A healthy person breathing 100% O2 at sea level would have PAO2 of approximately what level?

a. 149 mm Hg
b. 670 mm Hg
c. 713 mm Hg
d. 760 mm Hg


ANS: B
If the FiO2 is 1.0, the PB is 760 mm Hg, and the PACO2 is 40 mm Hg, the alveolar partial pres-sure of O2 can be estimated as follows:
PAO2 = 1 ? (760 mm Hg – 47) – (40 mm Hg ÷ 0.8) = 663 mm Hg

Health Professions

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