About the National Data
Baseline: 3.31 micrograms per deciliter (µg/dL) was the concentration level of lead in blood samples at which 97.5 percent of the population aged 1 to 5 years was at or below in 2013-16
Target: 1.18 µg/dL
Blood lead measurement is the preferred method of evaluating lead exposure and its human health effects. Blood lead levels reflect both recent intake and equilibration with stored lead in other tissues, particularly in the skeleton. Urine levels may reflect recently absorbed lead, though there is greater individual variation in urine lead than in blood and greater potential for contamination.
Reference: CDC Biomonitoring Summary for Lead
1. Because Healthy People 2030 objectives have a desired direction (e.g., increase or decrease), the confidence level of a one-sided prediction interval can be used as an indication of how likely a target will be to achieve based on the historical data and fitted trend.