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Test Mnemonic C2 C2 Complement, Antigen, Serum

Additional Codes

Mayo Test ID
C2AG

Reporting Name

C2 Complement, Antigen, S

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type

Serum Red


Advisory Information


The total complement assay (COM / Complement, Total, Serum) should be used as a screen for suspected complement deficiencies before ordering individual complement component assays. A deficiency of an individual component of the complement cascade will result in an undetectable total complement level.



Specimen Required


Only orderable as a reflex. For more information see C2 / C2 Complement, Functional, with Reflex, Serum.

 

Patient Preparation: Fasting preferred but not required

Supplies: Aliquot Tube, 5 mL (T465)

Collection Container/Tube: Red top

Submission Container/Tube: Plastic, 5-mL tube (T465)

Specimen Volume: 1 mL

Collection Instructions:

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

2. Spin down and separate serum from clot.

3. Immediately freeze specimen.


Specimen Minimum Volume

0.5 mL

Specimen Stability Information

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

Reference Values

Only orderable as a reflex. For more information see C2 / C2 Complement, Functional, with Reflex, Serum.

 

1.1-3.0 mg/dL

Day(s) and Time(s) Performed

Friday; 1 p.m.

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.

CPT Code Information

86160

LOINC Code Information

Test ID Test Order Name Order LOINC Value
C2AG C2 Complement, Antigen, S 4484-2

 

Result ID Test Result Name Result LOINC Value
84141 C2 Complement, Antigen, S 4484-2

Method Name

Only orderable as a reflex. For more information see C2 / C2 Complement, Functional, with Reflex, Serum.

 

Radial Immunodiffusion

Useful For

Diagnosis of C2 deficiency

 

Investigation of a patient with a low (absent) hemolytic complement (CH50)