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Collection Instructions

Unity Point Health - Cedar Rapids

Website:

Mayo Medical Laboratories

Mayo Clinic Laboratories

Test Code C4 C4 Complement, LAB151

Additional Codes

 Test ID
C4

EPIC Test ID
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

Day(s) Test Set Up

Monday & Thursday

Useful For

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

Methodology

Turbidimetry

Test Classification and CPT Coding

86160

Report Available

2 - 4 days