Lead levels in the body are primarily measured using blood lead level (BLL) tests. The CDC identifies a BLL of 5 micrograms per deciliter (µg/dL) or higher as a level of concern in children. However, no safe level of lead exposure has been identified, and even levels below this threshold can be harmful. For environmental assessments, lead levels in soil, water, and dust are also measured to identify potential sources of exposure.
