What is the normal P(A?a)O2 range while breathing room air?
a. 25 to 50 mm Hg
b. 10 to 25 mm Hg
c. Greater than 25 mm Hg
d. Less than 10 mm Hg
ANS: B
The P(A−a)O2 ranges from 10 mm Hg in young patients to approximately 25 mm Hg in the el-derly while breathing room air.
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