During the calibration and set-up of the metabolic stress testing system for a patient breathing supplemental oxygen, which of the following gas concentrations will ensure accurate calibration of the system?

When using a variable pressure plethysmograph, a leak in the door seal that develops subsequent to calibration will cause underestimation of

A treadmill belt stops for a fraction of a second each time the patient takes a step. A pulmonary function technologist should

A body plethysmograph box pressure transducer fails the electronic calibration check after multiple attempts.
Which of the following should a pulmonary function technologist do?
1. Perform a biologic control test
2. Inspect the door seal.
3. Re-zero the box pressure transducer.
4. Perform a physical pressure calibration.

When performing quality control in a body plethysmograph using a 5-L isothermal bottle, theVTGat shutter closure are as follows:

A pulmonary function technologist should