A 3-year-old child with basophilic stippling on CBC suggests poisoning with which element?

A 3-year-old child with basophilic stippling on CBC suggests poisoning with which element?

• A. Arsenic
• B. Iron
• C. Mercury
• D. Lead

Answer: (D)

Basophilic stippling reflects disruption of red cell maturation caused by a toxin that blocks heme synthesis. Lead inhibits two enzymes in the heme pathway—ALA dehydratase and ferrochelatase—so heme production stalls and ribosomal RNA remnants accumulate in developing red cells, showing up as tiny blue dots on the smear. In a young child, this pattern is a classic sign of lead poisoning from environmental exposure (e.g., lead paint dust). While other toxins can cause various effects, the basophilic stippling pattern is most strongly linked to lead, making it the best explanation for this CBC finding.

Basophilic stippling reflects disruption of red cell maturation caused by a toxin that blocks heme synthesis. Lead inhibits two enzymes in the heme pathway—ALA dehydratase and ferrochelatase—so heme production stalls and ribosomal RNA remnants accumulate in developing red cells, showing up as tiny blue dots on the smear. In a young child, this pattern is a classic sign of lead poisoning from environmental exposure (e.g., lead paint dust). While other toxins can cause various effects, the basophilic stippling pattern is most strongly linked to lead, making it the best explanation for this CBC finding.