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Test Code: 8

Cpt Code:

86160 (x1)

Clinical Utility

C4 is a component of the complement system, and has a fundamental role in the inflammatory response and immune system functionality. Diagnosis cannot be made and treatment must not be given on the basis of C4 measurements alone. Clinical history and other laboratory findings must be taken into account.


Turbidimetry using specific antiserum to C4. This test has been cleared or approved for diagnostic use by the U.S. Food and Drug Administration.

Turnaround Time

7 days

Specimen Information

serum - 1 mL, ambient, no special shipping requirements.


Specimens are approved for testing in New York only when indicated in the Specimen Information field above.

The CPT codes provided are based on Viracor-IBT's interpretation of the American Medical Association's Current Procedural Terminology (CPT) codes and are provided for general informational purposes only. CPT coding is the sole responsibility of the billing party. Questions regarding coding should be addressed to your local Medicare carrier. Viracor-IBT assumes no responsibility for billing errors due to reliance on the CPT codes illustrated in this material.

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