwide."

Show evidence (1 reference)

DOI:10.1038/s41440-022-01069-x SUPPORT Human Clinical

"Lead is an environmental hazard that should be addressed worldwide."

Deep research cited this publication as relevant literature for Lead Poisoning.

DOI:10.1038/s41598-024-77194-z

Interplay analysis of lead exposure with key cardiovascular gene polymorphisms on blood pressure in a cross-sectional study of occupational workers

1 finding

Interplay analysis of lead exposure with key cardiovascular gene polymorphisms on blood pressure in a cross-sectional study of occupational workers

"Interplay analysis of lead exposure with key cardiovascular gene polymorphisms on blood pressure in a cross-sectional study of occupational workers"

DOI:10.1056/nejm200105103441902

The Effect of Chelation Therapy with Succimer on Neuropsychological Development in Children Exposed to Lead

1 finding

The Effect of Chelation Therapy with Succimer on Neuropsychological Development in Children Exposed to Lead

"The Effect of Chelation Therapy with Succimer on Neuropsychological Development in Children Exposed to Lead"

DOI:10.1056/nejmra2402527

Lead Poisoning

1 finding

Lead Poisoning

"Lead Poisoning"

DOI:10.1097/phh.0000000000001664

Childhood Lead Poisoning 1970-2022: Charting Progress and Needed Reforms

1 finding

Childhood Lead Poisoning 1970-2022: Charting Progress and Needed Reforms

"Context: Childhood lead poisoning prevention in the United States was marked by a largely failed medical approach from 1971 to 1990; an emergent (but small) healthy housing primary prevention strategy from 1991 to 2015; and implementation of large-scale proven interventions since then."

Show evidence (1 reference)

DOI:10.1097/phh.0000000000001664 SUPPORT Human Clinical

"Context: Childhood lead poisoning prevention in the United States was marked by a largely failed medical approach from 1971 to 1990; an emergent (but small) healthy housing primary prevention strategy from 1991 to 2015; and implementation of large-scale proven interventions since then."

Deep research cited this publication as relevant literature for Lead Poisoning.

DOI:10.1111/1468-0009.12596

Improving Equitability and Inclusion for Testing and Detection of Lead Poisoning in US Children

1 finding

Policy Points Child lead poisoning is associated with socioeconomic inequity and perpetuates health inequality.

"Policy Points Child lead poisoning is associated with socioeconomic inequity and perpetuates health inequality."

Show evidence (1 reference)

DOI:10.1111/1468-0009.12596 SUPPORT Human Clinical

"Policy Points Child lead poisoning is associated with socioeconomic inequity and perpetuates health inequality."

Deep research cited this publication as relevant literature for Lead Poisoning.

DOI:10.1186/s12887-024-04871-3

Lead encephalopathy presenting as status epilepticus: a case report

1 finding

Lead encephalopathy presenting as status epilepticus: a case report

"Lead encephalopathy presenting as status epilepticus: a case report"

DOI:10.1186/s12889-023-16005-y

The contribution of secondhand tobacco smoke to blood lead levels in US children and adolescents: a cross-sectional analysis of NHANES 2015–2018

1 finding

Lead is a major developmental neurotoxicant in children, and tobacco smoke has been suggested as a source of lead exposure in vulnerable populations.

"Lead is a major developmental neurotoxicant in children, and tobacco smoke has been suggested as a source of lead exposure in vulnerable populations."

Show evidence (1 reference)

DOI:10.1186/s12889-023-16005-y SUPPORT Human Clinical

"Lead is a major developmental neurotoxicant in children, and tobacco smoke has been suggested as a source of lead exposure in vulnerable populations."

Deep research cited this publication as relevant literature for Lead Poisoning.

DOI:10.1289/ehp.6517

Reductions in blood lead overestimate reductions in brain lead following repeated succimer regimens in a rodent model of childhood lead exposure.

1 finding

Reductions in blood lead overestimate reductions in brain lead following repeated succimer regimens in a rodent model of childhood lead exposure

"Reductions in blood lead overestimate reductions in brain lead following repeated succimer regimens in a rodent model of childhood lead exposure."

DOI:10.1289/ehp14336

A Snapshot of Lead in Consumer Products Across Four US Jurisdictions

1 finding

A Snapshot of Lead in Consumer Products Across Four US Jurisdictions

"A Snapshot of Lead in Consumer Products Across Four US Jurisdictions"

DOI:10.3389/fpubh.2023.1073658

Toxicomethylomics revisited: A state-of-the-science review about DNA methylation modifications in blood cells from workers exposed to toxic agents

1 finding

Epigenetic marks have been proposed as early changes, at the subcellular level, in disease development.

"Epigenetic marks have been proposed as early changes, at the subcellular level, in disease development."

Show evidence (1 reference)

DOI:10.3389/fpubh.2023.1073658 SUPPORT Human Clinical

"Epigenetic marks have been proposed as early changes, at the subcellular level, in disease development."

Deep research cited this publication as relevant literature for Lead Poisoning.

PMID:38863853

Trends in Shortages of Lead Chelators From 2001 to 2022.

1 finding

All chelators experienced multiple shortages, which became increasingly frequent and prolonged over time.

"All chelators experienced multiple shortages, which became increasingly frequent and prolonged over time."

Show evidence (1 reference)

PMID:38863853 SUPPORT Other

"All chelators experienced multiple shortages, which became increasingly frequent and prolonged over time."

Deep research cited this publication as relevant literature for Lead Poisoning.

