The C4 Complement Serum Test measures the levels of the C4 protein, a part of the complement system that helps the immune system fight infections and manage inflammation. Low levels of C4 may indicate autoimmune or inflammatory conditions such as lupus or rheumatoid arthritis, while elevated levels can signify acute inflammation. This test is essential for diagnosing immune deficiencies and monitoring the progression of autoimmune diseases.

Low C4 Levels: May indicate lupus, hereditary angioedema, or other immune-related disorders. High C4 Levels: Suggest acute inflammation or infection. Conditions Monitored: Systemic lupus erythematosus (SLE) Hereditary angioedema Autoimmune and inflammatory disorders

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