C1Q (COMPLEMENT C1Q)
1 SST/1.0 mL serum. Spin and separate serum from gel within 1 hour of collection.
Room Temp 4 days; Refrigerated 10 days
3-5 days Performed Mon, Wed
Evaluate the classical complement pathway. C1q can be very low in hypocomplementemic urticarial vasculitis, severe combined immunodeficiency with agammaglobulinemia and x-linked hypogammaglobulinemia. C1q concentrations in patients with rheumatoid arthritis (RA) may be useful as a prognosticator of articular erosions.