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C4 COMPLEMENT

Message
Collect a full tube, following standard venipuncture techniques.


Test Code
LAB151 C4


Alias/See Also
C4


CPT Codes
86160

Instructions
Processing Instructions (Lab use only): Ensure complete clot formation has taken place prior to centrifugation.Specimens from patients receiving anticoagulant or thrombolytic therapy may take longer to complete their clotting processes. Fibrin clots may form in these sera and the clots could cause erroneous test results. Centrifuge and separate cells after clot formation and within 4 hours of collection. Minimum Testing Volume: 0.25 mL Serum Transport Temperature: Refrigerated Stability: Ambient: N/A Refrigerated : 2 daysFrozen: N/A Causes for Rejection: Unlabeled, mislabeled, wrong tube type, hemolyzed, visually lipemic, QNS, exceeds specimen/stability requirements.


Clinical Significance
1230130085



Last Updated: May 18, 2026


The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.