The end point of a helium dilution test occurs when:
a. nitrogen is washed out.
b. there is no more helium.
c. the change in pressure remains steady.
d. the helium percentage remains steady for 2 minutes.
ANS: D
The end point of the helium dilution test is reached when the helium percentage remains steady for 2 minutes, indicating that the helium is equilibrated between the spirometer and the patient's lungs.
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