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