MDRAO High-Level Disinfection

Question 1

High-level disinfection (HLD) is defined as the destruction of all microorganisms EXCEPT:

Accepted Answer

High numbers of bacterial spores

Answer

Vegetative bacteria

Answer

Mycobacteria

Answer

Lipid viruses

Question 2

According to the Spaulding classification, which category of medical devices requires at minimum high-level disinfection?

Accepted Answer

Semi-critical items

Answer

Critical items

Answer

Non-critical items

Answer

Non-contact items

Question 3

Which chemical agent has historically been the most widely used for high-level disinfection of flexible endoscopes?

Accepted Answer

Glutaraldehyde

Answer

Peracetic acid

Answer

Hydrogen peroxide

Answer

Sodium hypochlorite

Question 4

What does MEC stand for in the context of high-level disinfectant solutions?

Accepted Answer

Minimum Effective Concentration

Answer

Maximum Effective Concentration

Answer

Microbial Elimination Count

Answer

Minimum Exposure Cycle

Question 5

Why must items be thoroughly cleaned before high-level disinfection?

Accepted Answer

To remove organic material that can inactivate the disinfectant

Answer

To prevent chemical reactions with the HLD agent

Answer

To reduce the temperature of the solution

Answer

To comply with documentation requirements only

Question 6

Which personal protective equipment (PPE) is MOST important when manually handling glutaraldehyde solutions?

Accepted Answer

Chemical-resistant gloves, face shield, and gown

Answer

Shoe covers and a gown

Answer

Surgical mask and exam gloves

Answer

Safety glasses and a lab coat only

Question 7

What is the FIRST step a technician must perform before placing a device into a high-level disinfectant solution?

Accepted Answer

Test the MEC of the solution

Answer

Check the solution expiry/reuse date

Answer

Rinse the device with sterile water

Answer

Document the batch number