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A-a O2 Gradient Calculator

Alveolar-arterial oxygen gradient

The alveolar-arterial oxygen tension difference (“A-a gradient”) is used in evaluating the causes of hypoxemia.

Enter Your Details
PaO2(partial pressure of arterial O2): mmHg
PaCO2 (partial pressure of arterial CO2): mmHg
Atmospheric Pressure:
Inspired Oxygen Concentration (FiO2): Room Air (21percent)
Your Results
A-a Gradient mmHg

A-a (O2) = (FiO2%/100) * (Patm – 47 mmHg) – (PaCO2/0.8) – PaO2
(units in mmHg)

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