Treadmill speed can be verified by

Which of the following may cause a reduction in end-tidal CO2?

To assure linearity of an oxygen analyzer, calibrate with

The following results are obtained from an adult patient:
Which of the following is the best interpretation of these values?

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.