CORRECT TEXT
A pulmonary function technologist is asked to select gas concentrations to simulate pediatric patients' exhaled concentrations during a DLcosimulation. Which of the following FECO concentrations should the technologist select?

During a cardiopulmonary stress test using breath-by-breath gas analysis, a pulmonary function technologist notices that the VO2suddenly decreases. Which of the following may explain this change?
1.The patient has achieved anaerobic threshold.
2.The measurement of the expired gas volumes is inaccurate.
3.O2analyzer "phase delay" has increased.
4. There is a leak in the tubing or mouthpiece.

A patient with severe airflow limitation pants too rapidly (> 3 breaths/second) against a closed shutter in a body plethysmograph. Which of the following will occur?

A pulmonary function technologist is performing an exercise (stress) test on a patient with severe COPD. As the test progresses, the patient shows signs of increasing dyspnea. Measurements of inspiratory capacity decreased from 2.0 L to 1.5 L.
Which of the following most likely occurred?

A comparison of two techniques for measuring Rawis shown below:

Which of the following should a pulmonary function technologist conclude?