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HelpTest Code LAB151 C4, Complement, Serum/Plasma
Reporting Title
C4
Methodology
Immunoturbidimetric Assay
Note: This is not the same as CD4.
Used for assessing disease activity in autoimmune hemolytic anemia, proliferative glomerulonephritis, rheumatoid arthritis, and systemic lupus erythematosus.
Performing Laboratory
OhioHealth Laboratory Services-RMH Special Testing
Specimen Requirements
Draw blood in a gold-top serum gel tube(s). Spin down and send 0.5 mL of serum refrigerated.
Note:
1. A speckled-top serum gel tube (s) or a plain, red-top tube(s) is also acceptable.
2. Lithium Heparin Green Tube and EDTA plasma are also acceptable.
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum or plasma | Refrigerated | 8 days |
| Ambient | 2 days | |
| Frozen | 3 months |
Specimen Transport Temperature
Refrigerate/Ambient OK/Frozen OK
Reference Values
16-47 mg/dL
Day(s) Test Set Up
Monday through Friday Continuous
Saturday and Sunday Day shift only
Test Classification and CPT Coding
86160