Deep Research

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Lead Poisoning (Plumbism): Disease Characteristics Research Report

Edison Scientific Literature 45 citations 2026-05-09T10:38:49.080798

Lead Poisoning (Plumbism): Disease Characteristics Research Report

1. Disease Information

Overview / current understanding

Lead poisoning (also termed plumbism) is a toxicologic disease caused by absorption of lead (Pb) with subsequent systemic distribution and cumulative retention, producing multisystem injury. Contemporary clinical framing emphasizes that toxicity is not limited to overt “classic” poisoning; low-level chronic exposure is linked to neurodevelopmental harm in children and cardiovascular/kidney disease in adults. In a 2024 New England Journal of Medicine review, the CDC’s position is summarized as: “no safe level of lead had been identified in children”. (lanphear2024leadpoisoning. pages 3-5)

Lead has a long biologic residence time because most retained Pb is stored in bone, with only a small fraction present in blood at any time; thus blood lead reflects both recent exposure and mobilization from stores. (lanphear2024leadpoisoning. pages 1-2, yu2023publicandoccupational pages 1-3)

Key identifiers (OMIM / Orphanet / ICD / MeSH / MONDO)

Within the evidence retrieved for this report, explicit ontology/terminology identifiers (ICD-10/ICD-11, MeSH, MONDO, OMIM, Orphanet) were not present in the full-text excerpts available to the system. Therefore, these cannot be provided with evidence-backed citations in this tool run.

Synonyms / alternative names

Lead poisoning
Plumbism
Lead intoxication These terms are used interchangeably in contemporary clinical literature. (lanphear2024leadpoisoning. pages 1-2)

Evidence source type

The content summarized here is derived primarily from aggregated disease-level resources (high-impact reviews and policy analyses) and primary studies (randomized trial, observational epidemiology, case report), rather than EHR-only patient-level data. (lanphear2024leadpoisoning. pages 3-5, rogan2001theeffectof pages 1-2, obeng2023thecontributionof pages 2-4)

2. Etiology

Disease causal factors

Lead poisoning is environmental/toxicant-induced.

Routes of exposure are primarily ingestion and inhalation. (lanphear2024leadpoisoning. pages 2-3, yu2023publicandoccupational pages 1-3)

Major sources highlighted in recent clinical/public-health syntheses include: * Legacy lead-based paint and dust/soil contamination around older housing (especially pre-1960 housing). (lanphear2024leadpoisoning. pages 2-3) * Water contamination from lead service lines and plumbing components. (lanphear2024leadpoisoning. pages 1-2, lanphear2024leadpoisoning. pages 2-3) * Industrial emissions and occupational exposures (smelting, battery production/recycling, construction). (lanphear2024leadpoisoning. pages 1-2, lanphear2024leadpoisoning. pages 2-3, yu2023publicandoccupational pages 1-3) * Consumer products (spices, ceramic/metal cookware, traditional remedies, cultural powders, cosmetics, jewelry/toys). (porterfield2024asnapshotof pages 1-2, porterfield2024asnapshotof pages 2-3, porterfield2024asnapshotof pages 5-6) * Ongoing specialized uses such as aviation fuel and ammunition (and retained bullet fragments). (lanphear2024leadpoisoning. pages 1-2, lanphear2024leadpoisoning. pages 2-3)

Risk factors

Host risk factors / vulnerability: * Young age: children absorb Pb more readily and have high-risk behaviors (hand-to-mouth). (lanphear2024leadpoisoning. pages 2-3, cuomo2022systemicreviewof pages 1-3) * Nutritional deficiencies: iron or calcium deficiency increases absorption; absorption increases with iron/calcium deficiency. (lanphear2024leadpoisoning. pages 2-3, cuomo2022systemicreviewof pages 1-3) * Pregnancy and postpartum: increased risk of mobilization from bone stores and adverse birth outcomes; maternal Pb is linked to preterm birth. (lanphear2024leadpoisoning. pages 3-5, lanphear2024leadpoisoning. pages 1-2)

Social and environmental risk factors: * Older, poorly maintained housing stock. (lanphear2024leadpoisoning. pages 2-3, jacobs2023childhoodleadpoisoning pages 4-6) * Occupational exposure in lead-related industries. (yu2023publicandoccupational pages 1-3) * Consumer products and imported goods exposure, especially in immigrant/refugee communities. (porterfield2024asnapshotof pages 1-2) * Secondhand tobacco smoke exposure as an additional contributor to children’s BLLs (NHANES 2015–2018). (obeng2023thecontributionof pages 2-4, obeng2023thecontributionof pages 1-2)

Protective factors

Evidence in retrieved texts supports that improved nutrition (addressing iron deficiency; ensuring adequate calcium and vitamin C) is considered part of management and may reduce absorption risk, but the excerpts do not provide trial-grade quantification of protective effect size. (lowry2010oralchelationtherapy pages 6-9)

Gene–environment interactions

Recent evidence supports interindividual susceptibility via gene–environment interactions: * In occupationally exposed workers, SNP-by-lead interactions were reported for blood pressure traits. In one cross-sectional study (568 workers), the CCM3 rs3804610 interaction corresponded to SBP +0.53 mmHg and DBP +0.34 mmHg per 1 µg/dL blood lead contrast in risk-allele carriers; VEGFR2 rs2305948 showed negative interaction (SBP −0.28 mmHg; DBP −0.22 mmHg). (ou2024interplayanalysisof pages 1-2) * A 2022 systematic review summarizes candidate susceptibility loci affecting Pb kinetics and effects (e.g., ALAD, VDR, HFE, GST genes, MT2A) and notes sex- and exposure-dependent effects in some studies. (cuomo2022systemicreviewof pages 6-7)

3. Phenotypes

Core clinical manifestations (symptoms/signs/labs)

A contemporary clinical review describes classic symptoms including fatigue, headache, irritability, abdominal colic and constipation, with very high blood lead levels associated with seizures, encephalopathy, and death. (lanphear2024leadpoisoning. pages 1-2)

Severe neurologic phenotype (pediatric encephalopathy): A 2024 case report describes a 4-year-old presenting with refractory status epilepticus, profound microcytic anemia, and developmental delay at BLL 116.2 µg/dL. (kamal2024leadencephalopathypresenting pages 1-2)

Age of onset, severity, progression

Children: effects can be subtle and neurodevelopmental at low exposures; severe acute manifestations can include encephalopathy and seizures at high BLLs. (lanphear2024leadpoisoning. pages 3-5, kamal2024leadencephalopathypresenting pages 2-4)
Adults: low-level chronic exposure is linked to hypertension, chronic kidney disease/failure, and cardiovascular disease. (lanphear2024leadpoisoning. pages 1-2, yu2023publicandoccupational pages 1-3)

