The formula to calculate the Fio2/Pao2 ratio (R) is:
\[
R = \frac{P}{F}
\]
Where:
\( R \) is the Fio2/Pao2 ratio
\( P \) is the partial pressure of oxygen in arterial blood (Pao2)
\( F \) is the fraction of inspired oxygen (Fio2)
Definitions
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.
Example
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.
Extended information about "Fio2-Pao2-Ratio-Calculator"
PaO2/FiO2 Ratio
Definition: The PaO2/FiO2 ratio is a measure of the efficiency of oxygen transfer in the lungs.
Formula: \( \frac{PaO2}{FiO2} \)
\( PaO2 \): Partial pressure of oxygen in arterial blood (mmHg)
\( FiO2 \): Fraction of inspired oxygen (decimal form)
Example: \( \frac{80}{0.21} \)
\( PaO2 \): 80 mmHg
\( FiO2 \): 0.21
PaO2/FiO2 Ratio in kPa
Definition: The PaO2/FiO2 ratio in kPa is used to assess the oxygenation status in patients using the metric system.
Formula: \( \frac{PaO2}{FiO2} \)
\( PaO2 \): Partial pressure of oxygen in arterial blood (kPa)
\( FiO2 \): Fraction of inspired oxygen (decimal form)
Example: \( \frac{10.6}{0.21} \)
\( PaO2 \): 10.6 kPa
\( FiO2 \): 0.21
SpO2/FiO2 Ratio
Definition: The SpO2/FiO2 ratio is an alternative to the PaO2/FiO2 ratio, using oxygen saturation instead of partial pressure.
Formula: \( \frac{SpO2}{FiO2} \)
\( SpO2 \): Oxygen saturation (percentage)
\( FiO2 \): Fraction of inspired oxygen (decimal form)
