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Test Code C4 C4 Complement, LAB151

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements

Container/Tube:

Preferred: Gold-top serum gel tube or plain, red top tube

Specimen Volume:  0.5 mL of serum

Stability:  Samples may be stored at 2-8°C for up to 3 days, but for prolonged storage they

                  should be kept frozen at -20°C or below for up to 3 months.  Do not freeze and 

                  thaw serum more than once.

Collection Instructions: Specimen should be allowed to completely clot before centrifugation.

Reference Values

13 - 39 mg/dL

Useful For

C4 is a component of the complement system, and has a fundamental role in the inflammatory response and immune system functionality.

Day(s) Test Set Up

Monday & Thursday

Methodology

Turbidimetry

Test Classification and CPT Coding

86160