Enter the PAO2 and the PaO2 into the Calculator. The calculator will evaluate the A/A Ratio.

## A/A Ratio Formula

A/A = PAO2 / PaO2

Variables:

- A/A is the A/A Ratio ()
- PAO2 is the PAO2
- PaO2 is the PaO2

To calculate A/A Ratio, divide the PAO2 by the PAO2.

## How to Calculate A/A Ratio?

The following steps outline how to calculate the A/A Ratio.

- First, determine the PAO2.
- Next, determine the PaO2.
- Next, gather the formula from above = A/A = PAO2 – PaO2.
- Finally, calculate the A/A Ratio.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

PAO2 = 15

PaO2 = 19