During a linearity check of a flow sensor in a plethysmograph with a 3-liter calibration syringe, a pulmonary function technologist observes the following:

Which of the following should the technologist do?

While performing a quality control test on an open circuit nitrogen system, the volume of a 3-liter syringe is measured as 3.9 L. Which of the following is the most probable explanation?

After finishing the exercise portion of a test for exercise-induced bronchospasm, a patient
complains of difficulty "catching her breath." A pulmonary function technologist should

Results of two blood gas samples drawn from the same patient, 30 minutes apart, are shown below:

Which of the following is the most likely explanation for these differences?

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.