Related Experiment Video

Updated: Aug 5, 2026

Experimental Protocol for Using Drosophila As an Invertebrate Model System for Toxicity Testing in the Laboratory
06:00

Experimental Protocol for Using Drosophila As an Invertebrate Model System for Toxicity Testing in the Laboratory

Published on: July 10, 2018

IQ following treatment of lead poisoning: a patient-sibling comparison

H K Sachs, V Krall, D A McCaughran

    The Journal of Pediatrics
    |September 1, 1978
    PubMed

    Insights

    Children treated for lead poisoning showed no significant cognitive differences compared to their siblings. Even with elevated blood lead levels, intelligence tests did not distinguish treated children from controls.

    Area of Science:

    • Pediatric toxicology
    • Neuropsychology

    Background:

    • Lead poisoning is a significant public health concern in children.
    • Elevated blood lead levels (PbB) can impact cognitive development.

    Purpose of the Study:

    • To assess the long-term cognitive effects of treated lead poisoning in children.
    • To compare neuropsychological outcomes between children treated for lead poisoning and their healthy siblings.

    Main Methods:

    • A cohort of 47 children treated for lead poisoning (PbB 50-365 microgram/dL) was evaluated.
    • Psychological tests, including intelligence and arithmetic subtests, were administered.
    • Patients were compared to sibling controls with PbB < 40 microgram/dL.

    Main Results:

    • No significant differences in overall intelligence test scores were found between treated children and controls.
    • A specific deficit in the arithmetic subtest was observed in patients, unrelated to lead concentration.
    • Physical and neurological examinations showed no residual damage in the treated group.

    Conclusions:

    • Successful treatment of lead poisoning may prevent severe long-term cognitive deficits.
    • Subtle arithmetic difficulties may persist despite treatment and normal neurological status.
    • Intelligence testing may not fully capture the impact of lead exposure on cognitive function.

    More Related Videos

    Positron Emission Tomography Using 64-Copper as a Tracer for the Study of Copper-Related Disorders06:52

    Positron Emission Tomography Using 64-Copper as a Tracer for the Study of Copper-Related Disorders

    Published on: April 28, 2023

    Rearing the Cabbage White Butterfly (Pieris rapae) in Controlled Conditions: A Case Study with Heavy Metal Tolerance08:08

    Rearing the Cabbage White Butterfly (Pieris rapae) in Controlled Conditions: A Case Study with Heavy Metal Tolerance

    Published on: August 18, 2023

    Related Concept Videos

    Precipitation Reactions03:10

    Precipitation Reactions

    In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
    Extraction: Advanced Methods00:56

    Extraction: Advanced Methods

    Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
    Toxicity Testing in Animals01:23

    Toxicity Testing in Animals

    Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...