You obtain an SpO2 reading of 100% on a patient receiving O2 through a nonrebreathing mask. What range of PaO2 levels is possible in this patient?
a. 60 to 90 mm Hg
b. 90 to 100 mm Hg
c. 100 to 200 mm Hg
d. 100 to 600 mm Hg
ANS: D
At the high end, oximetry data can be even less meaningful. Because of the characteristics of the oxyhemoglobin dissociation curve (see Chapter 11), a patient with an SpO2 reading of 100% could represent a PaO2 level anywhere between 100 and 600 mm Hg.
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