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C1 Esterase Inhibitor Protein

Test Code: 1113
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Clinical and Procedure
Clinical Utility

C1 esterase inhibitor (inactivator) deficiency is the most common of the inherited complement component deficiencies. It is the cause of hereditary angioedema. Two types exist: type I, in which reduced serum levels of functionally active C1 inactivator occur, and type II, in which normal or even elevated levels of functionally inactive C1 inactivator are present.


Turbidimetry using specific antiserum to C1 Inactivator. This test has been cleared or approved for diagnostic use by the U.S. Food and Drug Administration.

Turnaround Time

7 business days from receipt of specimen

Specimen Information
Specimen Type Order Code CPT Code NY Approved Volume Assay Range Special Instructions
serum 1113 86160 Yes

1 mL (min. 100 uL)

6-80 mg/dL

  • Collect 1 mL, fresh serum.
  • Ship frozen overnight on dry ice.

Specimens are approved for testing in New York only when indicated in the Specimen Information field above.

The CPT codes provided are based on Viracor Eurofins' interpretation of the American Medical Association's Current Procedural Terminology (CPT) codes and are provided for general informational purposes only. CPT coding is the sole responsibility of the billing party. Questions regarding coding should be addressed to your local Medicare carrier. Viracor Eurofins assumes no responsibility for billing errors due to reliance on the CPT codes illustrated in this material.


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