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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Carbon Dioxide

Test Code(s): CO2

CPT Code(s): 82374

Test Description: Included In: Electrolytes Panel, Basic Metabolic Panel, Comprehensive Metabolic Panel

Methodology: Enzymatic or Ion Selective Electrode

Days Performed: Daily, 24 hours.

Turnaround Time: Stat: 1 hour.
Routine: 4 hours.


Specimen Requirements

Specimen: Blood

Collection Instructions: Tube must be at least one quarter full.

Collection Container: Preferred: Green cap with yellow ring (PST)
Also Acceptable: Green top, Red cap with yellow ring (SST), Red top

Collection Volume: Preferred: 1 mL
Pediatrics: 0.5 mL

Sample Analyzed: Plasma or serum

Volume Required: Preferred: 0.5 mL
Pediatrics: 0.2 mL

Specimen Processing: Centrifuge.  If a complete barrier has not formed, transfer cell-free plasma/serum to plastic vial.  Tube or plastic vial must be 25% full and capped.  Refrigerate.

Specimen Transport: Transport specimen to the laboratory. Transport with coolant pack if coming from outreach location.

Stability: Ambient: 8 hours
Refrigerated: 24 hours
Frozen: Not acceptable


Interpretation

Reference Interval:

0 days and up: 22-32 mmol/L

CO2   TCO2  bicarbonate  HCO3

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