Suggested HPO terms (non-exhaustive; derived from described phenotypes)

Because HPO identifiers were not included in the retrieved sources, the following are suggested mapping targets (to be verified against HPO): * Seizures; status epilepticus (pediatric encephalopathy) (kamal2024leadencephalopathypresenting pages 1-2) * Encephalopathy (lanphear2024leadpoisoning. pages 1-2, kamal2024leadencephalopathypresenting pages 2-4) * Abdominal pain / colic; constipation (lanphear2024leadpoisoning. pages 1-2) * Microcytic anemia (kamal2024leadencephalopathypresenting pages 1-2) * Developmental delay / cognitive impairment; ADHD / attention problems (lanphear2024leadpoisoning. pages 3-5, kamal2024leadencephalopathypresenting pages 1-2) * Hypertension (yu2023publicandoccupational pages 1-3) * Chronic kidney disease/failure (lanphear2024leadpoisoning. pages 1-2, yu2023publicandoccupational pages 1-3)

4. Genetic / Molecular Information

Causal genes

Lead poisoning is not a Mendelian disorder; it is primarily a toxicant exposure condition. Genetic factors act mainly as susceptibility/modifier loci (gene–environment interaction) rather than single-gene causation. (cuomo2022systemicreviewof pages 6-7)

Modifier genes / susceptibility loci (examples in retrieved evidence)

CCM3 (PDCD10) rs3804610; VEGFR2 (KDR) rs2305948; NOTCH1 rs3124591 in an occupational interaction study of lead and blood pressure. (ou2024interplayanalysisof pages 1-2)
Candidate genes summarized as influencing Pb kinetics/effects: ALAD, VDR, HFE, GST genes, metallothionein, iron transport genes. (cuomo2022systemicreviewof pages 6-7)

Epigenetic information

A 2023 state-of-the-science review on occupational toxicant exposure methylation emphasizes that lead exposure is associated with DNA methylation changes (e.g., promoter hypermethylation of genes such as ALAD, tumor suppressor loci, and global methylation shifts), but cautions that due to limited longitudinal evidence and heterogeneity “we cannot say that DNA methylation changes are predictive of disease development due to those exposures.” (jimenezgarza2023toxicomethylomicsrevisiteda pages 1-2)

5. Environmental Information

Environmental factors and real-world exposure sources

A 2024 high-impact synthesis summarizes lead sources as including legacy paint/soil, water lines, consumer products (spices, ceramics, cosmetics), industrial emissions, and specific ongoing uses (aviation fuel, ammunition). (lanphear2024leadpoisoning. pages 1-2, lanphear2024leadpoisoning. pages 2-3)

Lifestyle factors

Secondhand tobacco smoke may be a measurable contributor to children’s BLLs: NHANES 2015–2018 data (ages 6–19 years) showed adjusted geometric mean BLLs were 18% higher at intermediate cotinine and 29% higher at high cotinine relative to low cotinine. (obeng2023thecontributionof pages 1-2)

6. Mechanism / Pathophysiology

Toxicokinetics and causal chain (trigger → biology → phenotype)

Trigger: inhalation/ingestion exposure, with enhanced absorption under iron/calcium deficiency and in young children. (lanphear2024leadpoisoning. pages 2-3)

Distribution and storage: most retained Pb is stored in bone (skeleton), with a small blood fraction primarily in red blood cells; bone lead can be remobilized (e.g., physiologic states such as menopause). (lanphear2024leadpoisoning. pages 1-2, yu2023publicandoccupational pages 1-3)

Cellular/molecular injury mechanisms (as described in retrieved evidence): * Metal mimicry and transport: Pb mimics calcium/iron/zinc and can enter cells via calcium channels and DMT1. (lanphear2024leadpoisoning. pages 2-3) * Oxidative stress and thiol binding are repeatedly invoked as core mechanisms across organ systems. (cuomo2022systemicreviewof pages 1-3)

Clinical endpoints: neurodevelopmental impairment (children), cardiovascular disease and hypertension (adults), and kidney disease. (lanphear2024leadpoisoning. pages 1-2, yu2023publicandoccupational pages 1-3)

Suggested ontology terms

Because GO/CL/Reactome identifiers were not provided in retrieved excerpts, the following are suggested targets (to be verified): * GO (process): response to toxic substance; oxidative stress response; metal ion homeostasis; neurodevelopment * CL (cells): neurons; glial cells; erythrocytes; renal tubular epithelial cells; vascular smooth muscle cells

7. Anatomical Structures Affected

Evidence supports multi-organ involvement: * Nervous system (brain; neurodevelopmental effects; encephalopathy, seizures). (lanphear2024leadpoisoning. pages 3-5, kamal2024leadencephalopathypresenting pages 1-2) * Blood/hematopoietic system (anemia in severe pediatric case). (kamal2024leadencephalopathypresenting pages 1-2) * Kidney (chronic kidney disease/failure associations in adults). (lanphear2024leadpoisoning. pages 1-2) * Cardiovascular system (hypertension, cardiovascular disease). (lanphear2024leadpoisoning. pages 1-2, yu2023publicandoccupational pages 1-3) * Skeleton/bone as major reservoir for Pb. (lanphear2024leadpoisoning. pages 1-2)

Suggested UBERON targets (to be verified): brain; kidney; heart; aorta; skeleton/bone tissue.

