Which statement about high-level disinfection is true?

Which statement about high-level disinfection is true?

• A. Destroys all microorganisms including spores
• B. Heat-automated pasteurization and liquid immersion; time 10-90 minutes
• C. Chemical only disinfection
• D. Used for all items including non-heat sensitive items

Answer: (B)

High-level disinfection targets most microorganisms on semicritical medical devices and is achieved through methods that provide a broader kill spectrum than routine disinfection, though it does not guarantee destruction of all bacterial spores. In many automated reprocessing systems, this level is reached by a heat-assisted step (pasteurization) combined with immersion in a chemical disinfectant, with a defined contact time. This dual approach—a brief heat treatment plus chemical contact—fits the concept of high-level disinfection and reflects how modern reprocessors operate to ensure broad-spectrum efficacy within a practical cycle time (often in the 10–90 minute range). Destroys all microorganisms including spores describes sterilization, not high-level disinfection. Chemical-only disinfection omits the heat-assisted step used in many high-level disinfection cycles, making it incomplete in this context. Using this approach for all items including those not designed for heat exposure would misapply the level of disinfection, since semicritical items require high-level disinfection, while some items or circumstances call for sterilization or lower levels of disinfection.

High-level disinfection targets most microorganisms on semicritical medical devices and is achieved through methods that provide a broader kill spectrum than routine disinfection, though it does not guarantee destruction of all bacterial spores. In many automated reprocessing systems, this level is reached by a heat-assisted step (pasteurization) combined with immersion in a chemical disinfectant, with a defined contact time. This dual approach—a brief heat treatment plus chemical contact—fits the concept of high-level disinfection and reflects how modern reprocessors operate to ensure broad-spectrum efficacy within a practical cycle time (often in the 10–90 minute range).

Destroys all microorganisms including spores describes sterilization, not high-level disinfection. Chemical-only disinfection omits the heat-assisted step used in many high-level disinfection cycles, making it incomplete in this context. Using this approach for all items including those not designed for heat exposure would misapply the level of disinfection, since semicritical items require high-level disinfection, while some items or circumstances call for sterilization or lower levels of disinfection.