Equation
If FIO2 is small then
In which case the equation can be simplified to:
where:
| Quantity | Description | Sample value |
|---|---|---|
| pAO2 | The alveolar partial pressure of oxygen (pO2) | 107 mmHg (14.2 kPa) |
| FIO2 | The fraction of inspired gas that is oxygen (expressed as a decimal). | 0.21 |
| PATM | The prevailing atmospheric pressure | 760 mmHg (101 kPa) |
| pH2O | The saturated vapour pressure of water at body temperature and the prevailing atmospheric pressure | 47 mmHg (6.25 kPa) |
| paCO2 | The arterial partial pressure of carbon dioxide (pCO2) | 36 mmHg (4.79 kPa) |
| RQ (RER) | The respiratory quotient (Respiratory Exchange Ratio) | 0.8 |
Sample Values given for air at sea level at 37°C.
Read more about this topic: Alveolar Gas Equation
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