// multi-utility computation suite · offline · instant · precise
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health.alveolar-gas-equation Calculator
Calculates alveolar oxygen tension (PAO₂) from the alveolar gas equation and derives the A-a gradient to assess gas exchange efficiency. A-a gradient above 15 mmHg in a young adult (or >4 + age/4 mmHg) indicates an intrinsic cause of hypoxia rather than hypoventilation.
Inputs
Fio2 Pct
Reference formula or conversion factor shown for context.
Paco2 Mmhg
Reference formula or conversion factor shown for context.
Rq
Reference formula or conversion factor shown for context.
Pb Mmhg
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Results
alveolar PO₂ PAO₂ (mmHg)
Reference formula or conversion factor shown for context.
A-a gradient (estimated, mmHg)
The value at the specified point or condition.
PAO₂ = FiO₂(Pb-47) - PaCO₂/RQ
Reference formula or conversion factor shown for context.