Used in clinical and research laboratories to quantify free erythrocyte protoporphyrin (FEP) levels in whole blood. This kit is particularly valuable in the assessment of iron deficiency, especially in populations where early detection is critical, such as in children and pregnant women. It also supports the diagnosis and monitoring of lead poisoning, as elevated FEP levels are a sensitive indicator of lead exposure due to inhibition of ferrochelatase enzyme activity. The ELISA format allows for high-throughput, accurate, and reproducible measurement without the need for radioactive materials or complex instrumentation like HPLC. Widely applied in epidemiological studies, environmental health screenings, and occupational medicine to evaluate iron metabolism and toxic metal exposure.