Pulmonology · ICU and Critical Care
Alveolar Gas Equation (PAO2) calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
fraction
Allowed range: 0.21–1 fraction
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mmHg
Allowed range: 400–760 mmHg
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mmHg
Allowed range: 10–100 mmHg
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ratio
Allowed range: 0.7–1 ratio
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Result
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Clinical inputs
- FiO₂ (fraction)Accepted range: 0.21 to 1
- Patm (mmHg)Accepted range: 400 to 760
- PaCO₂ (mmHg)Accepted range: 10 to 100
- RQ (ratio)Accepted range: 0.7 to 1
Primary source
Rossi A et al. Physiology of the alveolar gas equation. Eur Respir J. DOI: 10.1183/13993003.0123-2016. PMID: 27053832. Scope: PAO2 (mmHg) = FiO2 × (Patm − PH2O) − PaCO2/RQ with PH2O = 47 mmHg at body temperature. (2016)
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