CRCST Chapter 9 Practice Test: Disinfection

Disinfection destroys most pathogenic organisms but does not guarantee elimination of all bacterial spores. This chapter covers the three levels of disinfection — high, intermediate, and low — and explains which patient care items require each level based on the Spaulding classification. High-level disinfection (HLD) is required for semi-critical items like endoscopes that contact mucous membranes but do not penetrate sterile tissue. You will learn about approved disinfectant chemistries (glutaraldehyde, ortho-phthalaldehyde, peracetic acid, hydrogen peroxide), proper dilution and contact time requirements, monitoring minimum effective concentration, and the difference between disinfection and sterilization. The chapter also covers automated endoscope reprocessors (AERs) and the critical importance of following manufacturer IFU for every device.