C1 Esterase Inhibitor, Functional
Draw blood in a red-top tube. Centrifuge, separate and send 1.0 mL serum (0.2 mL minimum) frozen in a screw-capped plastic vial. CRITICAL FROZEN. Sample may not be shared for other testing.
Frozen: 2 months
C1 esterase inhibitor is decreased in hereditary angioneurotic edema; disease may be functional or quantitative.