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CO2 combining power, CO2, Tco2.
To assess the effect of total carbon dioxide levels on respiratory and metabolic acid-base balance.
Serum collected in a gold-, red-, or red/gray-top tube, plasma collected in a green-top (lithium or sodium heparin) tube; or whole blood collected in a green-top (lithium or sodium heparin) tube or heparinized syringe.
(Method: Colorimetry, enzyme assay, or Pco2 electrode)
|Carbon Dioxide||Conventional & SI Units|
|Plasma or serum (venous)|
|Infant–2 yr||13–29 mEq/L or mmol/L|
|2 yr–older adult||23–29 mEq/L or mmol/L|
|Whole blood (venous)|
|Infant–2 yr||18–28 mEq/L or mmol/L|
|2 yr–older adult||22–26 mEq/L or mmol/L|