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Fio2/Pao2 Ratio Calculator

Formula

The formula to calculate the Fio2/Pao2 ratio (R) is:

$R = \frac{P}{F}$

Where:

Fio2/Pao2 Ratio: A clinical measurement used to assess the efficiency of oxygen transfer in the lungs. It is calculated by dividing the partial pressure of oxygen in arterial blood (Pao2) by the fraction of inspired oxygen (Fio2). This ratio is particularly useful in evaluating patients with respiratory distress or other conditions affecting lung function. A lower ratio indicates poorer oxygenation and may suggest the need for medical intervention.

Let's say the partial pressure of oxygen in arterial blood (Pao2) is 80 mmHg and the fraction of inspired oxygen (Fio2) is 0.21. Using the formula:

$R = \frac{80}{0.21}$

We get:

$R \approx 380.95$

So, the Fio2/Pao2 ratio is approximately 380.95.