CRCST Practice Exam

The preferred choice for hydrogen peroxide gas plasma sterilization is Geobacillus stearothermophilus. This is because Geobacillus stearothermophilus is a spore-forming bacterium that is known for its resistance to various sterilization methods, making it an ideal test organism for validating the efficacy of sterilization processes. In this case, using Geobacillus stearothermophilus helps ensure that the sterilization process effectively kills even highly resistant spores, thus confirming the adequacy of the sterilization cycle.