Certified Pulmonary Function Technologist (CPFT) Practice Exam

Which gas can be used to sterilize items that cannot get wet?

1. Ozone

2. Carbon Dioxide

3. Ethylene Oxide

4. Hydrogen Peroxide

The correct answer is: Ethylene Oxide

Ethylene Oxide is well-known for its use as a gas sterilant, especially for medical and laboratory equipment that cannot withstand moisture. This method of sterilization is advantageous because Ethylene Oxide penetrates packaging materials and effectively kills a wide range of microorganisms, including bacteria, fungi, and viruses, without the need for heat or liquid, making it suitable for heat-sensitive or moisture-sensitive items. In addition, this gas is effective in low-temperature environments, which is critical for materials that might be damaged by conventional sterilization methods such as steam sterilization. Ethylene Oxide sterilization typically involves exposing items to the gas for a specified time and under controlled temperature and humidity conditions, ensuring thorough and effective sterilization. The other options, while having their own uses in different contexts, do not serve the same purpose as effectively as Ethylene Oxide for items that cannot get wet.