Certified Pulmonary Function Technologist (CPFT) Practice Exam

Question: 1 / 400

What is the primary function of calcium sulfate in pulmonary function testing?

To prevent CO2 production

To absorb moisture

The primary function of calcium sulfate in pulmonary function testing is to absorb moisture. In respiratory testing, especially during the measurement of lung capacities and functions, excess moisture in the air can affect the accuracy of the results. Calcium sulfate acts as a desiccant; it traps water vapor and maintains dry conditions, thereby ensuring that the gas being analyzed is free from humidity, which can skew the data.

In contrast, preventing CO2 production does not relate directly to the function of calcium sulfate in this context. Enhancing gas delivery typically involves modifications to system components rather than the use of a desiccant. Calibration of spirometers is more appropriately done using specific calibration gases and known volumes rather than employing calcium sulfate, which serves a different purpose within the testing environment.

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To enhance gas delivery

To calibrate spirometers

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