8. Temporal Development

Onset patterns

Lead poisoning may be acute (high-dose exposure with colic/encephalopathy) or chronic/insidious with low-level exposure producing subtle neurocognitive harms (children) and cardiometabolic disease risk (adults). (lanphear2024leadpoisoning. pages 1-2, lanphear2024leadpoisoning. pages 2-3)

Critical windows

Childhood neurodevelopment is a key window of vulnerability, with lasting cognitive/behavioral sequelae and limited reversibility emphasized in public health analyses. (sobin2023improvingequitabilityand pages 3-3, lanphear2024leadpoisoning. pages 3-5)

9. Inheritance and Population

Epidemiology and burden (selected statistics)

A 2023 policy/housing review reports a dramatic decline in U.S. pediatric blood lead over decades (NHANES geometric mean 12.8 → 0.82 µg/dL from 1976–1980 to 2015–2016) and gives 2015–2016 prevalence estimates (ages 1–5): 1.3% ≥5 µg/dL and 0.2% ≥10 µg/dL. (jacobs2023childhoodleadpoisoning pages 4-6)

A 2024 consumer-product surveillance synthesis cites a 2021 estimate that 21,172 children (1.9%) had BLLs ≥ the then-reference value (5 µg/dL), and after the BLRV dropped to 3.5 µg/dL an estimated 2.5% of U.S. children would exceed it. (porterfield2024asnapshotof pages 1-2)

Global burden: the 2024 NEJM review cites 2019 estimates of 5.5 million cardiovascular deaths and 765 million IQ points lost attributable to lead exposure globally. (lanphear2024leadpoisoning. pages 1-2)

Population disparities

The testing and prevention literature emphasizes socioeconomic inequities and persistent disparities, and argues that primary prevention (removing lead from environments) is the definitive solution. (sobin2023improvingequitabilityand pages 3-3)

10. Diagnostics

Clinical tests / biomarkers

Venous whole-blood lead level (BLL) is emphasized as the most widely used biomarker of exposure. (lanphear2024leadpoisoning. pages 1-2)

A 2024 NEJM review summarizes that blood lead is mostly in red blood cells and is the standard biomarker; bone lead can be measured in research contexts and constitutes cumulative burden. (lanphear2024leadpoisoning. pages 1-2)

Testing implementation / methods: A policy analysis proposes expanded use of capillary testing (with “clean” collection training) and recommends sensitive analytical methods (ICP-MS or graphite furnace AAS) with low limits of detection to support detection at low BLLs under the 3.5 µg/dL reference value. (sobin2023improvingequitabilityand pages 3-3)

Screening / thresholds (as supported in retrieved evidence)

CDC blood lead reference value lowered to 3.5 µg/dL (2021). (lanphear2024leadpoisoning. pages 2-3, sobin2023improvingequitabilityand pages 3-3)

11. Outcome / Prognosis

Low-level exposure can have persistent effects (particularly neurodevelopment), and severe acute toxicity can be fatal or cause long-term neurologic sequelae. The 2024 severe pediatric encephalopathy case report emphasizes that rapid recognition and appropriate management is essential for “neurologically intact survival.” (kamal2024leadencephalopathypresenting pages 1-2)

12. Treatment

Core treatment principles

Remove/stop exposure and perform environmental investigation/abatement; chelation is not a substitute for hazard control. (lowry2010oralchelationtherapy pages 6-9)

Chelation therapy

Evidence base (children with moderate BLLs)

The pivotal multicenter randomized trial (TLC) enrolled 780 children aged 12–33 months with BLLs 20–44 µg/dL. Succimer reduced mean BLL by 4.5 µg/dL over the first 6 months, but at 36 months: “Treatment with succimer did not lead to better scores on cognitive, neuropsychological, or behavioral tests than placebo.” (rogan2001theeffectof pages 5-6, rogan2001theeffectof pages 3-5)

Severe poisoning / encephalopathy

A 2024 pediatric encephalopathy case report notes encephalopathy typically occurs at >80–100 µg/dL, and describes combined chelation (succimer, calcium disodium EDTA, and dimercaprol) with repeated courses due to rebound; it provides BSA-based dosing examples for succimer and EDTA and highlights need for close monitoring. (kamal2024leadencephalopathypresenting pages 2-4, kamal2024leadencephalopathypresenting pages 1-2)

Real-world implementation constraints: chelator shortages

A 2024 analysis of U.S. shortages (2001–2022) identified 13 chelator shortages, with prolonged and overlapping episodes and large price increases. CaNa2EDTA was unavailable for 22.5% of the period; and BAL’s sole U.S. manufacturer (Akorn) permanently shut down in February 2023. (whitledge2024trendsinshortages pages 4-5)

Suggested MAXO terms (to be verified)

Chelation therapy
Environmental exposure removal / abatement
Blood lead screening
Nutritional supplementation (iron/calcium) as supportive care

13. Prevention

Primary prevention

Multiple authoritative sources emphasize that definitive prevention requires removing lead hazards before exposure (“primary prevention”), especially in housing and in the imported consumer-product supply chain. (sobin2023improvingequitabilityand pages 3-3, porterfield2024asnapshotof pages 1-2)

Secondary prevention: screening/testing

A 2023 policy analysis proposes practical improvements to raise equitable detection capacity, including acceptance of capillary samples for final determination (with standardized training/certification) and sensitive analytical methods to support low-level measurement. (sobin2023improvingequitabilityand pages 3-3)

Public health interventions in practice

A 2024 Environmental Health Perspectives analysis argues consumer products are an increasingly important source: across four U.S. jurisdictions, consumer products were identified in 15%–38% of investigations, supporting the need for national product surveillance databases and upstream interventions in countries of origin. (porterfield2024asnapshotof pages 1-2, porterfield2024asnapshotof pages 3-5)

14. Other Species / Natural Disease

No species-specific veterinary/natural disease evidence was retrieved in the provided corpus for this run. Therefore, this section cannot be completed with citations.

15. Model Organisms

Model-organism evidence in the retrieved corpus includes a rodent study showing that blood lead reductions after succimer can overestimate brain lead reductions, emphasizing limitations of using blood lead as a surrogate for neurotoxicant burden. (stangle2004reductionsinblood pages 5-6)

No additional detailed model-organism inventories (mouse/rat/zebrafish/cell models) were retrievable in the excerpts available here; thus this section is partial.

