Biomonitoring measures the amount of specific chemicals in a person's body at a given time. It can be used to determine the type of chemical exposure a person has experienced but often not the exact source of contamination. For example, biomonitoring can detect lead in blood, but will not indicate how or where the person was exposed to lead. When samples are collected broadly and systematically, biomonitoring data can help identify and track trends, such as geographic regions with higher than normal exposure levels, or exposures to emerging contaminants. It can also let us know when exposure is no longer a concern, perhaps as the result of a public health intervention.
National Biomonitoring Network