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 membrane used on an arterial blood gas analyzer for measuring partial pressure of oxygen (PO2) is typically Mylar or polypropylene. These materials provide a critical barrier that allows only oxygen to diffuse through while preventing other substances from affecting the measurement. The functionality is essential because the accuracy of PO2 measurements is contingent upon the selective permeability of the membrane. Mylar, known for its excellent chemical resistance and clarity, is often utilized in high-precision applications like blood gas analysis. Polypropylene also offers beneficial properties, including durability and resistance to various solvents, which makes it suitable for a range of medical devices. Overall, the choice of Mylar or polypropylene membranes ensures reliable and accurate readings of PO2 by maintaining the integrity of the measurement while filtering out potential interferences from other gases or liquids present in the sample.