Complement C3 analysis (Complement C3, Serum) is a medical test used to evaluate the levels of C3 protein in the blood, which is an essential component of the immune complement system. C3 protein plays a vital role in enhancing the immune response by helping activate immune cells and eliminate pathogens and foreign substances. This test is used to diagnose and monitor a range of health conditions, such as inflammatory diseases, autoimmune disorders, and infections. Elevated or decreased C3 levels may indicate certain immune system disorders, assisting physicians in determining an appropriate treatment plan. It is important to perform this test as part of a comprehensive assessment of the patient’s condition, alongside other tests when needed.