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8369M
C4 (FOURTH COMPONENT OF COMPLEMENT), BODY FLUID

Test Code 8369M 
Test C4 (FOURTH COMPONENT OF COMPLEMENT), BODY FLUID 
Methodology Nephelometry 
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 1.0 mL (minimum: 0.5 mL) of body fluid or synovial fluid. Send specimen refrigerated in a screw-capped, plastic vial.

NOTE: INDICATE SOURCE OF SPECIMEN ON REQUEST FORM. 

Reference Values No established reference values 
Analytic Time 1 Day 
Day(s) Test Set Up Monday through Saturday 
CPT Code(s) 86160