**Note: All laboratory testing requires an authorizing physician. DHA Laboratory offers a Patient Direct Program that partners you with an authorizing physician. If you have any additional questions regarding the availability of testing, please contact our laboratory by telephone or email.**
C3a is a 77 residue anaphylatoxin that binds to the C3a receptor, a class A G protein-coupled receptor. It plays a large role in the immune response as well as in adaptive immunity, moderating leukocyte production and proliferation.
Patient Preparation: No radioactive isotopes administered within 48 hours prior to venipuncture.