Theoxygenation index is a calculation used in intensive care medicine to measure thefraction of inspired oxygen (FiO2) and its usage within the body.

A lower oxygenation index is better - this can be inferred by the equation itself. As the oxygenation of a person improves, they will be able to achieve a higher PaO2 at a lower FiO2. This would be reflected on the formula as a decrease in the numerator or an increase in the denominator - thus lowering the OI. Typically an OI threshold is set for when a neonate should be placed on ECMO, for example >40.

${\displaystyle OI=\frac{Fi{\text{O}}_2^{}\times M_{\text{PAW}}}{Pa{\text{O}}_2^{}}}$^[1]

• ${\displaystyle Fi{\text{O}}_2^{}}$:Fraction of inspired oxygen, in percent;
• ${\displaystyle M_{\text{PAW}}}$:Mean airway pressure, in mmHg;
• ${\displaystyle Pa{\text{O}}_2^{}}$:Partial pressure of oxygen in arterial blood, in mmHg.

• Respiration

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