Typically, ETCO2 is approximately:
A) 2 to 5 mm Hg higher than the arterial PaCO2.
B) 2 to 5 mm Hg lower than the arterial PaCO2.
C) 5 to 10 mm Hg higher than the arterial PaCO2.
D) 5 to 10 mm Hg lower than the arterial PaCO2.
Answer: B) 2 to 5 mm Hg lower than the arterial PaCO2.
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