C4 Level
Alternate Names : C4
Definition C4 level is a test that measures the concentration of a component of the complement system in the blood.
Why is the Test Performed?
Complement activity (CH50, CH100, terminal complement component, or individual complement proteins) is measured to determine if complement is involved in the development of a disease. Complement activity is also measured to monitor how severe a disease is, or if treatment is working.
For example, patients with active systemic lupus erythematosus may have lower-than-normal levels of C3 and C4, and these component levels may be monitored as a rough index of disease activity.
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