Certified Medical Device Reprocessing Technician (CMDRT) — Questions and Answers

Question 1: What ethical responsibilities does a medical device reprocessing technician have?

Ethics only applies to clinicians who treat patients directly
Technicians are ethically obligated to ensure patient safety by maintaining competency, following standards, reporting errors and concerns, and refusing to release items they know are not properly processed (Correct answer)
Technicians have no ethical responsibilities beyond following orders
Ethical responsibilities are limited to maintaining patient confidentiality

Correct answer: Technicians are ethically obligated to ensure patient safety by maintaining competency, following standards, reporting errors and concerns, and refusing to release items they know are not properly processed

Although reprocessing technicians may not interact directly with patients, their work directly impacts patient safety. They have an ethical obligation to maintain standards, report problems, and advocate for safe practices.

Question 2: What is biofilm and why is it particularly concerning in flexible endoscope reprocessing?

A protective film applied by the manufacturer
A structured community of microorganisms encased in a self-produced matrix that is highly resistant to disinfection (Correct answer)
A type of camera lens coating
A type of endoscope lubricant

Correct answer: A structured community of microorganisms encased in a self-produced matrix that is highly resistant to disinfection

Biofilm forms when microorganisms adhere to surfaces and produce a protective extracellular matrix. In the narrow, moist channels of endoscopes, biofilm is extremely difficult to remove and can resist high-level disinfectants, posing a serious infection risk.

Question 3: What type of water should be used for the final rinse of instruments after cleaning?

Distilled or treated water meeting CSA specifications (Correct answer)
Saline solution
Tap water
Soapy water

Correct answer: Distilled or treated water meeting CSA specifications

The final rinse should use distilled, deionized, or reverse-osmosis treated water to prevent mineral deposits (spotting) on instruments and to avoid introducing contaminants that may be present in tap water.

Question 4: What is the role of humidity in ethylene oxide sterilization?

Adequate humidity (typically 40-80% RH) is essential because moisture hydrates bacterial spores, making them more susceptible to ETO penetration and killing (Correct answer)
Humidity is only needed for the aeration phase
Humidity should be eliminated entirely for ETO to work
Humidity has no effect on ETO sterilization

Correct answer: Adequate humidity (typically 40-80% RH) is essential because moisture hydrates bacterial spores, making them more susceptible to ETO penetration and killing

Bacterial spores in a desiccated (dried) state are more resistant to ETO. Humidity during the preconditioning and exposure phases rehydrates spores, allowing ETO gas to penetrate and alkylate the DNA and proteins, achieving microbial kill.

Question 5: Which FDA submission pathway is typically used for moderate-risk Class II medical devices?

Humanitarian Device Exemption (HDE)
510(k) clearance (Correct answer)
Premarket Approval (PMA)
Investigational Device Exemption (IDE)

Correct answer: 510(k) clearance

Class II devices generally require 510(k) clearance, demonstrating substantial equivalence to a legally marketed predicate device.

Question 6: What is a case cart system and how does it relate to sterile storage and distribution?

A type of sterilization container
A method of cleaning instrument carts
A system where all instruments and supplies needed for a specific surgical procedure are assembled onto a dedicated cart and delivered to the OR, improving efficiency and reducing errors (Correct answer)
A system for storing instruments in individual cases permanently

Correct answer: A system where all instruments and supplies needed for a specific surgical procedure are assembled onto a dedicated cart and delivered to the OR, improving efficiency and reducing errors

Case cart systems organize all items needed for a specific surgical case onto one cart, reducing the risk of missing items, decreasing OR setup time, and improving inventory management through standardized pick lists.

Question 7: What is the significance of prion diseases (such as CJD) for medical device reprocessing?

Prions are abnormal proteins that are extremely resistant to standard disinfection and sterilization methods, requiring special reprocessing protocols (Correct answer)
Standard HLD is sufficient for prion decontamination
Prions are easily destroyed by routine sterilization
Prion diseases are not transmissible through medical devices

Correct answer: Prions are abnormal proteins that are extremely resistant to standard disinfection and sterilization methods, requiring special reprocessing protocols

Prions are misfolded proteins that cause fatal neurological diseases and are extraordinarily resistant to conventional disinfection and sterilization methods. Instruments potentially contaminated with prions require special reprocessing protocols or may need to be destroyed.

Question 8: A new type of rigid container system is purchased. According to the CSA Z314-18 standard, what must be documented before this container is put into routine use?

Staff preference survey results for the new container.
The date it was received from the vendor.
Validation and verification of the manufacturer's instructions for use (IFU) within the facility's equipment. (Correct answer)
The cost of the container system compared to the old one.

Correct answer: Validation and verification of the manufacturer's instructions for use (IFU) within the facility's equipment.

Before any new medical device or reprocessing equipment is used, the facility must verify and validate that the manufacturer's instructions for use (IFU) can be successfully followed with their own equipment and processes. This ensures the item can be reliably reprocessed to be safe for patient use and this process must be documented.

Question 9: Why is the CMDRT certification important for patient safety in Canadian healthcare?

It ensures that medical device reprocessing technicians have demonstrated competency in the knowledge and skills needed to prevent healthcare-associated infections (Correct answer)
It only benefits the technician's career advancement
It is a purely administrative requirement with no clinical impact
It is required only for supervisory positions

Correct answer: It ensures that medical device reprocessing technicians have demonstrated competency in the knowledge and skills needed to prevent healthcare-associated infections

CMDRT certification validates that a technician possesses the knowledge and skills to properly clean, disinfect, and sterilize medical devices. This competency is directly linked to patient safety through the prevention of device-related infections.

Question 10: According to CSA Z314-18, what is the very first step in the decontamination process for a soiled reusable medical device?

Application of a disinfectant spray
Ultrasonic cleaning
Thorough cleaning and rinsing (Correct answer)
Immediate sterilization

Correct answer: Thorough cleaning and rinsing

The first and most critical step in the decontamination process is thorough cleaning and rinsing to remove all visible soil and bioburden. If a device is not properly cleaned, subsequent disinfection or sterilization processes can be rendered ineffective. This principle is a cornerstone of medical device reprocessing standards like CSA Z314-18.

Question 11: What is the primary purpose of enzymatic detergent in the decontamination process?

To disinfect work surfaces
To break down organic soil such as blood and tissue (Correct answer)
To lubricate instrument joints
To sterilize instruments

Correct answer: To break down organic soil such as blood and tissue

Enzymatic detergents contain specific enzymes (proteases, lipases, amylases) that break down organic matter like blood, tissue, and body fluids on instruments before further cleaning steps.

Question 12: Why is it important to keep contaminated instruments moist during transport to the reprocessing area?

