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Test ID C5AG C5 Complement, Antigen, Serum

Useful For

Diagnosis of C5 deficiency


Investigation of a patient with an absent total complement (CH50) level

Method Name


Reporting Name

C5 Complement, Antigen, S

Specimen Type


Specimen Required

Collection Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions:

1. Fasting

2. Spin down and separate serum from clot.

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Frozen (preferred) 60 days
  Ambient  7 days
  Refrigerated  7 days

Reference Values

10.6-26.3 mg/dL

Day(s) and Time(s) Performed

Monday through Saturday; Continuous with a 3 p.m. cutoff

Performing Laboratory

Mayo Medical Laboratories in Rochester

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
C5AG C5 Complement, Antigen, S 4505-4


Result ID Test Result Name Result LOINC Value
C5AG C5 Complement, Antigen, S 4505-4

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.