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Test ID BLOD0300 C1 Esterase Inhibitor Antigen, Serum

Useful For

Diagnosis of hereditary angioedema


Monitoring levels of C1 esterase inhibitor in response to therapy

Specimen Type


Specimen Required

Patient Preparations: Fasting preferred but not required.

Collection Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions:

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

2. Centrifuge and aliquot serum into plastic vial.

3. Freeze specimen within 30 minutes.

Specimen Minimum Volume

0.5 mL

Reject Due To

Gross hemolysis OK
Gross lipemia Reject
Gross icterus OK

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Frozen (preferred) 28 days
  Refrigerated  28 days
  Ambient  72 hours

Day(s) Performed

Monday through Friday

Report Available

2 to 5 days

Method Name


Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information


Reporting Name

C1 Esterase Inhibitor Antigen, S

Reference Values

19-37 mg/dL

Test Classification

This test has been cleared, approved, or is exempt by the US 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.

Secondary ID

Sanford Laboratories - Fargo Additional Information:


Result Code Result Code Description
17808 C1 Esterase Inhibitor Antigen