Guideline decision tool · Respiratory
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P/F Ratio (PaO₂/FiO₂, Berlin ARDS) — free guideline decision tool
Calculate the PaO₂/FiO₂ (P/F) ratio for ARDS severity under the Berlin definition.
Open guideline tool →Computed locally — no data uploaded. For licensed clinicians.
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Guideline-based
Implements the decision logic from published clinical guidelines.
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Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
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Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Common questions
What does P/F Ratio (PaO₂/FiO₂, Berlin ARDS) do?
Grade hypoxaemia and classify ARDS severity.
How is the result calculated?
P/F = PaO₂ ÷ FiO₂ (fraction). ≤ 300 mild, ≤ 200 moderate, ≤ 100 severe ARDS, measured on PEEP ≥ 5 cmH₂O.
Is this a substitute for clinical judgement?
No. All results are decision-support only, for licensed clinicians. They must be individualized to the whole patient and the latest guideline version.
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Run P/F Ratio (PaO₂/FiO₂, Berlin ARDS) now
Calculate the PaO₂/FiO₂ (P/F) ratio for ARDS severity under the Berlin definition.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
Related guideline tools
For use by licensed clinicians and clinical researchers. Computed locally in your browser — no data is uploaded. Not a substitute for clinical judgement.