Complement component 3

Alternative names:

C3

Normal values:

The normal range is 75 to 135 mg/dl.

Note: mg/dl = milligrams per deciliter

What abnormal results mean:

Increased complement activity may be seen in:

• cancer
• ulcerative colitis

Decreased complement activity may be seen in:

• hereditary angioedema
• bacterial infections (especially Neisseria)
• cirrhosis
• glomerulonephritis
• hepatitis
• lupus nephritis
• malnutrition
• renal transplant rejection
• systemic lupus erythematosus