An isothermal lung analog has the following specifications:
5-L glass bottle
2000 g of steel wool
Density of steel wool 5 g/cm3
Volume of connectors and bulb 100 mi-Repeated FRC measurements in the plethysmograph result in a volume of 5.5 L.
Which of the following should a pulmonary function technologist do?

Which of the following thresholds for a clinically significant change in lung function from the beginning to the end of a methacholine challenge test is significant?

A 54-year-old male who smokes presents to the pulmonary laboratory for chronic cough and dyspnea on exertion. PFT and blood gas results show the following:

Which of the following should the pulmonary function technologist recommend?

The following data were obtained from a bronchial challenge test:

APC20 of 2 mg/mL was obtained the next day in another laboratory. Which of the following is the most likely explanation for these data?

During a bronchial provocation study, a patient has the following spirometric values after a
0.25 mg/mL dose of methacholine:

Based on these results, a pulmonary function technologist should