To make them easier to count
To prevent organic soil from drying and becoming harder to remove (Correct answer)
To sterilize them during transport
To reduce the weight of the instruments

Correct answer: To prevent organic soil from drying and becoming harder to remove

Keeping instruments moist prevents blood, tissue, and other organic materials from drying onto surfaces. Dried soil is significantly harder to clean, can form biofilm, and may compromise subsequent disinfection or sterilization.

Question 13: An MDRT is preparing a load for an Ethylene Oxide (EO) sterilizer. Which of the following is a critical parameter that must be controlled and monitored for a successful EO sterilization cycle?

Generation of a plasma state
Acidic pH level
Relative humidity (Correct answer)
Deep vacuum pressure below 1 millibar

Correct answer: Relative humidity

The effectiveness of Ethylene Oxide (EO) sterilization depends on the simultaneous control of four essential parameters: gas concentration, temperature, exposure time, and relative humidity. Humidity is crucial because water molecules help carry the EO gas to the microbial DNA to destroy it.

Question 14: What are additional precautions, and when are they implemented in the reprocessing department?

Infection-specific measures (contact, droplet, airborne) added on top of routine practices when a patient is known or suspected to have a transmissible infection (Correct answer)
Extra cleaning steps performed only on Mondays
Precautions used only during construction in the hospital
They are the same as routine practices

Correct answer: Infection-specific measures (contact, droplet, airborne) added on top of routine practices when a patient is known or suspected to have a transmissible infection

Additional precautions supplement routine practices when a specific transmissible infection is identified. In reprocessing, this may mean enhanced PPE, dedicated reprocessing equipment, or specific handling protocols for instruments used on patients under additional precautions.

Question 15: What is the primary purpose of an instrument count sheet for a loaner set?

To verify all instruments are accounted for before, during, and after the surgical procedure (Correct answer)
To document the rental cost and invoice details
To identify which SPD technician processed the instruments
To record the sterilization parameters used for the set

Correct answer: To verify all instruments are accounted for before, during, and after the surgical procedure

The count sheet serves as a verification tool that ensures no instruments are missing or retained during the procedure, protecting patient safety and enabling accurate set return to the vendor.

Question 16: A technician is manually cleaning a flexible colonoscope. After thoroughly brushing all accessible channels while the scope is fully submerged in an enzymatic solution, what is the critical next step before moving to the final rinse stage?

Visually inspect the scope's exterior for damage with a magnifying lamp.
Flush the channels with 70% isopropyl alcohol to begin disinfection.
Actuate all movable parts and raise/lower elevators to dislodge trapped debris. (Correct answer)
Perform a second leak test to ensure the brushing did not cause damage.

Correct answer: Actuate all movable parts and raise/lower elevators to dislodge trapped debris.

After the initial brushing of the channels, it is critical to actuate any moving parts, such as the elevator on a duodenoscope or angulation controls, while the scope is still submerged in the cleaning solution. This action helps to dislodge and remove bioburden that may be trapped in these complex mechanical areas, ensuring they are thoroughly cleaned.

Question 17: Why is aeration important after ethylene oxide sterilization?

To remove residual ethylene oxide gas absorbed by device materials, which is toxic to patients and staff (Correct answer)
Aeration is optional and can be skipped
To cool the instruments down
To dry the instruments

Correct answer: To remove residual ethylene oxide gas absorbed by device materials, which is toxic to patients and staff

ETO gas is absorbed by many materials during sterilization. Without adequate aeration, residual ETO on devices can cause burns, irritation, hemolysis, and other toxic reactions in patients, and poses an inhalation hazard to staff.

Question 18: What is the purpose of the conditioning phase in a prevacuum sterilizer?

To test the sterilizer's alarm system
To cool the instruments before sterilization
To dry the instruments before the exposure phase
To remove air from the chamber through alternating vacuum pulls and steam pulses, ensuring complete steam penetration to all surfaces (Correct answer)

Correct answer: To remove air from the chamber through alternating vacuum pulls and steam pulses, ensuring complete steam penetration to all surfaces

The conditioning phase uses multiple cycles of vacuum (pulling air out) and steam injection (displacing remaining air) to achieve thorough air removal. Trapped air is the primary enemy of steam sterilization as it prevents steam contact.

Question 19: An MDRT is preparing to transport several sterile instrument trays from the MDRD to an operating room on another floor. Which of the following is the most appropriate method for transporting these items?

Stacking the trays carefully on an open utility cart.
Using the same cart that transports soiled items after wiping it with a disinfectant.
Placing the trays in a clean, dedicated, covered cart. (Correct answer)
Carrying the trays by hand, ensuring they remain level.

Correct answer: Placing the trays in a clean, dedicated, covered cart.

Sterile items must be transported in a manner that protects them from environmental contamination and physical damage. A clean, dedicated, and covered cart is the standard method to maintain the integrity of the sterile barrier during transit between departments.

Question 20: A medical device reprocessing department is deciding between Ethylene Oxide (EO) and Vaporized Hydrogen Peroxide (VHP) for a new low-temperature sterilizer. A key consideration is the post-cycle processing time. What is a primary disadvantage of EO compared to VHP in this regard?

EO cycles are significantly hotter.
EO cannot be used for devices with long lumens.
EO sterilizers require more frequent maintenance.
EO requires a lengthy aeration period to remove toxic residues. (Correct answer)

Correct answer: EO requires a lengthy aeration period to remove toxic residues.

Ethylene Oxide is a toxic and carcinogenic gas that can be absorbed by certain materials. Therefore, after the sterilization cycle, a mandatory aeration period (which can last for several hours) is required to allow the residual gas to dissipate to safe levels before the devices can be handled or used. VHP does not have this requirement.

Question 21: What tracking system must be used for loaner implantable medical devices?

No special tracking is required beyond normal inventory
A system that links the device to the specific patient's medical record (Correct answer)
Serial number tracking only in the vendor's system
Lot number tracking only in the SPD logbook

Correct answer: A system that links the device to the specific patient's medical record

The FDA Safe Medical Devices Act and accreditation standards require implantable devices to be tracked and linked to the patient's medical record to enable recall tracing if needed.

Question 22: Why must the minimum effective concentration (MEC) of high-level disinfectant be tested before each use?

To determine the solution's colour
To ensure the disinfectant is still potent enough to achieve high-level disinfection (Correct answer)
To check the solution's temperature
To measure the pH level only

Correct answer: To ensure the disinfectant is still potent enough to achieve high-level disinfection

High-level disinfectant solutions lose potency over time and with repeated use due to dilution and organic loading. MEC testing with chemical test strips confirms the solution still meets the minimum concentration required for effective microbial kill.

