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(Normal range: 90-180 mg/dL (0.9-1.8 g/L

Comment: Quantitation of C3 is used to detect individuals with a congenital deficiency or those with immunologic disease in whom complement is consumed at an increased rate. These include chronic hepatitis, certain chronic infections (including hepatitis C virus associated cryoglobulinemic vasculitis), immune complex disease, post streptococcal and membranoproliferative glomerulonephritis, and others. It is especially useful to assess disease activity in lupus erythematous SLE

Sample: Serum, in ice