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Complement 4

Message
C4 is utilized only by the classical complement pathway, so that it is decreased only when this pathway is activated. Measurements of this protein aids in the diagnosis of immunologic disorders.


Test Code
COMP4


Alias/See Also
C4


CPT Codes
86160

Preferred Specimen
1mL serum, collected in a gold serum separator tube (SST)


Minimum Volume
0.5mL serum


Specimen Stability
Store centrifuged samples tightly stoppered at room temperature 15 - 30oC for no longer than four hours.  If the assay will not be completed within four hours, refrigerate the samples at 2 - 8oC or freeze serum at -20oC or colder.


Setup Schedule
Daily


Report Available
Next Day


Reference Range
13 - 50mg/dL


Performing Laboratory
Penn Medicine Lancaster General Health 



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.