What is the normal gradient between PaCO2 and PETCO2?
a. 3 to 5 mm Hg
b. 5 to 10 mm Hg
c. 10 to 15 mm Hg
d. 15 to 20 mm Hg
ANS: A
In healthy individuals, the PETCO2 averages 3 to 5 mm Hg less than the PaCO2, or between 35 and 43 mm Hg (approximately 5% to 6% CO2).
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