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Carbon Dioxide Content - Blood

Source Blood
Mnemonic CO2
Specimen Requirements 1 x 3 mL or 4.5 mL light green (mint) top PST tube.  Gold top SST tube also acceptable.

0.2 mL plasma or serum

Minimum Whole Blood Volumes for Microcollections
Specimen Handling
Additional Information

COadd-on requests are not processed on microcollection samples or on community patients due to instability.

Testing Location Chemistry-All Sites
Rural: CRL
Testing Frequency Daily
Alternate Name(s) Bicarbonate, Bicarbonate Content, CO2
Reference Interval

0-5 years

18-27 mmol/L

6-150 years

21-31 mmol/L