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NBRC Registry Examination for Advanced Pulmonary Function Technologists Sample Questions:

1. A patient's bronchial provocation test was interpreted as positive for hyperreactive airways. Considering changes from a pre-challenge baseline, all of the following are consistent with this interpretation EXCEPT a

A) 25% increase in FRC.
B) 25% decrease in FEFmax.
C) 25% decrease in FEF25-75%.
D) 25% decrease in Raw.

2. 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) 2, 3, and 4 only
B) 1, 2, and 4 only
C) 1, 2, and 3 only
D) 1, 3, and 4 only

3. While performing a plethysmographic lung volume test, a technologist observes that the patient's breathing efforts do not produce consistent pressure fluctuations in the box. Which of the following is the most likely reason for this issue?

A) Hyperventilation during the test
B) Airway obstruction preventing pressure transmission
C) Incorrect gas mixture in the box
D) Leaks in the mouthpiece or tubing

4. During a forced vital capacity (FVC) maneuver, a patient produces an exhalation with a slow start and delayed peak expiratory flow. Which of the following is the most probable cause of this pattern?

A) Incorrect nose clip placement
B) Submaximal effort by the patient
C) Glottic closure at the start of exhalation
D) Leak in the mouthpiece

5. Results of two blood gas samples drawn from the same patient, 30 minutes apart, are shown below:
Which of the following is the most likely explanation for these differences?

A) The 10:30 blood sample has been contaminated with air.
B) The patient has developed a pneumothorax.
C) The 10:30 blood sample contains an excess of heparin solution.
D) The patient's minute ventilation has increased.

Solutions: