C1 Esterase Inhibitor Activity

Additional Information:

UFHPL Epic order code: LAB850

CPT Code(s):


Collection Procedure:

Specimen: Serum

Volume: 1 mL

Container: Red-top tube or gel-barrier tube

Collection: Separate serum from cells within 30 to 60 minutes after collection. Transfer specimen to a plastic transport tube.

Storage Instructions: Maintain specimen at room temperature.


C1 esterase inhibitor is decreased in hereditary angioneurotic edema; decrease may be functional or quantitative


Immunologic, quantitative


2 – 4 days

Reference Values:

21−39 mg/dL