The Complement C3 (B1C) test measures the level of C3 protein, a crucial component of the immune system, in the blood. This test is essential for diagnosing and monitoring autoimmune disorders, including lupus and rheumatoid arthritis. A 1 ml serum specimen is required for this test, which provides results in 2 days. Priced at 850 THB, it helps understand the activity of the complement system in the body, aiding in the diagnosis and treatment of autoimmune conditions.