Certified Pulmonary Function Technologist (CPFT) Practice Exam

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Which factor can impact the need to change an absorbent in a PFT machine?

Temperature changes
Color change
Humidity levels
Pressure conditions

The correct answer is: Color change

The need to change an absorbent in a pulmonary function testing (PFT) machine is primarily indicated by a color change. The absorbent materials used in these machines typically change color as they become saturated with the gases they are intended to capture, such as carbon dioxide. This color change serves as a visual cue for technicians, signaling that the absorbent has reached its capacity and needs replacing to ensure accurate test results. Factors such as temperature changes, humidity levels, and pressure conditions can affect the performance and efficiency of the absorbent, but they do not serve as direct indicators for replacement in the same manner as a color change does. Temperature and humidity can influence the rate at which the absorbent becomes saturated, while pressure could affect the overall functioning of the system, but the color change is the definitive signal that indicates when the absorbent is no longer effective.