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Carbon Dioxide
Test CodeCO2
CPT Codes
82374
Preferred Specimen
GREEN Lithium Heparin Plasma
Minimum Volume
0.25 mL
Other Acceptable Specimens
SST Serum Separator, Red No Gel
Instructions
Separate from cells within 4 hours of collection
Transport Container
GREEN Lithium Heparin
Transport Temperature
Room Temperature
Specimen Stability
Room Temp: 24 Hours; Refrigerated: 3 Days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Not separated from cells within 4 hours of collection, gross hemolysis
Methodology
Vitros 7600/3400
Reference Range
22 - 30 mmol/L; Critical : <12 or >45 mmol/L
Clinical Significance
The carbonic acid–bicarbonate buffer system is one of the important buffer systems that maintains the pH of the blood. Total CO2 (i.e., bicarbonate plus dissolved CO2 ) measurements are used together with other clinical and laboratory information (arterial pH and pCO2 ) for the evaluation of acid-base disorders. Total CO2 is generally increased in respiratory acidosis, metabolic alkalosis, and excessive alkali intake. CO2 is decreased in compensated respiratory alkalosis, metabolic acidosis, and in renal disorders where H+ ions cannot be excreted.
Performed By
RFGH Laboratory
Performing Laboratory
RFGH Laboratory
