Update of the Blood Lead Reference Value — United States, 2021

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What is already known about this topic?
No safe blood lead level (BLL) in children exists. Even low levels cause harm.
What is added by this report?
CDC updated the blood lead reference value (BLRV) to 3.5 μg/dL, which provides an opportunity for additional progress in addressing longstanding disparities in lead exposure and BLLs in children.
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Photo credit: CDC

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