The C3 Complement Serum Test measures the levels of C3 complement, a protein in the immune system that plays a crucial role in defending the body against infections. This test helps evaluate the immune system’s ability to respond to infections and detect autoimmune or inflammatory disorders. The test is often ordered alongside the C4 Complement Test to gain a complete understanding of immune function.

Low C3 Levels: May indicate autoimmune diseases such as lupus or rheumatoid arthritis, or certain infections. High C3 Levels: Suggest active inflammation, infection, or other immune responses. Conditions Monitored: Autoimmune diseases (e.g., lupus, rheumatoid arthritis) Immune system disorders Infections or inflammation

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