Respiratory Indices Calculator

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Oxygenation Index (OI)
Ventilation Index (VI)
Arterial Alveolar Ratio (aA Ratio)
Alveolar Arterial Oxygen Difference (AaDO2)

Respiratory indices have two main uses:

  • Eligibility for determining a eligibility for a treatment (for example, OI for ECMO) or research intervention (for example, AaDO2 for the LessMAS trial)

  • Research or audit purposes when evaluating the amount of respiratory support required for individual babies, particularly when making comparisons between differing levels of support that an infant may require.

 

%
FiO2
cm H2O
cm H2O
cm H2O
breaths/min

Oxygenation Index (OI)
Ventilation Index (VI)
a/A Ratio %
A-a Difference (Aa DO2)