Complement Component 2

Test Code

Alias/See Also
C2, C2 Level, Second component of complement, complement classical pathway, Classical Pathway - Complement, C2 Antigen, 0050148

CPT Codes

Preferred Specimen
1 Gold SST

Minimum Volume
0.3 mL

Allow specimen to clot for 1 hour at room temp.  Separate serum from cells ASAP or within 2 hours of collection.  Transfer 1mL serum to an ARUP Standard Transport Tube and freeze immediately.

Transport Container
ARUP Standard Transport Tube

Transport Temperature
CRITICAL FROZEN.  Separate specimens must be submitted with multiple tests are ordered.

Specimen Stability
15-30C up to 2 hours
2-8C up unacceptable
-20C up to 2 weeks

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Non-frozen specimens.  Specimens exposed to repeated freeze/thaw cycles.  Specimens left to clot at refrigerated temperature.

Quantitative Radial Immunodiffusion

FDA Status

Setup Schedule
Mon, Thur

Report Available
5-10 days

Reference Range
1.6 - 4.0 mg/dL

Clinical Significance
Follow-up test for complement activity screening when CH50 is low or absent and AH50 is normal and high suspicion remains for complement deficiency.

Performed By
Alverno Laboratories

Performing Laboratory
ARUP Laboratories
Test code: 0050148

Last Updated: May 16, 2023

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.