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SurgCritCareClinical Handbook

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Highland Trauma Guide

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PaO2/FiO2 Ratio (P/F Ratio)

Assess oxygenation severity and classify ARDS.

PaO2 mmHgFiO2 decimal

Formula: P/F Ratio = PaO2 / FiO2
Clinical context: Used to classify ARDS severity. Requires ABG and clinical context.
Limitations: P/F ratio is affected by PEEP and FiO2. Berlin criteria require PEEP >= 5 cm H2O.
Source note: ARDS Definition Task Force. JAMA 2012. Berlin Definition of ARDS.

Educational calculation support only. Do not enter patient identifiers. Confirm assumptions and clinical decisions with current local policy.