- Certified Medical Device Reprocessing Technician High-Level Disinfection Questions and Answers Flashcards

Which of the following is an example of a high-level disinfectant approved for use in Canadian healthcare facilities?

Answer: Ortho-phthalaldehyde (OPA)

OPA is a widely used high-level disinfectant in Canadian healthcare. It is effective against a broad spectrum of microorganisms, has a shorter contact time than glutaraldehyde, and is less irritating to mucous membranes.

What is the critical difference between high-level disinfection and sterilization?

Answer: High-level disinfection eliminates most microorganisms but may not kill all bacterial spores, while sterilization destroys all forms of microbial life including spores

Sterilization achieves complete destruction of all microorganisms including highly resistant bacterial endospores. High-level disinfection eliminates vegetative bacteria, viruses, fungi, and mycobacteria but may not eliminate all spores, making it suitable for semi-critical but not critical devices.

What must be done if the MEC test of a high-level disinfectant solution fails?

Answer: Discard the solution immediately and replace with fresh disinfectant

A failed MEC test indicates the disinfectant can no longer achieve high-level disinfection. The solution must be discarded and replaced immediately — continuing to use it would put patients at risk of infection.

Why is thorough cleaning essential before high-level disinfection?

Answer: Organic soil remaining on devices can shield microorganisms from the disinfectant and inactivate the chemical agent

Residual organic matter creates a physical barrier that prevents the disinfectant from contacting and killing microorganisms. Additionally, organic soil can chemically react with and deactivate some disinfectants, reducing their effectiveness.

What temperature and contact time parameters are critical for effective high-level disinfection?

Answer: The specific temperature and minimum contact time specified in the disinfectant manufacturer's instructions for use

Each high-level disinfectant has validated parameters — specific minimum temperature and contact time — that must be met to achieve the claimed level of microbial kill. These parameters are determined by the manufacturer through standardized testing.

How often should staff who perform high-level disinfection receive competency assessments?

Answer: At least annually, and whenever new equipment or procedures are introduced

Annual competency assessments ensure that staff maintain their skills and knowledge of current procedures. Additional assessments are needed when new devices, chemicals, or equipment are introduced to the department.