Which of the following are necessary to ensure a valid single-breath diffusing capacity of the lungs (DLCO) test result?
1) Two or more acceptable tests should be averaged.
2) Breath-hold time should be between 3 and 5 sec.
3) Corrections for hemoglobin (Hb) and COHb should be included.
4) The maneuvers should be reproducible to within 10%.
A)1, 2, and 3 only
B)2 and 4 only
C)1, 3, and 4 only
D)1, 2, 3, and 4

Question

Quizplus · Accepted Answer

All of the options except for option B are necessary to ensure a valid single-breath diffusing capacity of the lungs (DLCO) test. Two or more acceptable tests should be averaged to increase the accuracy of the results. Breath-hold time should be between 3 and 5 sec to ensure that the gas equilibrium has been achieved. Corrections for hemoglobin (Hb) and COHb should be included because they affect the ability of the blood to carry and release oxygen. The maneuvers should be reproducible to within 10% to ensure the reliability of results. Therefore, the correct choice is C (1, 3, and 4 only).

Which of the Following Are Necessary to Ensure a Valid