C1q Complement (981)11236

Test Code
C1q (981)

Quest Code

CPT Codes

Preferred Specimen
1 mL serum

Minimum Volume
0.1 mL

Other Acceptable Specimens
Plasma collected in: EDTA (lavender-top) tube or PPT (white-top) tube

Separate serum within one hour of draw time and refrigerate. Can be drawn in a gel barrier tube but needs to be separated within one hour from time drawn.

Transport Temperature
Refrigerated (cold packs)

Specimen Stability
Room temperature: 4 days
Refrigerated: 10 days
Frozen: 29 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Grossly lipemic

Radial Immunodiffusion (RID)

FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Setup Schedule
Mon, Wed

Report Available
4 to 9 Day(s)

Reference Range
5.0-8.6 mg/dL

Clinical Significance
The complement system is critical to the inflammatory response.  C1q concentrations may be decreased in patients with acquired angioedema, immune complex induced vasculitis, and concurrent low concentrations of C1 inhibitor, carcinoma, or lymphoma.

Performing Laboratory
Quest Diagnostics Nichols Institute San Juan Capistrano
33608 Ortega Hwy
San Juan Capistrano, CA 92675-2042

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.