(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