Oxygenation Index

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Oxygenation Index provides a ratio between the level of oxygen being delivered to the lungs and the amount diffusing into the blood. As such, it represents the ability of the lungs to diffuse oxygen across the alveolar membranes and may be useful in conditions affecting pulmonary function.

  • If you use kilo-Pascals (kPa) rather than Torr as your unit of PaO2 measurement, divide the final result by 7.5 to convert the answer (1kPa = 7.5 Torr).


  • FiO2 = flow of inhaled oxygen (%)
  • MAP = Mean airway pressure (cm.H20)
  • PaO2 = arterial partial pressure of oxygen (Torr)

  • DISCLAIMER: All calculations must be confirmed before use. The authors make no claims of the accuracy of the information contained herein; and these suggested values are not a substitute for clinical judgement. Neither Paeds.co.uk nor any other party involved in the preparation or publication of this site shall be liable for any special, consequential, or exemplary damages resulting in whole or part from any user's use of or reliance upon this material.
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