A-a Gradient Calculator

Calculate alveolar-arterial oxygen gradient

Enter the fio2 value for this calculation.
(0-1)
Enter the pao2 value for this calculation.
mmHg
Enter the paco2 value for this calculation.
mmHg
Force per unit area, measured in PSI, Pa, or other units.
mmHg
Age in the specified unit (typically years).
years

Results

Alveolar PAO2:
Calculated alveolar pao2 based on your inputs.
-mmHg
A-a Gradient:
Calculated a-a gradient based on your inputs.
-mmHg
Expected for Age:
Calculated expected for age based on your inputs.
-mmHg
Reference: Industry Standards.