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HelpTest Code C2 C2 Complement, Functional, with Reflex, Serum
Ordering Guidance
This test is for assessment of complement C2 and includes assessment of C3 and C4 as reflex testing. Unless a deficiency has already been identified, initial assessment should begin with the total complement assay (COM / Complement, Total, Serum), which is a screen for suspected complement deficiencies and should be performed 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
Patient Preparation: Fasting preferred but not required
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
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 and aliquot serum into plastic vial.
3. Immediately freeze specimen.
Useful For
Investigation of a patient with a low (absent) hemolytic complement, with reflex testing to C3 and C4, if appropriate
Reflex Tests
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| C4 | Complement C4, S | Yes | No |
| C3 | Complement C3, S | Yes | No |
Testing Algorithm
If the C2 result is less than 15 U/mL, then complement C3 and C4 will be performed at an additional charge.
Method Name
Automated Liposome Lysis Assay
Reporting Name
C2 Complement,Functional,w/Reflex,SSpecimen Type
Serum RedSpecimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum Red | Frozen | 21 days |
Reference Values
25-47 U/mL
Day(s) Performed
Monday through Friday
Report Available
1 to 3 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
86161
86160 x 2 (if appropriate)
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| C2 | C2 Complement,Functional,w/Reflex,S | 93977-7 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| C2FX | C2 Complement,Functional,S | 93977-7 |
| INT53 | Interpretation | 69048-7 |