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
The results of the blood test for C3 and C4 complement help monitor
the condition of people who have kidney disease (nephritis) or
lupus. The results can also help diagnose
angioedema, an allergic reaction.
Primary Medical Reviewer
Anne C. Poinier, MD - Internal Medicine
Specialist Medical Reviewer
Tushar J. Vachharajani, MD, FASN, FACP - Nephrology
How this information was developed to help you make better health decisions.