PaO₂/FiO₂ Ratio Calculator
Calculate the PaO₂/FiO₂ (P/F) ratio to assess oxygenation and classify ARDS severity.
How to Use
- Enter the arterial oxygen partial pressure (PaO₂) in mmHg.
- Enter the fraction of inspired oxygen (FiO₂) as a decimal.
- Click Calculate to see the P/F ratio and ARDS classification.
Casi d'Uso
- •ICU oxygenation monitoring.
- •ARDS diagnosis and severity grading.
- •Ventilator management guidance.
Formula
P/F Ratio = PaO₂ (mmHg) / FiO₂. Normal >400; Mild ARDS 200–300; Moderate ARDS 100–200; Severe ARDS <100.
Domande Frequenti
What is a normal P/F ratio?
A normal P/F ratio is greater than 400 mmHg. Values below 300 suggest impaired oxygenation; below 200 indicates moderate ARDS.
How is FiO₂ expressed?
FiO₂ is expressed as a decimal fraction from 0.21 (room air) to 1.0 (100% oxygen).
Disclaimer
For educational purposes only. Does not replace professional medical evaluation.