Key quantitative summary tables

Item	Population/Context	Value(s) & Units	Year/Period	Source (first author, journal)	URL	Evidence citation id
CDC blood lead reference value (BLRV)	U.S. children; CDC reference/action benchmark	Lowered to 3.5 µg/dL (from 5 µg/dL)	2021	Lanphear, NEJM; Sobin, Milbank Quarterly	https://doi.org/10.1056/NEJMra2402527 ; https://doi.org/10.1111/1468-0009.12596	(lanphear2024leadpoisoning. pages 2-3, sobin2023improvingequitabilityand pages 3-3)
U.S. child prevalence at prior BLRV	U.S. children with BLLs at or above prior CDC BLRV	21,172 children (1.9%) at ≥5 µg/dL	2021 study cited in 2024 review	Porterfield, Environmental Health Perspectives	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 1-2)
U.S. child prevalence at current BLRV	U.S. children expected above current BLRV	2.5% expected at ≥3.5 µg/dL	Post-2021 BLRV estimate	Porterfield, Environmental Health Perspectives	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 1-2)
NHANES decline in pediatric blood lead	U.S. children aged 1–5 years; geometric mean BLL	12.8 → 0.82 µg/dL	1976–1980 to 2015–2016	Jacobs, J Public Health Management Practice	https://doi.org/10.1097/PHH.0000000000001664	(jacobs2023childhoodleadpoisoning pages 4-6)
NHANES decline in general-population blood lead	U.S. NHANES population metric	13.1 → 1.64 µg/dL	1976–1980 to 1999–2002	Yu, Hypertension Research	https://doi.org/10.1038/s41440-022-01069-x	(yu2023publicandoccupational pages 1-3)
Skeletal lead storage fraction	Retained body lead stored in skeleton	70% in children; 95% in adults	Contemporary toxicokinetic summary	Lanphear, NEJM	https://doi.org/10.1056/NEJMra2402527	(lanphear2024leadpoisoning. pages 1-2, lanphear2024leadpoisoning. pages 3-5)
Severe toxicity threshold: encephalopathy	Pediatric severe lead poisoning	Encephalopathy typically at >80–100 µg/dL	Contemporary case-based review	Kamal, BMC Pediatrics	https://doi.org/10.1186/s12887-024-04871-3	(kamal2024leadencephalopathypresenting pages 2-4)
Very high acute toxicity threshold	Severe acute poisoning, all ages	>800 µg/L associated with seizures, encephalopathy, death	Contemporary clinical review	Lanphear, NEJM	https://doi.org/10.1056/NEJMra2402527	(lanphear2024leadpoisoning. pages 1-2)
Chelation trial eligibility range	TLC randomized trial in children aged 12–33 months	Baseline venous BLL 20–44 µg/dL	Trial enrollment period 1994–1997; report 2001	Rogan, NEJM	https://doi.org/10.1056/NEJM200105103441902	(rogan2001theeffectof pages 1-2)
Chelation effect size on blood lead	TLC trial; succimer vs placebo	Mean BLL reduction 4.5 µg/dL over first 6 months	2001 report	Rogan, NEJM	https://doi.org/10.1056/NEJM200105103441902	(rogan2001theeffectof pages 1-2, rogan2001theeffectof pages 5-6)
Chelation neurodevelopmental outcome	TLC trial; cognition/behavior	No significant cognitive, neuropsychological, or behavioral benefit despite BLL reduction	36-month follow-up; 2001 report	Rogan, NEJM	https://doi.org/10.1056/NEJM200105103441902	(rogan2001theeffectof pages 5-6, rogan2001theeffectof pages 3-5)

Table: This table compiles the main quantitative thresholds and epidemiologic statistics for lead poisoning drawn from the gathered evidence. It highlights current CDC benchmarks, prevalence estimates, toxicokinetic facts, severe-toxicity thresholds, and the major randomized chelation trial findings.

Domain	Jurisdiction/Agent	Metric	Value	Time window	Source (author/journal)	URL	Evidence citation id
Exposure sources	California	Consumer-products-only share of investigations	25.8% (93/360)	FY2019	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 2-3)
Exposure sources	California	Housing-only share of investigations	27.5% (99/360)	FY2019	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 2-3)
Exposure sources	California	Consumer-product attribution range across investigations	22.3%–39.6%	FY2016–FY2020	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 3-5, porterfield2024asnapshotof pages 2-3)
Exposure sources	Oregon	Consumer-products-only share of investigations	16.7% (30/180)	CY2019	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 2-3)
Exposure sources	Oregon	Housing-only share of investigations	14.4% (26/180)	CY2019	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 2-3)
Exposure sources	Oregon	Consumer-product attribution range across investigations	9.2%–19.1%	CY2016–CY2017 examples; broader review 2010–2021 noted 2%–20%	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 3-5, porterfield2024asnapshotof pages 2-3)
Exposure sources	New York City	Consumer-product attribution share	29.4%	FY2019	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 2-3)
Exposure sources	New York City	Housing-related attribution share	64.2%	FY2019	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 2-3)
Exposure sources	New York City	Multiple-source context	~90% of children had multiple potential exposure sources	FY2019	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 2-3)
Exposure sources	King County, WA	Consumer-product attribution share	38.1%	CY2019	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 3-5)
Exposure sources	King County, WA	Housing-related attribution share	61.9%	CY2019	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 3-5)
Exposure sources	King County, WA	Consumer-product attribution range across investigations	37%–46%	2019–2021	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 3-5)
Exposure sources	Four jurisdictions combined	Consumer products identified as potential source	15%–38% of investigations	2010–2021	Porterfield et al., Environmental Health Perspectives (2024)	https://doi.org/10.1289/ehp14336	(porterfield2024asnapshotof pages 1-2)
Chelator supply	All lead chelators	Total shortage events	13 shortages	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 1-2, whitledge2024trendsinshortages pages 2-4)
Chelator supply	All lead chelators	Median shortage duration	7.4 months	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 1-2)
Chelator supply	Parenteral chelators	Share of shortages	61.5%	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 1-2, whitledge2024trendsinshortages pages 2-4)
Chelator supply	Parenteral vs non-parenteral	Median shortage duration comparison	14.2 months vs 2.2 months	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 4-5, whitledge2024trendsinshortages pages 1-2, whitledge2024trendsinshortages pages 2-4)
Chelator supply	Concurrent shortages	Overlapping shortage time	3.7% of study period	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 1-2)
Chelator supply	CaNa2EDTA	Number of shortages	4	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 4-5, whitledge2024trendsinshortages pages 2-4)
Chelator supply	CaNa2EDTA	Total shortage months	60.3 months	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 2-4)
Chelator supply	CaNa2EDTA	Median shortage duration	21.2 months	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 2-4)
Chelator supply	CaNa2EDTA	Downtime as share of study period	22.5% unavailable	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 4-5)
Chelator supply	CaNa2EDTA	Average wholesale price (AWP) increase	$42.40 to $6,730	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 4-5)
Chelator supply	BAL (dimercaprol)	Number of shortages	4	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 4-5, whitledge2024trendsinshortages pages 2-4)
Chelator supply	BAL (dimercaprol)	Total shortage months	29.5 months	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 2-4)
Chelator supply	BAL (dimercaprol)	Median shortage duration	5.8 months	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 2-4)
Chelator supply	BAL (dimercaprol)	Manufacturing disruption	Sole US manufacturer Akorn permanently shut down after Chapter 7 bankruptcy	Feb 2023	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 4-5, whitledge2024trendsinshortages pages 8-10)
Chelator supply	DMSA (succimer)	Number of shortages	2	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 4-5, whitledge2024trendsinshortages pages 2-4)
Chelator supply	DMSA (succimer)	Total shortage months	8.3 months	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 2-4)
Chelator supply	DMSA (succimer)	Median shortage duration	4.2 months	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 2-4)
Chelator supply	DMSA (succimer)	Downtime as share of study period	3.1% unavailable	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 4-5)
Chelator supply	DMSA (succimer)	Average wholesale price (AWP) increase	$469 to $2,671	2001–2022	Whitledge et al., JPPT (2024)	https://doi.org/10.5863/1551-6776-29.3.306	(whitledge2024trendsinshortages pages 4-5)

