Lead is a toxic heavy metal that can cause serious health problems, especially in children. Blood testing for lead is necessary to identify exposure levels and assess the potential health risks. Children are particularly vulnerable to lead poisoning, which can impair growth, development, and cognitive function. Testing helps identify sources of lead exposure, such as contaminated water or lead-based paint, and enables timely interventions to reduce exposure. Adults working in lead-related industries or living in older homes should also undergo testing to ensure their safety and well-being.