The Bureau of Laboratories of the Pennsylvania Department of Health participates in a Childhood Lead Poisoning Detection Program which tests blood to determine exposure levels as well as environmental samples (dust wipes, soil, and paint chips) to identify sources of exposure. A requirement for greater sensitivity in environmental testing has resulted in a change from an acetylene flame AAS to an ICP-OES analytical procedure. This poster summarizes this biomonitoring program and compares and contrasts AAS vs. ICP-OES as methods for determining lead levels in dwellings where children with elevated blood lead concentrations live.