Certified Pulmonary Function Technologist (CPFT) Practice Exam

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Prepare for the Certified Pulmonary Function Technologist Exam with flashcards and multiple-choice questions. Each question comes with hints and explanations. Get started on your path to certification today!

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What is the purpose of a desiccant in a PFT machine?

To cool the device
To absorb CO2
To remove moisture
To provide oxygen

The correct answer is: To remove moisture

The primary purpose of a desiccant in a pulmonary function test (PFT) machine is to remove moisture from the air or gas samples that are being analyzed. Maintaining the correct level of humidity is crucial for accurate measurements in pulmonary function tests. Excess moisture can affect the performance of the equipment and lead to erroneous readings by altering the specific contributions of gases present in the sample. By using a desiccant, the system ensures that the air being analyzed is dry, allowing for more accurate assessments of lung function and gas exchange. In this context, the other options are not relevant to the primary utility of the desiccant; cooling, CO2 absorption, and oxygen provision are functions associated with different components or systems within medical technology but do not pertain to the desiccant's role in a PFT machine.