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?

A biologic control subject has a FRCplethof 4.0 +-0.3 L at panting frequencies between 60 and 70/min. During a QC run, the subject pants at55/min and a FRCplethof 3.90 L is recorded.
Which of the following is the most appropriate action to take?

A comparison of two techniques for measuring Rawis shown below:

Which of the following should a pulmonary function technologist conclude?

When selecting gas tanks for a DLcosimulator, which of the following expired CO gas concentrations will produce the highest simulated DLco?

Pulmonary function tests performed on a patient with tracheal stenosis may demonstrate increased