Medical calculators › Critical Care Calculators › Alveolar arterial gradient (a-a gradient)

Alveolar arterial Gradient (A-a gradient)

Atmospheric pressure

mm Hg

PaO₂

mm Hg

FiO₂

PaCO₂

mm Hg

Age (for expected A-a gradient)

years

Result :

Please fill out required field.

Reference

Helmholz HF Jr. The abbreviated alveolar air equation. Chest. 1979 Jun;75(6):748

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