24-72 hours after setup at PeaceHealth Laboratories’ reference lab.
CPT Code:
86160-90
Specimen Collection Details
Collection:
One 5 mL red top tube. DO NOT use gel barrier tube. Also acceptable: One 4 mL lavender top tube (EDTA).
Handling:
Allow to clot, centrifuge and separate serum or plasma from cells into a plastic vial. Refigerate.
Stability:
7 days ambient, 14 days refrigerated, or 2 months frozen.
Standard Volume:
1 mL serum or plasma.
Minimum Volume:
0.5 mL serum or plasma.
Transport:
Refrigerated.
Comments:
Evaluate the classical complement pathway. C1q can be very low in hypocomplementemic urticarial vasculitis, severe combined immunodeficiency with agammaglobulinemia and x-linked hypogammaglobulinemia. C1q concentrations in patients with rheumatoid arthritis (RA) may be useful as a prognosticator of articular erosions.
Rejection Criteria:
Gel barrier tubes are not acceptable as they interfere with the assay methodology.
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