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Labcorp Oklahoma, Inc.
Test Directory


Index:

Complement C3, Serum

Order Name C3
Test Number: 5000300
Revision Date 02/26/2018
Test Name Methodology LOINC Code
Complement C3, Serum
Turbidometric 4485-9 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1.5 mL (1 mL) Serum Clot Activator SST Refrigerated or Frozen
Alternate 1 1.5 mL (1 mL) Serum Clot Activator (Red Top, No-Gel) Refrigerated or Frozen
Instructions Separate serum from cells within one hour of collection.
Stability: Room Temperature N/A, Refrigerated 7 days, Frozen 8 days.
If ordering C3 with CH50, Please Collect a Red No-Gel Clot tube, freeze two separate individual aliquots for C3 and CH50. (avoid repeated freeze/thaw cycles).
GENERAL INFORMATION
Testing Schedule Mon - Sat 
Expected TAT 3 Days  
Clinical Use Low levels may occur during infections, exacerbation of SLE and glomerulonephritis. Undetectable level suggests C3 deficiency. 
CPT Code(s) 86160
Lab Section Immunology - Serology