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CO2 (Bicarbonate)

Tube Type = Mint Green Plasma Separator Tube

Tube Type

Test ID LAB55
EPIC Order CO2 TOTAL
CPT Code(s) 82374
Group/Individual Test Individual
Laboratory Core Laboratory
Tube Station Routine 30; STAT 888
Specimen Routine: 1 mL blood/green lithium heparin gel tube. Also acceptable gold SST, orange SST, or red plain tube
Micro: 200 µL blood/mint green top bullet/gold top/red top
Stability Unspun: 6 hours
Spun/Separated,
Room Temp:		 8 hours
Spun/Separated,
Refrigerated:		 3 days
Frozen: 60 days
Availability 24 Hours/Day
Turnaround Time STAT 1 hr., Routine 2 hrs.
Reference Range Normal: 20-31 mmol/L
Critical: <12 mmol/L or >40 mmol/L

Reviewed by J. Carr on January 13, 2026

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514