Certified Pulmonary Function Technologist (CPFT) Practice Exam

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If there is a hole or crack in the thermal pneumotach, how will this affect volume readings?

Increased

Decreased

When a thermal pneumotachometer has a hole or crack, it alters the flow of air through the device. The primary function of this instrument is to accurately measure airflow and subsequently calculate volume based on that airflow over time.

In the case of a hole or crack, the air can escape from the intended path of airflow. This leads to a reduction in the actual volume of air being measured, resulting in a lower volume reading. The device effectively registers less flow than what is actually occurring because some of the air bypasses the flow sensor due to the leak.

Consequently, the readings are compromised, leading to an overall decrease in the reported volume. This scenario clearly illustrates how the integrity of the pneumotach is crucial for precise measurements; any disruption can yield significant inaccuracies in volume assessments.

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