C4a des-Argenine Complement Component

Test Code

C4a

Quest Code

19956

Alias/See Also

C4a

CPT Codes
86160

Preferred Specimen

1 mL frozen plasma collected in an EDTA (lavender-top) tube
Pediatric volume: 0.5 mL minimum

Minimum Volume

0.5 mL

Instructions

Centrifuge at room temperature within one half hour of collection; preferably immediately after venipuncture. Transfer the cell-free plasma to a clean tube and store immediately at -20°C, then transfer to dry ice for shipment within 6 hours or immediately freeze on dry ice or at -70°C or below. Send frozen plasma Priority Overnight via FedEx and in a well insulated container on dry ice.

Transport Container

Plastic screw-cap vial

Transport Temperature

Frozen

Specimen Stability

Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen -20° C: 6 hours
Frozen -70° C: 1 year

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Received room temperature • Received refrigerated • Received thawed

Methodology
Radioimmunoassay (RIA)

Setup Schedule

Set up: 1st and 3rd Thurs of the month; Report available: 18 days

Reference Range

0-2830 ng/mL

Performing Laboratory
National Jewish Medical and Research Center
1400 Jackson Street
Denver, CO 80206

Last Updated: August 15, 2019

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.