Pco 2

0.01 sec.

carbon dioxide tension (PCO₂),

the partial pressure of carbon dioxide, a measure of the relative concentration of the gas in air or in a fluid, such as plasma. It is expressed quantitatively in millimeters of mercury (mm Hg). Alveolar PCO₂ directly reflects pulmonary gas exchange in relation to blood flow: alveolar PCO₂ usually decreases as the respiration rate increases. Normal values for arterial and alveolar PCO₂ are between 35 and 45 mm Hg. Higher levels occur in conditions of slow blood flow and respiration. Below-normal values are caused by hyperventilation and lead to respiratory alkalosis. Also called carbon dioxide pressure. See also carbon dioxide, hypercapnia, hyperventilation, hypoventilation.

Pco₂

carbon dioxide partial pressure or tension; also written P_CO_₂, pCO₂, or pCO₂ (see respiration and blood gas analysis).

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