Is it always necessary to get an arterial blood gas to evaluate oxygenation and ventilation? Many patients in the icu have central lines but no arterial line.
If you draw a vbg and the pH is ok, the pco2 isn't high, and the pulse ox reading is ok, what is the utility of an arterial sample?
If you draw a vbg and the pH is ok, the pco2 isn't high, and the pulse ox reading is ok, what is the utility of an arterial sample?