In Which of the Following Situations Would the DLCO Be

Question

In which of the following situations would the DLCO be artificially increased?
A) The measurement is performed at 1500 m above sea level.
B) The subject smoked 1 hour before the test.
C) The measurement is made with the subject in the standing position.
D) The subject has had his or her right lung removed.

Accepted Answer

At higher altitudes, the atmospheric pressure decreases and the concentration of carbon monoxide in the inspired air decreases as well. This can lead to an artificially increased DLCO reading.