In healthy adults at rest on FIO₂ 0.21,what does the mean alveolar-arterial oxygen tension difference equal?
A) 10 mm Hg
B) 20 mm Hg
C) 30 mm Hg
D) 40 mm Hg

Question

Quizplus · Accepted Answer

The mean alveolar-arterial oxygen tension difference (A-a gradient) in healthy adults at rest on room air (FIO₂ 0.21) is approximately 10 mm Hg. This gradient represents the difference between the oxygen concentration in the alveoli and the arterial system, and it increases with age.

In Healthy Adults at Rest on FIO₂ 0