CRE Pulmonary Function Testing & Interpretation 2

Question 1

On a flow-volume loop, a concave (scooped-out) appearance of the expiratory limb is characteristic of which condition?

Accepted Answer

Obstructive lung disease

Answer

Obstructive lung disease produces a concave expiratory limb on the flow-volume loop because airflow becomes progressively reduced as lung volumes decrease.

Question 2

A methacholine challenge (bronchoprovocation) test is primarily used to evaluate for which condition?

Accepted Answer

Bronchial hyperresponsiveness consistent with asthma

Answer

Methacholine challenge testing measures bronchial hyperresponsiveness; a positive test (PC20 ≤8 mg/mL) supports a diagnosis of asthma.

Question 3

Maximum Voluntary Ventilation (MVV) measures which respiratory parameter?

Accepted Answer

The maximum volume breathed in and out over 12-15 seconds extrapolated to one minute

Answer

MVV is measured by having the patient breathe as rapidly and deeply as possible for 12-15 seconds; the result is extrapolated to L/min and reflects respiratory muscle endurance and airway function.

Question 4

Peak expiratory flow (PEF) monitoring is most commonly used to assess which chronic respiratory condition?

Accepted Answer

Asthma

Answer

PEF monitoring is integral to asthma action plans, allowing patients to detect airflow changes and adjust therapy based on their personal best values.

Question 5

Body plethysmography is required to accurately measure which lung volume that cannot be measured by spirometry alone?

Accepted Answer

Functional Residual Capacity (FRC)

Answer

Body plethysmography uses Boyle's Law to measure FRC (the volume of gas remaining in the lungs at the end of a normal exhalation), which includes residual volume not accessible to spirometry.

(CRE) Certified Respiratory Educator Practice Test

(CRE) Certified Respiratory Educator Practice Test

CRE Pulmonary Function Testing & Interpretation 2