Which statement correctly defines cleaning, disinfection, and sterilization with an example for each?

• A. Cleaning removes debris; disinfection reduces microbial load; sterilization destroys all microorganisms (including spores).
• B. Sterilization uses only heat; disinfection uses chemicals; cleaning uses radiation.
• C. Cleaning plus disinfection are the same; Sterilization is cleaning.
• D. Cleaning sterilizes surfaces; disinfection kills all microorganisms; sterilization reduces microbial load.

Answer: (A)

The main idea is understanding the distinct levels of microbial control and what each one achieves. Cleaning is the first step that physically removes soil, tissue, and other debris from surfaces or instruments using detergent and scrubbing or washing. This removal is crucial because residues can shield microbes from later disinfection or sterilization. An example is washing a surgical instrument with soap and water to remove blood and tissue before any further processing.

Disinfection reduces the number of viable microorganisms on surfaces or instruments to levels considered safe, but it does not guarantee the destruction of all microbes or spores. It’s commonly used on environmental surfaces or noncritical items between cases. An example is wiping down an OR table or other surfaces with a hospital-grade disinfectant to lower contamination.

Sterilization is the highest level of microbial control, aiming to destroy all microorganisms, including spores, and is required for items that will contact sterile tissues. An example is autoclaving wrapped instruments with steam under pressure.

Other statements mix up these roles: sterilization is not limited to heat (chemical sterilants exist); cleaning is not radiation-based; cleaning and disinfection are not the same; and cleaning does not sterilize.