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Is there a need for systematic blood lead screening in Canadian children?
P Levallois1, P Gaudreault, M Rhainds
1Département de médecine sociale et préventive, Faculté de médecine, Université Laval, Québec.
Insights
Systematic blood lead level screening is not recommended for young Canadian children. Case-finding is advised for symptomatic children, with population surveys for known environmental lead sources.
Area of Science:
- Environmental Health
- Pediatrics
- Toxicology
Background:
- Neuropsychological effects in children exposed to low blood lead levels are increasingly understood.
- Subclinical lead poisoning poses risks to young children's development.
Purpose of the Study:
- To review the evidence for systematic blood lead level screening in young Canadian children.
- To determine the appropriateness of current screening practices in Canada.
Main Methods:
- Systematic review of existing criteria for screening appropriateness.
- Analysis of the need for universal versus targeted screening approaches.
Main Results:
- No evidence supports systematic blood lead level screening for all young Canadian children.
- Case-finding in clinical settings is recommended for children with suggestive symptoms or known exposure.
- Population surveys are recommended only when a community environmental lead source is documented.
Conclusions:
- Routine systematic screening for subclinical lead poisoning is not warranted in Canada.
- Targeted screening and environmental remediation are key strategies.
- Further research is needed on persistent lead sources and cost-effective remediation.
Abstract:
Neuropsychological effects occurring in young children exposed to low blood lead levels are now better known. This paper reviews the need to systematically screen for blood lead levels compatible with subclinical lead poisoning in young Canadian children. Using standard criteria for judging the appropriateness of this measure, the authors found no evidence to support such a practice in Canada. Case-finding is recommended in clinical settings for children with disorders suggestive of lead poisoning, increased lead absorption or exposure to a potential source of lead. A population survey is also recommended in the presence of a well-documented community environmental lead source. There is a need for common protocols across Canada for evaluating and treating children with blood lead levels compatible with subclinical poisoning. Areas of priority research are: the impact of persistent environmental sources of lead such as old paint and lead in water; defining criteria for selective screening; and methods of cost-effective environmental remediation.