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Test Code C1ES C1 Esterase (C1ES) Inhibitor Antigen, Serum

Important Note

Order synonym C1ES


Use Sunquest code C1ES to order

Reporting Name

C1 Esterase Inhibitor Antigen, S

Useful For

Diagnosis of hereditary angioedema


Monitoring levels of C1 esterase inhibitor in response to therapy

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type


Specimen Required

Collection Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions: Fasting preferred but not required.

UChicago Medicine Medical Laboratories Note:

Offsite collection Instructions:

Fasting specimen

Spin and aliquot serum in Mayo tube

Place in the freezer until courier picks up

Send on dry ice to the Main Lab (Lab Service Center, TW005)

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Frozen (preferred) 14 days
  Ambient  72 hours
  Refrigerated  72 hours

Reference Values

19-37 mg/dL

Day(s) and Time(s) Performed

Monday through Saturday; Continuously until 3 p.m.

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.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
C1ES C1 Esterase Inhibitor Antigen, S 4477-6


Result ID Test Result Name Result LOINC Value
C1ES C1 Esterase Inhibitor Antigen, S 4477-6

Reject Due To


Mild OK; Gross OK


Mild OK; Gross reject


Mild OK; Gross OK



Method Name