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C1 Esterase Inhibitor, Functional Assay, Serum

Important Note

Submit a plain red top tube, SST tube will be rejected.

Additional Codes

Primary ID

Epic Code

Mayo Test ID

C1EIN

LAB769 FC1EQ

 

Reporting Name

C1 Esterase Inhib, Functional

Useful For

Diagnosing hereditary angioedema and for monitoring response to therapy

Method Name

Enzyme Immunoassay (EIA)

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Serum Red


Specimen Required


Patient Preparation: Patient should be fasting.

Collection Container/Tube: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions:

1. Immediately after specimen collection, place the tube on wet ice.

2. Centrifuge at 4° C and separate serum from clot.

3. Freeze specimen within 30 minutes.


Specimen Minimum Volume

0.1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Red Frozen 28 days

Reject Due To

Gross hemolysis OK
Gross lipemia OK
Gross icterus Reject
Other Heat-inactivated samples

Reference Values

>67% normal (normal)

41-67% normal (equivocal)

<41% normal (abnormal)

Day(s) and Time(s) Performed

Varies

CPT Code Information

83520

LOINC Code Information

Test ID Test Order Name Order LOINC Value
FC1EQ C1 Esterase Inhib, Functional 48494-9

 

Result ID Test Result Name Result LOINC Value
81493 C1 Esterase Inhib, Functional, QN 48494-9

Test Classification

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

Analytic Time

1 day

Specimen Retention Time

14 days

NY State Approved

Yes