Which of the following problems may be identified by using an isothermal lung analog to perform quality control on a body plethysmograph?
1. Improperly calibrated mouth pressure transducer
2. Obstructed or perforated pneumotachometer
3. Increase in mechanical resistance
4. Malfunctioning box pressure transducer

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?

Which of the following tracings represents an airways resistance maneuver performed with a slow breathing frequency?

The following values are obtained using a 3-liter calibration syringe during volume calibration of a dry-rolling spirometer:
2.80 L
2.79 L
2.82 L
The performance of this spirometer is best described as

A pulmonary function technologist is performing an exercise study on a patient with sarcoidosis. Which of the following end-tidalCO2values should the technologist expect at rest, if the test is performed appropriately?