Work out pao2 fio2 ratio instantly with clear inputs, formula shown and shareable results.
Divides arterial oxygen tension by the inspired oxygen fraction and maps the result onto the Berlin ARDS severity bands.
P/F ratio
P/F = PaO2 (mmHg) / FiO2 (as a fraction). Berlin bands: mild 201-300, moderate 101-200, severe <=100 with PEEP >=5 cmH2O
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
Yes. The Berlin definition requires at least 5 cmH2O of PEEP or CPAP for the bands to apply.
Divide the mmHg ratio by 7.5; a P/F of 300 mmHg is 40 kPa.