The Alveolar Gas calculator computes the partial pressure of oxygen in the pulmonary alveoli based on the fraction of oxygen in the inhaled gas, the atmospheric pressure, the ratio of CO2 to O2 , the saturated vapor pressure, and the partial pressure of the CO2.
INSTRUCTIONS: Choose the preferred units and enter the following:
Alveolar Partial Pressure: The alveolar partial pressure is given in kPa. However, this can be automatically converted to other pressure units via the pull-down menu.
The pulmonary alveolar partial pressure is used to calculate the alveolar-arterial gradient of oxygen and the amount of right-to-left cardiac shunt. The Alveolar Gas Equation is as follows:
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 Alveolar Gas Equation
 Pulmonary alveolus
 Alveolar-arterial gradient
The equation relies on the following assumptions:
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