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Test Code
AC1QG
Test Name
Anti-C1q Antibody, IgG
CPT Codes
83516
Expected Turnaround Time
7 - 14 days
Clinical Utility

Serial testing shows that increasing amounts of IgG anti-C1q predict renal flares in SLE patients. Elevated serum titers of anti-C1q antibodies tend to be associated with proliferative forms of lupus, glomerulonephritis and subendothelial deposits of immune complexes.
Specimen and Container Info

Specimen Type: Serum

  

Collection Container: Gold Top, Serum Separator

Alternate Collection Container: Red Top, Plain

Desired Specimen Volume: 1 mL
Collection Instructions
  1. Collect a gold top, serum separator tube via venipuncture.
Processing and Submission Instructions
  1. Separate serum from cells within one hour of collection.
  2. Transfer 1 mL of serum to a clear aliquot tube (screw cap).
Transport Instructions

Transport to the laboratory refrigerated. 
Stability Requirements

Room Temperature

7 days

Refrigerated

14 days

Frozen

60 days

Freeze/Thaw Cycles

Stable x1
Causes for Rejection
  • Grossly hemolyzed
  • Bacterial contamination
  • Lipemic specimen
  • Icteric specimen
  • Non-serum specimen types
Methodology
ELISA
Reference Intervals

See patient report.

Reference Lab
Labcorp Of America Holdings
Testing Schedule
Routine, 2 times per week
The American Medical Association (AMA) Current Procedural Terminology (CPT) codes published by HNL Lab Medicine are guidelines and are intended for informational purposes only. CPT coding is the exclusive responsibility of the billing entity. View the Terms.
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