PFT set questions with complete solutions

When bronchoprovocation testing is used, the FEV1 needs to decrease by what percentage before a diagnosis of hyperactive airways is made? correct answer: 20% What do relative contraindications for lung volume determinations include? 1. Patient with dementia 2. Unstable cardiovascular status 3. Untreated pneumothorax 4. Hemoptysis of unknown origin correct answer: 1234 A patient has a TLC of 6700 mL, an IRV of 2500 mL, and a FRC of 3500 mL. What is the patient's VT correct answer: 0.7 L A patient has a IC of 4000 mL, an RV of 1000 mL, and a FRC of 2500 mL. What is the patient's VC? correct answer: 5500 mL In which of the following conditions is total lung capacity (TLC) always reduced correct answer: Restrictive lung disease The volume of air inhaled and exhaled during quiet breathing is known as the correct answer: tidal volume In both the helium dilution test and nitrogen washout functional residual capacity (FRC) determinations, at what point should the patient normally be connected to the system to begin the test? correct answer: Resting expiration Which of the following is not a general purpose of performing pulmonary function tests (PFTs)? correct answer: The specific diagnosis of pulmonary disease What is the maximum amount of gas that can be inhaled and exhaled? correct answer: VC The presence of an FVC that is significantly smaller than the slow vital capacity (SVC) is consistent with correct answer: air trapping You have just given your patient a 0.03 mg/ml dose of methacholine to assess for asthma. The subsequent FEV1 decreases by 22%. What should you do next? correct answer: administer bronchodilator Which of the following pulmonary function devices directly collect and measure gas volumes? 1. Water-sealed spirometer 2. Dry rolling-seal spirometer 3. Peak expiratory flow meter 4. Pneumotachometer correct answer: water seal & dry roll