Question 23: When manually cleaning reusable medical devices, what is the primary reason for using a neutral pH detergent?

To activate the chemical indicators
To meet the requirements for thermal disinfection
To prevent corrosion and damage to the instruments (Correct answer)
To ensure the instruments are sterile after cleaning

Correct answer: To prevent corrosion and damage to the instruments

Using a neutral pH detergent is crucial for preventing damage to surgical instruments. Highly acidic or alkaline solutions can cause corrosion, pitting, and staining, which can compromise the integrity and function of the device. The other options are incorrect; detergents do not activate chemical indicators, cleaning does not equal sterilization, and detergent choice is separate from thermal disinfection parameters.

Question 24: What respiratory protection may be required for reprocessing staff and when?

Only surgical masks are ever needed
Respiratory protection is only required during outbreaks
Respiratory protection is never needed in reprocessing
Respiratory protection such as N95 respirators or chemical cartridge respirators may be required when engineering controls are insufficient to keep airborne chemical concentrations below OELs (Correct answer)

Correct answer: Respiratory protection such as N95 respirators or chemical cartridge respirators may be required when engineering controls are insufficient to keep airborne chemical concentrations below OELs

When engineering controls (ventilation) cannot adequately control airborne exposure to chemical vapours (glutaraldehyde, ETO, OPA), appropriate respiratory protection must be provided, fitted, and used according to a respiratory protection program.

Question 25: Which document must a sterile processing department maintain to demonstrate that a sterilizer has been properly validated for a specific load configuration?

Employee time sheets
Purchase order
Infection control committee minutes
Load qualification or validation records (Correct answer)

Correct answer: Load qualification or validation records

Load qualification/validation records document that a sterilization process has been tested and confirmed to achieve sterility for specific device types and load configurations.

Question 26: What documentation is required after each flexible endoscope reprocessing cycle?

Only the endoscope model number
Patient name, endoscope serial number, reprocessing date/time, staff initials, AER cycle parameters, and chemical test results (Correct answer)
No documentation is needed if the process went smoothly
Only the date of reprocessing

Correct answer: Patient name, endoscope serial number, reprocessing date/time, staff initials, AER cycle parameters, and chemical test results

Comprehensive documentation enables traceability between patient, procedure, and reprocessing cycle. This is essential for quality assurance, outbreak investigation, and regulatory compliance in Canadian healthcare facilities.

Question 27: Which of the following best describes an enzymatic presoak or spray used at the point of use?

A high-level disinfectant that kills all microorganisms
A proteolytic or multi-enzyme solution that begins breaking down proteins and organic debris to facilitate cleaning (Correct answer)
An EPA-registered disinfectant that meets OSHA standards
A sterilizing agent approved for terminal processing

Correct answer: A proteolytic or multi-enzyme solution that begins breaking down proteins and organic debris to facilitate cleaning

Enzymatic presoaks contain proteases and other enzymes that begin digesting blood, tissue, and other organic debris, making manual and automated cleaning more effective.

Question 28: Which of the following BEST describes the manual cleaning process of surgical instruments?

Holding the instrument under warm running water
Soaking the instrument in a detergent solution for 10 minutes.
Scrubbing the instrument in a detergent solution. (Correct answer)
Wiping the instruments with a dry towel

Correct answer: Scrubbing the instrument in a detergent solution.

The manual cleaning process of surgical instrumental involves scrubbing the instrument in a detergent solution. This method ensures that any debris, blood or other contaminants are effectively removed from the instrument's surface. Scrubbing helps to physically dislodge and remove any organic material, ensuring that the instrument is thoroughly cleaned before further processing or sterilization.

Question 29: What are the occupational health risks associated with glutaraldehyde exposure during high-level disinfection?

There are no health risks with glutaraldehyde
Only mild skin dryness
Respiratory sensitization, skin dermatitis, eye irritation, and asthma-like symptoms (Correct answer)
Temporary colour changes to the skin

Correct answer: Respiratory sensitization, skin dermatitis, eye irritation, and asthma-like symptoms

Glutaraldehyde is a known respiratory sensitizer and skin sensitizer. Repeated or acute exposure can cause occupational asthma, allergic contact dermatitis, eye irritation, headaches, and nose/throat irritation. Proper PPE and ventilation are essential.

Question 30: Which types of materials are NOT compatible with hydrogen peroxide gas plasma sterilization?

Cellulose-based materials (paper, cotton, linen), liquids, and devices with long narrow lumens below specified dimensions (Correct answer)
Stainless steel instruments
Titanium instruments
Silicone tubing within specifications

Correct answer: Cellulose-based materials (paper, cotton, linen), liquids, and devices with long narrow lumens below specified dimensions

Cellulose-based materials absorb hydrogen peroxide and prevent plasma formation. Liquids are not compatible because the process requires a deep vacuum. Long narrow lumens may not allow adequate peroxide penetration to achieve sterilization.

Question 31: What should a reprocessing technician do immediately after sustaining a needlestick injury from a contaminated instrument?

Apply a bandage and continue working
Continue working and report it at the end of the shift
Immediately wash the site with soap and water, report the incident to the supervisor, and seek medical assessment according to the facility's post-exposure protocol (Correct answer)
Squeeze the wound vigorously to push out blood

Correct answer: Immediately wash the site with soap and water, report the incident to the supervisor, and seek medical assessment according to the facility's post-exposure protocol

Prompt first aid (washing with soap and water) and immediate reporting are essential for timely post-exposure assessment, prophylaxis (if indicated), and follow-up testing for bloodborne pathogens.

Question 32: Which of the following is the most critical first step in the decontamination process for reusable medical devices?

Immediate sterilization after use.
Application of a high-level disinfectant.
Wrapping the device for transport to the clean assembly area.
Thorough manual or mechanical cleaning. (Correct answer)

Correct answer: Thorough manual or mechanical cleaning.

Cleaning is the essential first step in reprocessing. It removes organic soil, such as blood and tissue, which can shield microorganisms from disinfection or sterilization processes. If an instrument is not properly cleaned, subsequent disinfection or sterilization steps may be ineffective.

Question 33: If a technician discovers that a chemical indicator from a processed load shows a failure, but the load has already been sent to the sterile storage area, what does the quality system require them to do immediately?

Reprocess the next load using a longer cycle time.
Initiate a recall of the entire sterilization load. (Correct answer)
Document the failure in their personal notes for future reference.
Wait until the next shift to see if anyone else notices.

Correct answer: Initiate a recall of the entire sterilization load.

A failed chemical indicator signifies a potential sterilization failure. The quality system mandates immediate action to prevent patient harm, which includes recalling all items from the suspect load to be reprocessed. This process must be documented thoroughly.

