SpO₂/FiO₂ Ratio (S/F Ratio)
S/F ≈ SpO₂ (%) ÷ FiO₂ (fraction). Educational approximation when ABG is unavailable.
Calculator
How it works
SpO₂/FiO₂ ratio for educational ARDS oxygenation screening.
Interpretation
Use PaO₂/FiO₂ from ABG for definitive Berlin ARDS classification.
Educational tool only—not for diagnosis or treatment decisions.