In the Open Circuit Washout Method, What Gas Mixture Does

Question

In the open circuit washout method, what gas mixture does the patient breathe for the test?
A) 100%N2
B) room air
C) 100% O2
D) He-O2mixture

Accepted Answer

The patient breathes 100% O₂ in the open circuit washout method to wash out nitrogen from the lungs, allowing for the measurement of lung volumes and nitrogen washout curves.