Question 34: Healthcare workers are most likely to be infected by which of the following agents?

Rubella
Hepatitis B (Correct answer)
Human immunodeficiency virus
Pneumococcus

Correct answer: Hepatitis B

Healthcare workers are most likely to be infected by Hepatitis B because it is bloodborne virus that can be transmitted through exposure to infected blood or body fluids. Healthcare workers often come into contact with blood and other bodily fluids during their work, which puts them at a higher risk of contracting Hepatitis B compared to other agents listed.

Question 35: When using an Automated Endoscope Reprocessor (AER) for high-level disinfection, which of the following sets of tasks must the technician perform before loading the endoscope into the machine?

Testing the MEC of the rinse water and initiating the thermal disinfection phase.
Drying the channels with compressed air and documenting the cycle parameters.
Point-of-use pre-cleaning, leak testing, and thorough manual cleaning. (Correct answer)
Packaging the endoscope in a peel pouch and adding a chemical indicator.

Correct answer: Point-of-use pre-cleaning, leak testing, and thorough manual cleaning.

An AER automates the high-level disinfection, rinsing, and drying stages, but it does not replace the essential manual preparation steps. [18, 24] Meticulous manual cleaning is the most critical step in the entire process to remove bioburden. [24] Leak testing is also performed before immersion to prevent costly damage to the endoscope. [5] If it is not clean, it cannot be high-level disinfected.

Question 36: What is the role of an infection prevention and control (IPAC) committee in relation to the reprocessing department?

The IPAC committee provides oversight, policy development, surveillance, and outbreak investigation support for the reprocessing department (Correct answer)
The IPAC committee has no authority over reprocessing
The IPAC committee manages hospital finances
The IPAC committee only handles patient complaints

Correct answer: The IPAC committee provides oversight, policy development, surveillance, and outbreak investigation support for the reprocessing department

The IPAC committee provides governance and expert guidance for reprocessing activities, including developing policies, reviewing practices, investigating incidents, and ensuring compliance with national and provincial standards.

Question 37: According to the Spaulding classification, which category requires sterilization because items enter sterile tissue or the vascular system?

Critical (Correct answer)
Environmental
Noncritical
Semi-critical

Correct answer: Critical

Critical items, such as surgical instruments, penetrate sterile tissue or the vascular system and must be sterilized to prevent infection.

Question 38: What must be performed immediately after a flexible endoscope is used on a patient?

Full immersion in sterilant
Running it through an automated endoscope reprocessor
Placing it directly into a transport container without any treatment
Bedside pre-cleaning including wiping the insertion tube and suctioning enzymatic detergent through channels (Correct answer)

Correct answer: Bedside pre-cleaning including wiping the insertion tube and suctioning enzymatic detergent through channels

Bedside pre-cleaning is critical to prevent organic soil from drying in the endoscope channels. This includes wiping the exterior and suctioning enzymatic solution through the air/water and suction channels while the endoscope is still connected to the light source.

Question 39: When should immediate-use steam sterilization (IUSS) be used for implantable devices?

Whenever the loaner set arrives late
For all loaner implants that arrive pre-sterilized
Only in documented emergency situations when no alternative exists (Correct answer)
Routinely, as it saves processing time

Correct answer: Only in documented emergency situations when no alternative exists

AORN and IAHCSMM guidelines strongly discourage IUSS for implants and permit it only in documented emergencies where no alternative is available, due to the increased risk of complications.

Question 40: Why is continuing education important for certified medical device reprocessing technicians?

Continuing education is only needed for supervisors
Continuing education is not necessary after initial certification
Once the certification exam is passed, no further learning is required
Technology, standards, and best practices in reprocessing evolve continuously, requiring ongoing education to maintain competency and certification (Correct answer)

Correct answer: Technology, standards, and best practices in reprocessing evolve continuously, requiring ongoing education to maintain competency and certification

The field of medical device reprocessing evolves with new technologies, devices, chemicals, and updated standards. Continuing education ensures technicians remain current and competent, which is essential for patient safety and certification maintenance.

Question 41: What is the importance of instrument tracking systems in medical device reprocessing?

They are only used for billing purposes
They only track the location of instruments
Tracking systems enable traceability from the patient to every step of reprocessing, support recall management, optimize instrument utilization, and meet regulatory requirements (Correct answer)
Tracking systems are too expensive and not worth implementing

Correct answer: Tracking systems enable traceability from the patient to every step of reprocessing, support recall management, optimize instrument utilization, and meet regulatory requirements

Instrument tracking systems create a complete audit trail linking each device to the patient procedure, cleaning, inspection, packaging, sterilization cycle, and storage. This traceability is essential for recalls, quality assurance, and regulatory compliance.

Question 42: Why must instruments with lumens receive special attention during decontamination?

Lumens do not need sterilization
Soil and biofilm can accumulate inside narrow channels where standard cleaning cannot reach (Correct answer)
Instruments with lumens are always single-use
Lumens are more expensive to replace

Correct answer: Soil and biofilm can accumulate inside narrow channels where standard cleaning cannot reach

Lumened instruments have narrow internal channels where blood, tissue, and biofilm can accumulate and are difficult to reach with standard cleaning methods. They require specific brushing, flushing, and sometimes ultrasonic cleaning to ensure adequate decontamination.

Question 43: Rod-Shaped bacteria is called?

Flagella
Bacilli (Correct answer)
Cocci
Spiral

Correct answer: Bacilli

Bacilli is the correct answer because rod-shaped bacteria are commonly referred to as bacilli. This shape is characterized by a cylindrical or elongated structure, similar to a rod or a stick. Other types of bacteria may have different shapes, such as spherical (cocci) or spiral, but when bacteria are rod-shaped, they are classified as bacilli.

Question 44: In the chain of infection, what role does a contaminated surgical instrument play?

Infectious agent.
Portal of exit.
Susceptible host.
Mode of transmission. (Correct answer)

Correct answer: Mode of transmission.

The chain of infection consists of six links. A contaminated instrument serves as a vehicle, or fomite, that transfers the infectious agent from the reservoir to the susceptible host. This makes it the 'mode of transmission'. The infectious agent is the pathogen itself, not the object carrying it.

Question 45: What is the proper response when a reprocessing breach (failure in the sterilization or disinfection process) is identified?

Immediately quarantine affected items, notify IPAC and management, initiate a patient notification and recall if necessary, investigate root cause, and implement corrective actions (Correct answer)
Wait until the next scheduled audit to report it
Only document it for future reference
Ignore it if no infections have been reported

Correct answer: Immediately quarantine affected items, notify IPAC and management, initiate a patient notification and recall if necessary, investigate root cause, and implement corrective actions

A reprocessing breach requires immediate action: quarantine affected devices, notify the IPAC team and management, assess patient risk, potentially notify affected patients, investigate the root cause, and implement corrective measures to prevent recurrence.

