Synonyms
Complement C4, Fourth Component of Complement
Specimen Type
Plasma or Serum
Performing Lab
RCHSD Chemistry
Epic ID
LAB151
Lab Test Days
As received
Standard TAT
4 Hours
Stat TAT
2 Hours
Collection Information
Specimen Required
0.5-1 mL Blood
Container Type
Light Green (Lithium Heparin PST)
Collection Instructions
Serum collected in a red-top tube or serum separator tube (SST) is also acceptable.
Processing Information - Lab Use Only
Transport Temperature
Room Temp-OK/Refrigerated-OK/Frozen-OK
Specimen Stability
Room Temp: 2 Days; Refrigerated: 2 Days; Frozen: >2 Days
Test Volume Required
0.5 mL Plasma or Serum
Minimum Test Volume
0.25 mL Plasma or Serum
Processing Instructions
Separate plasma or serum and deliver to Chemistry.
CPT Codes
86160
Revised
7/30/26
Initials
SA