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Test Code C1ESTER FN C 1 Esterase Inhibitor Function

Clinical System Name

C1 Esterase Inhibitor Function


C1 Esterase Inhibitor Functional Assay

Sample Requirements

Specimen: Whole blood

Container(s): Gold SST or Red or Gold Microtainer

Preferred Vol: 2.0 mL

Minimum Vol: 1.2 mL


Note: Send to the Lab STAT. Serum  must be frozen within one hour of collection.

Processing Instructions

Reject due to

Spin: Y

Aliquot: Y

Temp: -70 C

Storage location: Serum must be frozen within 1 hour of blood draw. Spin blood, freeze 0.5 mL serum in a plastic tube affixed with a large computer label. Freeze in the -70° C freezer send-outs rack. Store remaining labels in the clear plastic box on the CPA fridge.


Off-site collection: Spin, aliquot & freeze serum within one hour of blood draw. Transport frozen.


Specimen Type Temperature Time
  Room temp N
  Refrigerated N
  Frozen 2 w



STAT Performed TAT
N Collected daily; set up Th 2 - 8 d


Performing Laboratory

University of Washington

Dept of Laboratory Medicine

1959 NE Pacific St, NW220
Seattle, WA 98195

Phone Number: (206) 520-4600


Department:  Send Outs


Phone Number: (206) 987-2563



Reference Range


Decreased Function <41%
Normal Function >68%
Equivocal 41 - 68%




Method: None ELISA

Analytical Volume: None specified


CPT Codes



Send Out Instructions


Reference Test Name: C1 Esterase Inhibitor Functional Assay
Reference Test Number: C1EF
Instructions: Send out M - F with the UW courier.