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Clinical Notice:Calculations must be re-checked and should not be used alone to guide patient care, nor should they substitute for professional clinical judgment. OpiCalc is an auxiliary reference tool for qualified healthcare professionals.

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P/F Ratio (PaO2/FiO2)

Lung Injury Assessment

Arterial Oxygenation

Blood Gas & Ventilator Settings

PaO2 (mmHg)Arterial O2

FiO2 (%)Inspired O2

Room Air = 21%

Enter ABG Data

Provide the PaO2 from an arterial blood gas and the current FiO2 to evaluate oxygenation impairment.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Last Comprehensive Review: 2026

Related Pulmonary Tools

GOLD Spirometric Grading

STOP-BANG Score

mMRC Dyspnea Scale

BODE Index

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