Certified Pulmonary Function Technologist (CPFT) Practice Exam

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What type of membrane is used on an arterial blood gas analyzer for measuring PO2?

Silicon
Mylar or Polypropylene
Polyethylene
Nylon

The correct answer is: Mylar or Polypropylene

The use of Mylar or Polypropylene membranes on an arterial blood gas analyzer for measuring PO2 is essential due to their selective permeability characteristics. These materials effectively allow oxygen to diffuse through while maintaining a barrier to other gases and environmental influences, ensuring accurate PO2 measurements. Mylar and Polypropylene are also resistant to moisture and chemical interactions that could affect the sensor's performance, enhancing the reliability and precision of the arterial blood gas analysis. In contrast, other materials like Silicon, Polyethylene, and Nylon might not provide the same level of accuracy or selectivity necessary for PO2 measurement. While each has specific applications in various medical and industrial contexts, they do not possess the ideal properties for accurately measuring dissolved oxygen in blood samples as Mylar or Polypropylene do. The optimal balance of permeability and physical stability in Mylar or Polypropylene makes it the preferred choice for this purpose.