Anti-C1Q Ab, IgG

Test Code: 458
CPT Codes: 83520
Methodology: EIA
Specimen Requirements: 1 mL serum, ambient, refrigerated or frozen
Turn Around Time: 5 -7 Days
Special Instructions: Weak Positive: 20-39 Units;  Moderate Positive: 40-80 Units;  Strong Positive: >80 Units
Clinical Utilities: 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 of immune complexes.