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Test Code COM4 Complement C4

Performing Laboratory

Hunterdon Medical Center Laboratory

Useful For

  • Investigating an undetectable total complement (CH50)
  • Confirming hereditary angioedema (with low C1 inhibitor)
  • Assessing disease activity in systemic lupus erythematosus, proliferative glomerulonephritis, rheumatoid arthritis, and autoimmune hemolytic anemia

Specimen Requirements

 

Container/Tube  
Acceptable  PST (Li Hep) Gel- Mint Green Top
Acceptable  SST
Specimen Volume  3.0 mL
Minimum Volume  1.0 mL

 

Specimen Type

Plasma/Serum

Specimen Transport Temperature

Ambient

Specimen Stability

 

Specimen Temperature Time Frame
Plasma Refrigerated 2-8°C 7 days
Serum-gel tube Refrigerated 2-8°C 7 days

Updated June 2020 

Day(s) Test Set up

Monday through Sunday

Reference Values

10-40 mg/dL

Methodology

Immunoturbidometric Assay

CPT Code

86160

Loinc Code

4498-2