Airways resistance and specific conductance tests are requested for a 7-year-old child with asthma.
Which of the following techniques is preferred?

A 6-year-old child has a history of repeated episodes of wheezing and shortness of breath. A pulmonary function technologist has difficulty obtaining repeatable spirometry results. Which of the following tests should be performed next?

A pulmonary function technologist is performing an exercise study on a patient with sarcoidosis. Which of the following end-tidal CO2 values should the technologist expect at rest, if the test is performed appropriately?

A pulmonary function laboratory routinely tests five subjects as biologic controls. Acceptable instrument performance over time is indicated when measurements

The following values are reported at maximum effort for a 50-year-old, 70-kg (154-lb) male with significant coronary artery disease during ergometer stress testing. Which of the following is most likely an error?