Calculator

Oxygenation index

New

OI = FiO₂(%) × mean airway pressure ÷ PaO₂.

%
cmH₂O
mmHg

Oxygenation index

26.7

Very severe; consider rescue/ECMO referral

Lower severity
Severe
Very severe; consider rescue/ECMO referral

Formula

fio2pct * mpaw / pao2

References

  1. Ortiz RM, Cilley RE, Bartlett RH. Extracorporeal membrane oxygenation in pediatric respiratory failure. Pediatr Clin North Am 1987;34:39-46.

Used in

Defining and diagnosing ARDSVV vs VA ECMO: modes and indicationsECMO referral: who, when and howPaediatric airway: sizes, RSI and first ventilator settings

Calculators support, not replace, clinical judgement. Check inputs and units, and confirm doses with your unit protocol.