Question 46: What is the minimum recommended contact time for most enzymatic detergents to be effective?

The manufacturer's recommended contact time, typically 1 to 10 minutes (Correct answer)
2 hours
30 minutes
5 seconds

Correct answer: The manufacturer's recommended contact time, typically 1 to 10 minutes

Enzymatic detergents require adequate contact time to break down organic soil. The specific time varies by product, but manufacturers typically recommend 1 to 10 minutes, and their instructions for use (IFU) must always be followed.

Question 47: Which of the following is an example of a high-level disinfectant approved for use in Canadian healthcare facilities?

Household bleach at standard dilution
Ortho-phthalaldehyde (OPA) (Correct answer)
Quaternary ammonium compounds
Isopropyl alcohol 70%

Correct 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.

Question 48: What role does hand hygiene play in infection prevention for reprocessing technicians?

It is the single most effective measure for preventing the transmission of healthcare-associated infections (Correct answer)
It is only required at the beginning of a shift
It replaces the need for gloves in the decontamination area
It is only necessary before eating

Correct answer: It is the single most effective measure for preventing the transmission of healthcare-associated infections

Hand hygiene — through handwashing with soap and water or using alcohol-based hand rub — is recognized worldwide as the most effective single measure to prevent healthcare-associated infection transmission, including in reprocessing departments.

Question 49: What is the difference between a Type 5 (integrating) and Type 6 (emulating) chemical indicator?

Type 5 is placed outside packages and Type 6 inside
There is no difference
Type 6 is less accurate than Type 5
A Type 5 integrates all critical parameters and is designed to correlate with BI performance, while a Type 6 is designed to react to all critical parameters of a specific sterilization cycle type (Correct answer)

Correct answer: A Type 5 integrates all critical parameters and is designed to correlate with BI performance, while a Type 6 is designed to react to all critical parameters of a specific sterilization cycle type

Type 5 integrating indicators respond to all critical sterilization parameters with stated values that correlate with BI kill, making them versatile across cycle types. Type 6 emulating indicators are cycle-specific, designed to respond to the exact parameters of one particular cycle.

Question 50: A hospital's MDRD is processing a load containing both metal instruments and porous textile items. Which type of steam sterilization cycle is most appropriate for this mixed load?

A dynamic air removal (prevacuum) cycle (Correct answer)
A gravity displacement cycle
A flash sterilization cycle
A dry heat sterilization cycle

Correct answer: A dynamic air removal (prevacuum) cycle

A dynamic air removal cycle, such as a prevacuum or SFPP cycle, is the preferred method for sterilizing porous items like textiles and complex instruments. The active air removal ensures that steam can effectively penetrate the porous materials and lumens, which is a significant challenge for gravity displacement cycles where air can become trapped. Flash sterilization is for urgent, unwrapped items, and dry heat is a different method entirely.

Question 51: What are routine practices (formerly universal precautions) in the context of infection prevention?

Precautions taken only when handling sharps
A set of infection prevention measures applied to ALL patients and situations regardless of known infection status (Correct answer)
Practices limited to operating room staff only
Special precautions used only during outbreaks

Correct answer: A set of infection prevention measures applied to ALL patients and situations regardless of known infection status

Routine practices are applied universally because any patient may carry undiagnosed infections. In reprocessing, this means treating all instruments as potentially contaminated and following full decontamination protocols regardless of the patient's known infection status.

Question 52: What is the Spaulding classification of a laryngoscope blade, and what minimum reprocessing level does it require?

Semi-critical — requires at minimum high-level disinfection (Correct answer)
It depends on the patient's diagnosis
Non-critical — low-level disinfection only
Critical — requires sterilization

Correct answer: Semi-critical — requires at minimum high-level disinfection

Laryngoscope blades contact mucous membranes of the oropharynx and are therefore classified as semi-critical devices. They require at minimum high-level disinfection, though many Canadian facilities have moved to using sterilizable or single-use blades.

Question 53: A flexible endoscope, which is used to visualize the gastrointestinal tract, comes into contact with mucous membranes. According to the Spaulding Classification system, how should this device be categorized and reprocessed?

Semi-critical; requires, at a minimum, high-level disinfection. (Correct answer)
Non-critical; requires low-level disinfection.
Non-critical; requires cleaning with detergent and water.
Critical; requires sterilization.

Correct answer: Semi-critical; requires, at a minimum, high-level disinfection.

The Spaulding Classification system categorizes medical devices based on the risk of infection involved with their use. Devices that contact mucous membranes or non-intact skin, like flexible endoscopes, are considered semi-critical. The minimum required reprocessing for semi-critical devices is high-level disinfection (HLD), although sterilization is preferred when possible.

Question 54: During the manual cleaning of an endoscope, a technician uses a steel wire brush to clean the internal channel. Why is this action incorrect and what should be used instead?

It is incorrect; only enzymatic foam should be used, with no brushing required.
It is incorrect; a metal brush can damage the channel lining, and a soft, plastic bristle brush should be used. (Correct answer)
It is correct; steel brushes are needed for tough bioburden.
It is incorrect; channels should only be flushed and not brushed.

Correct answer: It is incorrect; a metal brush can damage the channel lining, and a soft, plastic bristle brush should be used.

Using abrasive materials like steel wool or wire brushes can scratch and damage the surfaces of medical devices, especially the delicate internal channels of endoscopes. These scratches can harbor microorganisms and make future cleaning more difficult. The correct procedure is to use brushes with soft, non-abrasive bristles, typically plastic, that are of the appropriate size for the lumen or channel being cleaned.

Question 55: What documentation responsibilities does a reprocessing technician have?

Documentation is unnecessary if the work is done correctly
Technicians must accurately document all processes including sterilization parameters, quality test results, equipment maintenance, non-conformances, and traceability records (Correct answer)
Documentation is only needed for accreditation surveys
Only supervisors are responsible for documentation

Correct answer: Technicians must accurately document all processes including sterilization parameters, quality test results, equipment maintenance, non-conformances, and traceability records

Complete and accurate documentation is essential for traceability, quality assurance, regulatory compliance, and patient safety. The principle of 'if it wasn't documented, it wasn't done' applies throughout reprocessing.

Question 56: What is the technician's responsibility regarding manufacturer's instructions for use (IFU)?