Table: This table summarizes recent U.S. data on source attribution for pediatric lead exposure across four jurisdictions and on shortages of major lead chelators. It is useful for contrasting exposure epidemiology with real-world treatment access constraints.

Notes on evidence gaps and identifier limitations

This report prioritizes 2023–2024 sources where available (e.g., Lanphear NEJM 2024; Porterfield EHP 2024; Yu Hypertension Research 2023; Sobin Milbank Quarterly 2023; Obeng BMC Public Health 2023; Whitledge JPPT 2024; Kamal BMC Pediatrics 2024). However, formal disease ontology identifiers (MONDO, MeSH, ICD-10/11) and some requested structured ontology mappings (HPO/GO/CL/UBERON IDs) were not present in the tool-retrieved excerpts; consequently, they are provided only as suggested concepts without identifier codes when not evidence-backed.

Source figure (visual evidence)

Lanphear et al. (2024) Figure 2 (as retrieved) summarizes major exposure sources and body distribution, including bone storage fractions (70% children; 95% adults). (lanphear2024leadpoisoning. media 5797edb2)

References

(lanphear2024leadpoisoning. pages 3-5): Bruce Lanphear, Ana Navas-Acien, and David C. Bellinger. Lead poisoning. The New England journal of medicine, 391 17:1621-1631, Oct 2024. URL: https://doi.org/10.1056/nejmra2402527, doi:10.1056/nejmra2402527. This article has 68 citations and is from a highest quality peer-reviewed journal.
(lanphear2024leadpoisoning. pages 1-2): Bruce Lanphear, Ana Navas-Acien, and David C. Bellinger. Lead poisoning. The New England journal of medicine, 391 17:1621-1631, Oct 2024. URL: https://doi.org/10.1056/nejmra2402527, doi:10.1056/nejmra2402527. This article has 68 citations and is from a highest quality peer-reviewed journal.
(yu2023publicandoccupational pages 1-3): Yu-Ling Yu, Wen-Yi Yang, Azusa Hara, Kei Asayama, Harry A. Roels, Tim S. Nawrot, and Jan A. Staessen. Public and occupational health risks related to lead exposure updated according to present-day blood lead levels. Hypertension Research, 46:395-407, Oct 2023. URL: https://doi.org/10.1038/s41440-022-01069-x, doi:10.1038/s41440-022-01069-x. This article has 56 citations and is from a peer-reviewed journal.
(rogan2001theeffectof pages 1-2): Walter J. Rogan, Kim N. Dietrich, James H. Ware, Douglas W. Dockery, Mikhail Salganik, Jerilynn Radcliffe, Robert L. Jones, N. Beth Ragan, J. Julian Chisolm, and George G. Rhoads. The effect of chelation therapy with succimer on neuropsychological development in children exposed to lead. The New England journal of medicine, 344 19:1421-6, May 2001. URL: https://doi.org/10.1056/nejm200105103441902, doi:10.1056/nejm200105103441902. This article has 493 citations and is from a highest quality peer-reviewed journal.
(obeng2023thecontributionof pages 2-4): Alexander Obeng, Taehyun Roh, Anisha Aggarwal, Kido Uyasmasi, and Genny Carrillo. The contribution of secondhand tobacco smoke to blood lead levels in us children and adolescents: a cross-sectional analysis of nhanes 2015–2018. BMC Public Health, Jun 2023. URL: https://doi.org/10.1186/s12889-023-16005-y, doi:10.1186/s12889-023-16005-y. This article has 12 citations and is from a peer-reviewed journal.
(lanphear2024leadpoisoning. pages 2-3): Bruce Lanphear, Ana Navas-Acien, and David C. Bellinger. Lead poisoning. The New England journal of medicine, 391 17:1621-1631, Oct 2024. URL: https://doi.org/10.1056/nejmra2402527, doi:10.1056/nejmra2402527. This article has 68 citations and is from a highest quality peer-reviewed journal.
(porterfield2024asnapshotof pages 1-2): Kate Porterfield, Paromita Hore, Stephen G. Whittaker, Katie M. Fellows, Anshu Mohllajee, Shakoora Azimi-Gaylon, Berna Watson, Isabel Grant, and Richard Fuller. A snapshot of lead in consumer products across four us jurisdictions. Environmental Health Perspectives, Jul 2024. URL: https://doi.org/10.1289/ehp14336, doi:10.1289/ehp14336. This article has 10 citations and is from a highest quality peer-reviewed journal.
(porterfield2024asnapshotof pages 2-3): Kate Porterfield, Paromita Hore, Stephen G. Whittaker, Katie M. Fellows, Anshu Mohllajee, Shakoora Azimi-Gaylon, Berna Watson, Isabel Grant, and Richard Fuller. A snapshot of lead in consumer products across four us jurisdictions. Environmental Health Perspectives, Jul 2024. URL: https://doi.org/10.1289/ehp14336, doi:10.1289/ehp14336. This article has 10 citations and is from a highest quality peer-reviewed journal.
(porterfield2024asnapshotof pages 5-6): Kate Porterfield, Paromita Hore, Stephen G. Whittaker, Katie M. Fellows, Anshu Mohllajee, Shakoora Azimi-Gaylon, Berna Watson, Isabel Grant, and Richard Fuller. A snapshot of lead in consumer products across four us jurisdictions. Environmental Health Perspectives, Jul 2024. URL: https://doi.org/10.1289/ehp14336, doi:10.1289/ehp14336. This article has 10 citations and is from a highest quality peer-reviewed journal.
(cuomo2022systemicreviewof pages 1-3): Danila Cuomo, Margaret J. Foster, and David Threadgill. Systemic review of genetic and epigenetic factors underlying differential toxicity to environmental lead (pb) exposure. Environmental Science and Pollution Research, 29:35583-35598, Mar 2022. URL: https://doi.org/10.1007/s11356-022-19333-5, doi:10.1007/s11356-022-19333-5. This article has 62 citations and is from a peer-reviewed journal.
(jacobs2023childhoodleadpoisoning pages 4-6): David E. Jacobs and Mary Jean Brown. Childhood lead poisoning 1970-2022: charting progress and needed reforms. Journal of Public Health Management and Practice, 29:230-240, Nov 2023. URL: https://doi.org/10.1097/phh.0000000000001664, doi:10.1097/phh.0000000000001664. This article has 48 citations and is from a peer-reviewed journal.
(obeng2023thecontributionof pages 1-2): Alexander Obeng, Taehyun Roh, Anisha Aggarwal, Kido Uyasmasi, and Genny Carrillo. The contribution of secondhand tobacco smoke to blood lead levels in us children and adolescents: a cross-sectional analysis of nhanes 2015–2018. BMC Public Health, Jun 2023. URL: https://doi.org/10.1186/s12889-023-16005-y, doi:10.1186/s12889-023-16005-y. This article has 12 citations and is from a peer-reviewed journal.
(lowry2010oralchelationtherapy pages 6-9): JA Lowry. Oral chelation therapy for patients with lead poisoning. Unknown journal, 2010.
