ICU and Critical Care · Pulmonology · Emergency Medicine
SpO2/FiO2 Ratio calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
%
Allowed range: 50–100 %
Quick picks
fraction
Allowed range: 0.21–1 fraction
Quick picks
Result
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Clinical inputs
- SpO2 (%)Accepted range: 50 to 100
- FiO2 (fraction)Accepted range: 0.21 to 1
Primary source
Rice TW et al. Comparison of the SpO2/FIO2 ratio and the PaO2/FIO2 ratio in patients with acute lung injury or ARDS. Chest. DOI: 10.1378/chest.07-0617. PMID: 17573487. Scope: S/F = SpO2(%) / FiO2(fraction). (2007)
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