COMPLEMENT 3 (C3)

The complement 3 (C3) test measures the level of C3, a protein component of the complement system, in the blood. The complement system is part of the immune response and helps fight infections. The C3 test is used to diagnose and monitor autoimmune and inflammatory conditions, such as systemic lupus erythematosus (SLE), rheumatoid arthritis, and kidney diseases. Low levels of C3 can indicate an active immune response or complement system deficiency. The test is valuable for assessing immune function, diagnosing underlying conditions, and guiding treatment decisions for autoimmune and inflammatory diseases.