(ou2024interplayanalysisof pages 1-2): Xiao-yan Ou, Chen Xiao, Jun Jiang, Xin-xia Liu, Lili Liu, Yao Lu, Weipeng Zhang, Yun-Shao He, and Zhiqiang Zhao. Interplay analysis of lead exposure with key cardiovascular gene polymorphisms on blood pressure in a cross-sectional study of occupational workers. Scientific Reports, Nov 2024. URL: https://doi.org/10.1038/s41598-024-77194-z, doi:10.1038/s41598-024-77194-z. This article has 1 citations and is from a peer-reviewed journal.
(cuomo2022systemicreviewof pages 6-7): Danila Cuomo, Margaret J. Foster, and David Threadgill. Systemic review of genetic and epigenetic factors underlying differential toxicity to environmental lead (pb) exposure. Environmental Science and Pollution Research, 29:35583-35598, Mar 2022. URL: https://doi.org/10.1007/s11356-022-19333-5, doi:10.1007/s11356-022-19333-5. This article has 62 citations and is from a peer-reviewed journal.
(kamal2024leadencephalopathypresenting pages 1-2): Iqra J. Kamal, Trevor Cerbini, Amanda Clouser, Aileen Hernandez, and Diane P. Calello. Lead encephalopathy presenting as status epilepticus: a case report. BMC Pediatrics, Oct 2024. URL: https://doi.org/10.1186/s12887-024-04871-3, doi:10.1186/s12887-024-04871-3. This article has 4 citations and is from a peer-reviewed journal.
(kamal2024leadencephalopathypresenting pages 2-4): Iqra J. Kamal, Trevor Cerbini, Amanda Clouser, Aileen Hernandez, and Diane P. Calello. Lead encephalopathy presenting as status epilepticus: a case report. BMC Pediatrics, Oct 2024. URL: https://doi.org/10.1186/s12887-024-04871-3, doi:10.1186/s12887-024-04871-3. This article has 4 citations and is from a peer-reviewed journal.
(jimenezgarza2023toxicomethylomicsrevisiteda pages 1-2): Octavio Jiménez-Garza, Manosij Ghosh, Timothy M. Barrow, and Lode Godderis. Toxicomethylomics revisited: a state-of-the-science review about dna methylation modifications in blood cells from workers exposed to toxic agents. Frontiers in Public Health, Feb 2023. URL: https://doi.org/10.3389/fpubh.2023.1073658, doi:10.3389/fpubh.2023.1073658. This article has 7 citations.
(sobin2023improvingequitabilityand pages 3-3): CHRISTINA SOBIN, MARISELA GUTIéRREZ‐VEGA, GISEL FLORES‐MONTOYA, MICHELLE DEL RIO, JUAN M. ALVAREZ, ALEXANDER OBENG, JALEEN AVILA, and GANGA HETTIARACHCHI. Improving equitability and inclusion for testing and detection of lead poisoning in us children. The Milbank Quarterly, 101:48-73, Jan 2023. URL: https://doi.org/10.1111/1468-0009.12596, doi:10.1111/1468-0009.12596. This article has 11 citations.
(rogan2001theeffectof pages 5-6): Walter J. Rogan, Kim N. Dietrich, James H. Ware, Douglas W. Dockery, Mikhail Salganik, Jerilynn Radcliffe, Robert L. Jones, N. Beth Ragan, J. Julian Chisolm, and George G. Rhoads. The effect of chelation therapy with succimer on neuropsychological development in children exposed to lead. The New England journal of medicine, 344 19:1421-6, May 2001. URL: https://doi.org/10.1056/nejm200105103441902, doi:10.1056/nejm200105103441902. This article has 493 citations and is from a highest quality peer-reviewed journal.
(rogan2001theeffectof pages 3-5): Walter J. Rogan, Kim N. Dietrich, James H. Ware, Douglas W. Dockery, Mikhail Salganik, Jerilynn Radcliffe, Robert L. Jones, N. Beth Ragan, J. Julian Chisolm, and George G. Rhoads. The effect of chelation therapy with succimer on neuropsychological development in children exposed to lead. The New England journal of medicine, 344 19:1421-6, May 2001. URL: https://doi.org/10.1056/nejm200105103441902, doi:10.1056/nejm200105103441902. This article has 493 citations and is from a highest quality peer-reviewed journal.
(whitledge2024trendsinshortages pages 4-5): James D. Whitledge, Pelayia Soto, Kieran M Glowacki, D. Calello, Erin R Fox, and M. Mazer-Amirshahi. Trends in shortages of lead chelators from 2001 to 2022. The journal of pediatric pharmacology and therapeutics : JPPT : the official journal of PPAG, 29 3:306-315, Jun 2024. URL: https://doi.org/10.5863/1551-6776-29.3.306, doi:10.5863/1551-6776-29.3.306. This article has 7 citations.
(porterfield2024asnapshotof pages 3-5): Kate Porterfield, Paromita Hore, Stephen G. Whittaker, Katie M. Fellows, Anshu Mohllajee, Shakoora Azimi-Gaylon, Berna Watson, Isabel Grant, and Richard Fuller. A snapshot of lead in consumer products across four us jurisdictions. Environmental Health Perspectives, Jul 2024. URL: https://doi.org/10.1289/ehp14336, doi:10.1289/ehp14336. This article has 10 citations and is from a highest quality peer-reviewed journal.
(stangle2004reductionsinblood pages 5-6): Diane E Stangle, Myla S Strawderman, Donald Smith, Mareike Kuypers, and Barbara J Strupp. Reductions in blood lead overestimate reductions in brain lead following repeated succimer regimens in a rodent model of childhood lead exposure. Environmental Health Perspectives, 112:302-308, Mar 2004. URL: https://doi.org/10.1289/ehp.6517, doi:10.1289/ehp.6517. This article has 41 citations and is from a highest quality peer-reviewed journal.
(whitledge2024trendsinshortages pages 1-2): James D. Whitledge, Pelayia Soto, Kieran M Glowacki, D. Calello, Erin R Fox, and M. Mazer-Amirshahi. Trends in shortages of lead chelators from 2001 to 2022. The journal of pediatric pharmacology and therapeutics : JPPT : the official journal of PPAG, 29 3:306-315, Jun 2024. URL: https://doi.org/10.5863/1551-6776-29.3.306, doi:10.5863/1551-6776-29.3.306. This article has 7 citations.
(whitledge2024trendsinshortages pages 2-4): James D. Whitledge, Pelayia Soto, Kieran M Glowacki, D. Calello, Erin R Fox, and M. Mazer-Amirshahi. Trends in shortages of lead chelators from 2001 to 2022. The journal of pediatric pharmacology and therapeutics : JPPT : the official journal of PPAG, 29 3:306-315, Jun 2024. URL: https://doi.org/10.5863/1551-6776-29.3.306, doi:10.5863/1551-6776-29.3.306. This article has 7 citations.
(whitledge2024trendsinshortages pages 8-10): James D. Whitledge, Pelayia Soto, Kieran M Glowacki, D. Calello, Erin R Fox, and M. Mazer-Amirshahi. Trends in shortages of lead chelators from 2001 to 2022. The journal of pediatric pharmacology and therapeutics : JPPT : the official journal of PPAG, 29 3:306-315, Jun 2024. URL: https://doi.org/10.5863/1551-6776-29.3.306, doi:10.5863/1551-6776-29.3.306. This article has 7 citations.
(lanphear2024leadpoisoning. media 5797edb2): Bruce Lanphear, Ana Navas-Acien, and David C. Bellinger. Lead poisoning. The New England journal of medicine, 391 17:1621-1631, Oct 2024. URL: https://doi.org/10.1056/nejmra2402527, doi:10.1056/nejmra2402527. This article has 68 citations and is from a highest quality peer-reviewed journal.

