Oxygenation index (OI)

OI = Mean airway pressure (cmH20) * Inspired O2 / Post- ductal PO2 (mmHg). In the following calculation, post-ductal PO2 in mmHg has been converted to KPa.

Mean airway pressure (cmH20)
Inspired O2 (%)
Post-ductal PO2 (KPa)

Oxygenation Index