# Aa Gradient Calculator

The alveolar-arterial gradient is a measure of the difference between the alveolar concentration (A) and the arterial (a) concentration of oxygen. In below Aa gradient calculator, enter the values for patients age, fraction of inspired oxygen, atmospheric pressure, water vapor pressure, partial pressure of arterial, respiratory quotient and partial pressure of arterial to calculate A-a gradient and estimated normal gradient. Alveolar arterial gradient calculator gives the result in mmHg units.

## Alveolar Arterial Gradient Calculator

The alveolar-arterial gradient is a measure of the difference between the alveolar concentration (A) and the arterial (a) concentration of oxygen. In below Aa gradient calculator, enter the values for patients age, fraction of inspired oxygen, atmospheric pressure, water vapor pressure, partial pressure of arterial, respiratory quotient and partial pressure of arterial to calculate A-a gradient and estimated normal gradient. Alveolar arterial gradient calculator gives the result in mmHg units.

Code to add this calci to your website

#### Formula:

a = (FiO_{2} / 100) × (P_{atm} - PH_{2}O) - PaCO_{2} / r - PaO_{2}
e = (g / 4) + 4
**Where,**
a = A-a Gradient
FiO_{2} = Fraction of Inspired Oxygen
P_{atm} = Atmospheric Pressure
PH_{2}O = Water Vapor Pressure
PaCO_{2} = Partial Pressure of Arterial CO_{2}
r = Respiratory Quotient (RQ)
PaO_{2} = Partial Pressure of Arterial O_{2}
e = Estimated Normal Gradient
g = Patients Age
The above Aa Gradient Calculator will be a useful one for the medical practitioners to estimate the Aa gradient. The Alveolar arterial gradient calculator is capable of giving you the reliable results consistently.

**Note :**This statistics calculator is presented for your own personal use and is to be used as a guide only. Medical and other decisions should NOT be based on the results of this calculator. Although this calculator has been tested, we cannot guarantee the accuracy of its calculations or results.