![]() ![]() The value of 3.5 μg/dL was derived from NHANES data from the 18 cycles. Every four years, CDC reanalyzes blood lead data from the most recent two NHANES cycles to determine whether the reference value should be updated. and determine the prevalence of major diseases and risk factors for diseases. NHANES is a population-based survey to assess the health and nutritional status of adults and children in the U.S. Children with blood lead levels at or above the BLRV represent those at the top 2.5% with the highest blood lead levels. children ages 1-5 years from 18 National Health and Nutrition Examination Survey (NHANES) cycles. This level is based on the 97.5th percentile of the blood lead values among U.S. ![]() In 2012, the Centers for Disease Control and Prevention (CDC) introduced a blood lead “reference value” to identify children with higher levels of lead in their blood compared to most children. ![]() CDC uses a blood lead reference value (BLRV) of 3.5 micrograms per deciliter (µg/dL) to identify children with blood lead levels that are higher than most children’s levels. ![]()
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