IFU are only for new staff members
Following IFU is the supervisor's responsibility, not the technician's
The technician must follow the manufacturer's IFU for every device and chemical product, and must access and reference them regularly (Correct answer)
IFU can be ignored if the technician has experience

Correct answer: The technician must follow the manufacturer's IFU for every device and chemical product, and must access and reference them regularly

Manufacturer's IFU provide the validated method for safely reprocessing each specific device. Following them is both a legal requirement and essential for patient safety, regardless of the technician's experience level.

Question 57: What is the purpose of performing a protein residual test on cleaned instruments?

To verify that cleaning has adequately removed organic soil from instrument surfaces (Correct answer)
To determine the manufacturer of the instrument
To test the strength of the metal
To check if sterilization was achieved

Correct answer: To verify that cleaning has adequately removed organic soil from instrument surfaces

Protein residual tests detect trace amounts of protein remaining on instrument surfaces after cleaning. A positive result indicates inadequate cleaning, which can compromise subsequent sterilization and patient safety.

Question 58: What is the correct sequence of steps in the decontamination workflow?

Transport → Sterilization → Cleaning → Inspection
Packaging → Sterilization → Cleaning → Storage
Pre-cleaning at point of use → Transport → Cleaning → Rinsing → Disinfection/Sterilization (Correct answer)
Sterilization → Cleaning → Disinfection → Rinsing

Correct answer: Pre-cleaning at point of use → Transport → Cleaning → Rinsing → Disinfection/Sterilization

The standard decontamination workflow follows a logical progression: pre-cleaning at point of use to prevent soil from drying, safe transport to the reprocessing area, thorough cleaning, rinsing, and then disinfection or sterilization.

Question 59: A tray of complex surgical instruments with lumens and box locks arrives in the decontamination area. After manual cleaning, what is the most effective process for removing fine, unseen debris from hard-to-reach areas?

Washer-disinfector cycle
Rinsing with sterile water
Ultrasonic cleaning (Correct answer)
High-level disinfection soak

Correct answer: Ultrasonic cleaning

Ultrasonic cleaning uses a process called cavitation, where microscopic bubbles implode on instrument surfaces, to effectively dislodge and remove soil from areas that are difficult to access manually, such as crevices, joints, and lumens. A washer-disinfector is effective but may not reach all intricate parts as well as cavitation. High-level disinfection and rinsing are subsequent steps, not the primary method for removing fine debris.

Question 60: After manually cleaning contaminated surgical instruments with disinfectant solution, the NEXT step in the decontamination process is?

Sterilizing
Storing
Rinsing (Correct answer)
Lubricating

Correct answer: Rinsing

After manually cleaning contaminated surgical instruments with a disinfectant solution, the next step in the decontamination process is rinsing. Rinsing is necessary to remove any reside or remaining disinfectant solution from the instruments. This helps to ensure that the instruments are thoroughly cleaned and ready for the next step in the process, such as lubricating, storing or sterilizing.

Question 61: Which type of biological indicator (BI) is used to monitor the efficacy of both Vaporized Hydrogen Peroxide (VHP) and Hydrogen Peroxide Gas Plasma sterilization cycles?

Bacillus subtilis spores
Clostridium sporogenes spores
Geobacillus stearothermophilus spores (Correct answer)
Bacillus atrophaeus spores

Correct answer: Geobacillus stearothermophilus spores

Geobacillus stearothermophilus spores are highly resistant to both steam and vaporized hydrogen peroxide sterilization processes, making them the standard microorganism used in biological indicators for these methods.

Question 62: What would you describe this?

Spore
Protozoa
Spirochete (Correct answer)
Spherical

Correct answer: Spirochete

A spirochete is a type of bacteria that has a spiral or corkscrew shape. It is known for its flexile body and its ability to move in corkscrew-like motion. Spirochetes are found in various environments, including water and soil, as well as in the bodies of humans and animals. They can cause disease such as in the bodies of humans and animals. They can cause disease such as syphilis and Lyme disease.

Question 63: Which cleaning method uses high-frequency sound waves to remove soil from instruments?

Autoclave
Pasteurizer
Ultrasonic cleaner (Correct answer)
Washer-disinfector

Correct answer: Ultrasonic cleaner

Ultrasonic cleaners use high-frequency sound waves (typically 35-47 kHz) to create cavitation bubbles in the cleaning solution. These bubbles implode on contact with instrument surfaces, dislodging soil from hard-to-reach areas.

Question 64: What temperature and contact time parameters are critical for effective high-level disinfection?

The specific temperature and minimum contact time specified in the disinfectant manufacturer's instructions for use (Correct answer)
Room temperature for 5 minutes regardless of the product
Boiling temperature for 30 seconds
Any temperature for any duration

Correct 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.

Question 65: What are the primary safety hazards associated with ethylene oxide sterilization?

ETO only causes mild skin dryness
The only hazard is the heat generated during the cycle
ETO is completely safe with no hazards
ETO is a toxic, carcinogenic, mutagenic, and flammable gas requiring strict exposure controls and monitoring (Correct answer)

Correct answer: ETO is a toxic, carcinogenic, mutagenic, and flammable gas requiring strict exposure controls and monitoring

ETO is classified as a known human carcinogen and is mutagenic, making it a significant occupational health hazard. Canadian OELs are very low, and strict engineering controls, monitoring, and safety protocols are required.

Question 66: What is the primary purpose of a biological indicator (BI) in implant sterilization?

To detect the presence of prions in the sterilization chamber
To monitor only the physical temperature parameters of the cycle
To verify that conditions sufficient to destroy the most resistant microorganisms were achieved (Correct answer)
To measure the chemical concentration of the sterilant used

Correct answer: To verify that conditions sufficient to destroy the most resistant microorganisms were achieved

Biological indicators contain highly resistant spore-forming organisms and confirm that the sterilization process was effective enough to kill the most resistant form of microbial life.

Question 67: What types of records must be maintained for steam sterilization cycles?

Complete cycle records including mechanical printouts (time, temperature, pressure), chemical indicator results, biological indicator results, load contents, and operator identification (Correct answer)
Only biological indicator results
Only a log of how many cycles were run
No records are required if the sterilizer is new

Correct answer: Complete cycle records including mechanical printouts (time, temperature, pressure), chemical indicator results, biological indicator results, load contents, and operator identification

Comprehensive sterilization records are essential for demonstrating process compliance, enabling traceability, and investigating sterilization failures. CSA Z314.3 specifies the minimum documentation requirements for every sterilization cycle.

Question 68: Why is the drying phase important in steam sterilization?

