Individual test · Labcorp 004330

Complement C4a

This test measures Complement C4a, a protein released when your immune system is activated. It helps show whether your body is reacting with inflammation to a trigger, such as an infection or an autoimmune issue. Doctors use this result to evaluate immune system activity and monitor inflammatory conditions. However, because C4a levels rise in many different situations, this test cannot diagnose a specific disease or pinpoint the exact cause of the inflammation on its own.