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Phenotypes

Medical Actions

Environmental Factors

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Differential Diagnoses

Related Datasets

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References

Deep Research

Lead Poisoning (Plumbism): Disease Characteristics Research Report

1. Disease Information

Overview / current understanding

Key identifiers (OMIM / Orphanet / ICD / MeSH / MONDO)

Synonyms / alternative names

Evidence source type

2. Etiology

Disease causal factors

Risk factors

Protective factors

Gene–environment interactions

3. Phenotypes

Core clinical manifestations (symptoms/signs/labs)

Age of onset, severity, progression

Suggested HPO terms (non-exhaustive; derived from described phenotypes)

4. Genetic / Molecular Information

Causal genes

Modifier genes / susceptibility loci (examples in retrieved evidence)

Epigenetic information

5. Environmental Information

Environmental factors and real-world exposure sources

Lifestyle factors

6. Mechanism / Pathophysiology

Toxicokinetics and causal chain (trigger → biology → phenotype)

Suggested ontology terms

7. Anatomical Structures Affected

8. Temporal Development

Onset patterns

Critical windows

9. Inheritance and Population

Epidemiology and burden (selected statistics)

Population disparities

10. Diagnostics

Clinical tests / biomarkers

Screening / thresholds (as supported in retrieved evidence)

11. Outcome / Prognosis

12. Treatment

Core treatment principles

Chelation therapy

Evidence base (children with moderate BLLs)

Severe poisoning / encephalopathy

Real-world implementation constraints: chelator shortages

Suggested MAXO terms (to be verified)

13. Prevention

Primary prevention

Secondary prevention: screening/testing

Public health interventions in practice

14. Other Species / Natural Disease

15. Model Organisms

Key quantitative summary tables

Notes on evidence gaps and identifier limitations

Source figure (visual evidence)