The drying phase sterilizes the outside of packages
Adequate drying prevents wet packs, which compromise the sterile barrier by allowing microbial migration through moisture on the packaging (Correct answer)
Drying is optional and can be skipped to save time
Drying makes instruments shine

Correct answer: Adequate drying prevents wet packs, which compromise the sterile barrier by allowing microbial migration through moisture on the packaging

Residual moisture on sterilized packages (wet packs) creates a pathway for microorganisms to wick through the packaging material, compromising sterility. The drying phase uses vacuum and heat to remove condensate.

Question 69: What is ethylene oxide (ETO) sterilization and when is it used in medical device reprocessing?

A chemical sterilization method using ETO gas for heat-sensitive and moisture-sensitive devices that cannot withstand steam sterilization (Correct answer)
A radiation-based sterilization technique
A type of steam sterilization at low pressure
A manual cleaning method using ETO liquid

Correct answer: A chemical sterilization method using ETO gas for heat-sensitive and moisture-sensitive devices that cannot withstand steam sterilization

ETO sterilization uses ethylene oxide gas to sterilize medical devices that would be damaged by the high temperatures and moisture of steam sterilization, such as flexible endoscopes, certain plastics, electronics, and battery-powered devices.

Question 70: What is the recommended maximum time between point-of-use treatment and initiation of the decontamination process?

24 hours regardless of moisture status
There is no time limit if instruments are kept in a closed container
Instruments should be reprocessed as soon as possible; extended delays increase biofilm risk and complicate cleaning (Correct answer)
48 hours if instruments are kept moist

Correct answer: Instruments should be reprocessed as soon as possible; extended delays increase biofilm risk and complicate cleaning

Instruments should be decontaminated as soon as possible after use, as delays allow biofilm formation and organic material hardening, which compromises cleaning effectiveness.

Question 71: Which microorganisms are used as benchmark test organisms to validate the efficacy of high-level disinfection?

Mycobacterium species (such as M. terrae or M. bovis) because of their high resistance to chemical disinfectants (Correct answer)
Only E. coli
Common cold viruses
Only fungal spores

Correct answer: Mycobacterium species (such as M. terrae or M. bovis) because of their high resistance to chemical disinfectants

Mycobacteria are among the most resistant vegetative organisms to chemical disinfection. If an HLD agent can kill mycobacteria within the specified parameters, it is expected to be effective against less resistant organisms like bacteria, viruses, and fungi.

Question 72: What should SPD do if a biological indicator from an implant sterilization load returns a positive (growth) result?

Allow the surgeon to decide whether to use the implant based on clinical need
Release the implant if all chemical indicators in the load passed
Re-sterilize the implant and release it without additional BI testing
Quarantine and recall the load; do not use the implant until the issue is investigated and resolved (Correct answer)

Correct answer: Quarantine and recall the load; do not use the implant until the issue is investigated and resolved

A positive BI result indicates a potential sterilization failure; the entire load must be quarantined and recalled, and the implant must not be used until a thorough investigation is completed and the issue resolved.

Question 73: After a successful low-temperature sterilization cycle using hydrogen peroxide gas plasma, a technician opens the sterilizer door. What is the immediate next step regarding the processed devices?

They require a quarantine period in a negative pressure room.
They must be placed in an aerator for 8-12 hours.
They need to be rinsed with sterile water to remove residue.
They can be handled safely and are ready for immediate use or storage. (Correct answer)

Correct answer: They can be handled safely and are ready for immediate use or storage.

A significant advantage of hydrogen peroxide gas plasma sterilization is that the byproducts are non-toxic (water vapor and oxygen), eliminating the need for an aeration period. Once the cycle is complete, the items can be safely handled and are ready for use or storage.

Question 74: Why should sterile items not be stored on the floor or near external walls in the storage area?

Floor and wall storage saves space and is preferred
Floor storage exposes items to splash contamination and pest damage, while external walls can create temperature fluctuations and condensation that compromise packaging integrity (Correct answer)
External walls provide better ventilation
Items are safer on the floor because they cannot fall

Correct answer: Floor storage exposes items to splash contamination and pest damage, while external walls can create temperature fluctuations and condensation that compromise packaging integrity

Items stored on the floor are vulnerable to contamination from floor-cleaning solutions, foot traffic, pests, and flooding. External walls may experience temperature variations and condensation that can compromise the sterile barrier of packages stored against them.

Question 75: Why is thorough cleaning essential before high-level disinfection?

Cleaning removes the need for disinfection
Cleaning only affects the appearance of instruments
Organic soil remaining on devices can shield microorganisms from the disinfectant and inactivate the chemical agent (Correct answer)
Cleaning is optional if using a strong disinfectant

Correct 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.

Question 76: How should a technician handle a situation where they are asked to release a sterilization load before biological indicator results are available?

Always release the load immediately when requested by a surgeon
Follow the facility's policy, which typically allows release with chemical indicator pass for routine loads but requires BI results before releasing implant loads (Correct answer)
Biological indicator results are not important enough to delay load release
Refuse to release any load under any circumstances until BI results are confirmed

Correct answer: Follow the facility's policy, which typically allows release with chemical indicator pass for routine loads but requires BI results before releasing implant loads

Most facilities have policies allowing conditional release of routine loads based on mechanical and chemical indicator results, while implant loads require BI confirmation. The technician must know and follow their facility's specific policy.

Question 77: Which type of regulatory standard is AAMI/ISO 17664 relevant to in sterile processing?

Information to be provided by the medical device manufacturer for the processing of medical devices (Correct answer)
Packaging material strength testing
Environmental air quality in sterile processing departments
Biological indicator performance requirements

Correct answer: Information to be provided by the medical device manufacturer for the processing of medical devices

AAMI/ISO 17664 specifies the information that device manufacturers must provide to enable healthcare workers to safely reprocess medical devices.

Question 78: A new technician in the decontamination area is observed placing heavy orthopedic instruments on top of delicate microsurgical instruments in the washer-disinfector basket. Which principle of decontamination is being violated?

Use of appropriate personal protective equipment (PPE)
Verification of water quality
Following manufacturer's instructions for use (IFU)
Proper loading and arrangement of instruments (Correct answer)

Correct answer: Proper loading and arrangement of instruments

Proper loading of automated washers is critical to ensure all surfaces are exposed to the cleaning process and to prevent damage to the instruments. Placing heavy items on top of delicate ones can cause damage and may prevent the water and detergent from reaching all surfaces of the instruments underneath. While following the IFU is always important, this scenario directly illustrates an error in the physical loading process.

Question 79: A medical device reprocessing technician is manually cleaning a set of stainless steel surgical instruments. Which of the following cleaning agents is most appropriate for breaking down protein-based soils like blood and tissue?

