Which of the following can alter the calibration of a spirometer that uses a pressure-differential pneumotachometer?
A) Development of laminar flow in the pneumotachometer
B) Allowing a healthy adult subject to exhale maximally through it
C) Exhaustion of the water absorber (desiccant)
D) Water droplet condensation in the resistive element

Question

Quizplus · Accepted Answer

Water droplet condensation in the resistive element can alter the calibration of a spirometer that uses a pressure-differential pneumotachometer. The droplets can partially block the air flow and increase resistance, leading to inaccurate measurements. The other options listed do not directly impact the calibration of the spirometer.

Which of the Following Can Alter the Calibration of a Spirometer