CPT® Code 84202

The CPT® Code 84202 refers to a quantitative measurement of protoporphyrin levels in red blood cells (RBC). This blood test is essential for assessing the concentration of protoporphyrins, which are biochemical carrier molecules involved in the heme biosynthesis pathway. Protoporphyrins can accumulate in the body due to genetic disorders affecting heme production or as a result of exposure to lead. The test is particularly relevant for diagnosing conditions associated with elevated protoporphyrin levels, such as certain types of anemia, including iron deficiency anemia, sickle cell anemia, and sideroblastic anemia. Additionally, elevated levels may indicate lead poisoning or exposure to vanadium. The code can also be utilized to report levels of zinc protoporphyrins or erythrocyte porphyrins, both of which are critical in understanding various hematological conditions. The testing process involves obtaining a blood sample through venipuncture, which is a separately reportable procedure. The analysis of whole blood for zinc protoporphyrin is conducted using quantitative hematofluorometry, while erythrocyte porphyrin levels are measured through quantitative extraction and fluorometry techniques. This comprehensive approach allows for accurate diagnosis and management of conditions related to protoporphyrin metabolism.