Which parameter is considered to be the most accurate and reliable measure of oxygenation effi-ciency?

a. PaO2/FiO2 ratio
b. P(A–a)O2/PaO2 ratio
c. Qs/Qt
d. PaO2/SaO2 ratio


ANS: C
The most accurate and reliable measure of oxygenation efficiency is direct computation of the physiologic shunt.

Health Professions

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