ICU and Critical Care · Pulmonology
Horowitz Index (P/F Ratio) calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
mmHg
Allowed range: 20–600 mmHg
Quick picks
fraction
Allowed range: 0.21–1 fraction
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Result
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Clinical inputs
- horowitz pao2 mmhgAccepted range: 20 to 600
- horowitz fio2 fractionAccepted range: 0.21 to 1
Primary source
ARDS Berlin definition P/F ratio thresholds. DOI: 10.1001/jama.2012.5669. PMID: 22797452. Scope: acute respiratory distress syndrome severity stratification using PaO₂/FiO₂ with appropriate PEEP criteria in clinical practice. (2012)
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