Abstract
A blood lead survey was conducted on samples from 2459 children aged 3–6 years to determine the prevalence of lead poisoning in children of this age in the Province of Ontario. Lead poisoning, defined as a blood lead concentration ⩾ 1.21 μmol l −1 (25 μg dl −1), was found in 26 subjects (1.1% of the samples). The mean blood lead concentration for children from southern Ontario was 0.50 μmol l −1, and for those from northern Ontario it was 0.37 μmol l −1. Stringent quality controls and independent cross-checks of finger-prick capillary blood sampling were employed in the study. The free erythrocyte protoporphyrin levels were also monitored to detect the presence of iron deficiency in the children.
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