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C4
COMPLEMENT C4, SERUM

Test Code C4 
Test COMPLEMENT C4, SERUM 
Methodology Turbidimetric Immunoassay 
Description Useful for investigating an undetectable total complement (CH50) level, confirming hereditary angioedema, and assessing disease activity in systemic lupus erythematosus, proliferative glomerulonephritis, rheumatoid arthritis, and autoimmune hemolytic anemia. 
Specimen Draw blood in either a plain, red-top tube or serum gel tube. Spin down and send 0.5 mL (minimum volume: 0.3 mL) of serum refrigerated. 
Reference Values 10.0 - 40.0 mg/dL 
Analytic Time 1 Day 
Day(s) Test Set Up Monday through Sunday 
CPT Code(s) 86160