CRE Pulmonary Function Testing & Interpretation 3

Question 1

FEF25-75% (forced expiratory flow between 25% and 75% of FVC) primarily reflects the function of which airways?

Accepted Answer

Small peripheral airways

Answer

Large central airways (trachea and mainstem bronchi)

Answer

Upper airway structures

Answer

Alveolar ducts and sacs

Question 2

Inspiratory Capacity (IC) is calculated using which formula?

Accepted Answer

IC = TLC − FRC

Answer

IC = FRC − RV

Answer

IC = TLC − RV

Answer

IC = ERV + RV

Question 3

A fixed upper airway obstruction, such as tracheal stenosis, produces which characteristic pattern on the flow-volume loop?

Accepted Answer

Flattening of both inspiratory and expiratory limbs

Answer

Flattening of the expiratory limb only

Answer

Flattening of the inspiratory limb only

Answer

Concave scooping of the expiratory limb

Question 4

According to ATS/ERS spirometry quality criteria, what is the minimum number of acceptable maneuvers required to obtain reproducible results?

Accepted Answer

3

Answer

1

Answer

2

Answer

5

Question 5

ATS/ERS reproducibility criteria require that the two largest FVC values from acceptable maneuvers differ by no more than how much?

Accepted Answer

150 mL

Answer

100 mL

Answer

200 mL

Answer

250 mL

Question 6

According to GOLD 2023 guidelines, which spirometric grade indicates mild COPD based on FEV1 percent predicted (post-bronchodilator)?

Accepted Answer

FEV1 ≥80% predicted (GOLD 1)

Answer

FEV1 50–79% predicted (GOLD 2)

Answer

FEV1 30–49% predicted (GOLD 3)

Answer

FEV1 <30% predicted (GOLD 4)

Question 7

Which finding on the volume-time curve of a spirometry maneuver indicates premature termination of effort?

Accepted Answer

No volume plateau and forced expiratory time less than 6 seconds

Answer

Back-extrapolated volume of 80 mL

Answer

Two FVC values within 100 mL of each other

Answer

Peak flow achieved within the first 250 ms