PaO₂/FiO₂ Ratio (P/F Ratio)

Quantifies the severity of hypoxemia and, per the Berlin Definition, classifies ARDS severity.

For healthcare professionals.These calculate a score or a measurement from values you enter. They do not diagnose, and they are no substitute for clinical judgement. If you are a patient, discuss any result with your own doctor rather than acting on it.

PaO₂mmHg

FiO₂21% = room air.%

Enter the values above to see the result.

Source

ARDS Definition Task Force. Acute respiratory distress syndrome: the Berlin Definition. JAMA. 2012;307(23):2526-2533.

Shown for reference and checked against the source above. Confirm against current guidance before acting on it, and use your own clinical judgement.

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