Alveolar-arterial Oxygen Difference Calculator

FiO2:  
pCO2:  mmHg
paO2:  mmHg
AaDO2:  

Use this calculator to determine the A-a gradient.

Input the current FiO2 (0.21 1.0) and the measured pCO2 and paO2

Calculator Algorithm:

AaDO2 = (713 x FiO2) (pCO2 / 0.8) (paO2).


Contact this calculator's developers Last Modified 17 July 2012