Which gas normally used to measure the diffusing capacity of the lung?
a. O2
b. CO
c. CO2
d. He
ANS: B
Carbon monoxide (CO) is the gas normally used to measure the diffusion capacity (DL) of the lung. The diffusing capacity of the lung for carbon monoxide (DLCO) is expressed in ml/min/mm Hg under standard temperature and pressure and dry conditions.
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