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C3 and C4 complement

C3 and C4 complement are parts of a group of globulin proteins found in the blood. Globulins carry substances through the bloodstream. C3 and C4 complement help the body's immune system react to inflammation and infection.

The results of the blood test for C3 and C4 complement help monitor the condition of people with kidney disease (nephritis) or lupus. The results can also help diagnose angioedema, an allergic reaction.

Author Monica Rhodes
Editor Kathleen M. Ariss, MS
Associate Editor Pat Truman
Primary Medical Reviewer E. Gregory Thompson, MD
- Internal Medicine
Specialist Medical Reviewer D.C. Mendelssohn, MD, FRCPC
- Nephrology
Last Updated June 13, 2007

WebMD Medical Reference from Healthwise

Last Updated: June 13, 2007
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