How do you measure residual volume since it's the air that

Last updated: 8/8/2022

How do you measure residual volume since it's the air that does not leave the lungs? Select one or more: a. Body plethysmography: A person sits inside an airtight booth (plethysmograph) and breathes through a mouthpiece while pressure and air flow measurements are collected. b. This is not measure but calculated. c. None of the above d. A gas dilution test: this is where a person breathes from a container containing known amount of a gas (oxygen or helium). Then measure the change of gas in the container.