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.
Gold serum separator (SST) tube
Ambient - OK
Frozen - OK
Enzyme Immunoassay (EIA)
< 20 Units