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what is the normal value for PaO2 in an adult patient: a)

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what is the normal value for PaO2 in an adult patient:

a) 50-60
b) 60-70
c) 70-80
d) 80-100
** I think it is "D" but the book just states this is the normal value, doesn't say for what age group?
Yes, the correct answer is D. A PaO2 that is slightly low, in the 60s and 70s, is tolerable, so usually does not need oxygen supplementation until the PaO2 is <60. But the normal PaO2 is 80-100.

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