Complement C4 (Nephelometry)
Sample: Serum
Schedule: Daily
Units: mg/dL
Range: 16 - 41
Remarks: C4 is utilized only by the classical complement pathway and is used in monitoring autoimme diseases activity. Congenital C4 deficiency may be associated with compromise of the immune system. It is particularly useful to assess disease activity in autoimmune diseases (C4 is decreased in SLE). High C4 levels may indicate activation of the immune system. Some cases of autoimmune hemalytic anemia causes increase of C4..