Protease-based enzymatic cleaner (Correct answer)
Saline solution
70% isopropyl alcohol
Glutaraldehyde solution

Correct answer: Protease-based enzymatic cleaner

Protease-based enzymatic cleaners are specifically designed to break down protein-based soils, such as blood and tissue, which are common on surgical instruments. Glutaraldehyde is a high-level disinfectant, alcohol is an antiseptic and disinfectant but not a primary cleaning agent for heavy soil, and saline can damage instruments and does not have cleaning properties.

Question 80: What must be done if the MEC test of a high-level disinfectant solution fails?

Continue using it for one more cycle only
Discard the solution immediately and replace with fresh disinfectant (Correct answer)
Add more water to dilute the solution
Heat the solution to restore its potency

Correct 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.

Question 81: What is a surgical site infection (SSI) and how can reprocessing failures contribute to it?

An infection occurring at or near the surgical incision within 30-90 days of a procedure, potentially caused by microorganisms on improperly reprocessed surgical instruments (Correct answer)
A skin irritation from surgical tape
An infection at the IV insertion site
An infection that only occurs in emergency surgeries

Correct answer: An infection occurring at or near the surgical incision within 30-90 days of a procedure, potentially caused by microorganisms on improperly reprocessed surgical instruments

SSIs are infections at the surgical site that can occur when microorganisms are introduced during the procedure. Inadequately reprocessed surgical instruments can be a direct source of these pathogens.

Question 82: A Medical Device Reprocessing Technician (MDRT) is preparing to manually clean a surgical instrument contaminated with blood and tissue. According to Routine Practices (Standard Precautions), what is the minimum Personal Protective Equipment (PPE) the technician must wear?

Eye protection and a surgical mask.
A pair of gloves only.
A fluid-resistant gown, eye protection, a surgical mask, and utility gloves. (Correct answer)
A fluid-resistant gown and utility gloves.

Correct answer: A fluid-resistant gown, eye protection, a surgical mask, and utility gloves.

Routine Practices require the use of appropriate PPE to protect against splashes and aerosol generation, which are significant risks during manual cleaning. This includes a fluid-resistant gown to protect clothing and skin, eye protection (goggles or face shield) to protect mucous membranes of the eyes, a mask to protect the nose and mouth, and heavy-duty utility gloves to prevent sharps injuries and exposure to contaminated fluids.

Question 83: Ortho-phthalaldehyde (OPA) is a common high-level disinfectant. What is a key characteristic of OPA that reprocessing technicians must be aware of to ensure both safety and quality?

It will stain any residual protein (e.g., blood, tissue) on instruments a gray/blue color. [1, 2] (Correct answer)
It requires mixing with a powdered activator before each use.
It is highly corrosive to stainless steel and must be rinsed off immediately.
It must be heated to above 50°C (122°F) to be effective.

Correct answer: It will stain any residual protein (e.g., blood, tissue) on instruments a gray/blue color. [1, 2]

A primary characteristic of OPA is its ability to stain proteins gray or blue. [1, 4] This serves as a visual indicator that pre-cleaning may have been inadequate. It also means that OPA can stain unprotected skin, necessitating the use of appropriate PPE.

Question 84: What should a reprocessing technician do if an instrument set is missing a component during assembly?

Document the missing item, attempt to locate a replacement, and if unavailable, communicate the shortage to the OR team before the set is needed (Correct answer)
Add a different instrument as a substitute without notifying anyone
Sterilize the incomplete set and hope no one notices
Remove the set from circulation permanently

Correct answer: Document the missing item, attempt to locate a replacement, and if unavailable, communicate the shortage to the OR team before the set is needed

Missing instruments can impact surgical procedures. Documenting the shortage, seeking a replacement, and communicating with the surgical team ensures they can prepare alternatives or adjust their approach before the procedure begins.

Question 85: A technician observes that several wrapped instrument trays emerging from a steam sterilizer cycle are damp. This phenomenon is known as a 'wet pack'. What is the most significant risk associated with a wet pack?

It indicates the sterilizer is using too much water.
It requires a longer cooling time before the instruments can be used.
It can act as a pathway for microorganisms to contaminate the instruments. (Correct answer)
It can cause corrosion on the stainless steel instruments.

Correct answer: It can act as a pathway for microorganisms to contaminate the instruments.

A wet pack is a significant concern because moisture can wick microorganisms from the outside of the package to the inside, compromising the sterility of the contents. While corrosion and longer cooling times are possible issues, the primary and most critical risk is the potential for recontamination, rendering the instruments unsafe for patient use.

Question 86: What biological indicator is used to monitor ethylene oxide sterilization cycles?

Staphylococcus aureus
Bacillus atrophaeus (formerly B. subtilis var. niger) (Correct answer)
Escherichia coli
Geobacillus stearothermophilus

Correct answer: Bacillus atrophaeus (formerly B. subtilis var. niger)

Bacillus atrophaeus spores are used as the biological indicator for ETO sterilization because they are highly resistant to ETO gas. If the sterilization process kills these resistant spores, it confirms that less resistant organisms were also eliminated.

Question 87: According to Canadian Standards Association (CSA) Z314-18, the physical layout of a Medical Device Reprocessing Department (MDRD) is designed to facilitate one-way workflow. What is the primary infection prevention purpose of this design?

To prevent cross-contamination between soiled and clean/sterile items. (Correct answer)
To ensure technicians do not have to walk as far.
To improve the department's aesthetics and organization.
To make it easier for supervisors to monitor staff.

Correct answer: To prevent cross-contamination between soiled and clean/sterile items.

A one-way workflow from the decontamination (soiled) area to the preparation/packaging (clean) area and then to the sterilization/storage (sterile) area is a fundamental principle of MDRD design. This directional flow is crucial to prevent clean and sterile items from coming into contact with or being contaminated by soiled items, thus breaking the chain of infection.

Question 88: What is the chain of infection, and why is it important in medical device reprocessing?

A chain used to secure biohazard containers
A method for storing instruments in sequence
A model describing the six links required for infection transmission: infectious agent, reservoir, portal of exit, mode of transmission, portal of entry, and susceptible host (Correct answer)
A ranking system for infection severity

Correct answer: A model describing the six links required for infection transmission: infectious agent, reservoir, portal of exit, mode of transmission, portal of entry, and susceptible host

The chain of infection describes the six elements needed for disease transmission. Medical device reprocessing breaks this chain by eliminating the infectious agent on devices (reservoir) and preventing contaminated instruments from becoming a mode of transmission.

Question 89: A hospital's MDRD processes many heat-sensitive, complex devices. They are considering a low-temperature sterilization method known for its safety, as its primary byproducts are non-toxic. Which method breaks down into water and oxygen?

Vaporized Hydrogen Peroxide (VHP) (Correct answer)
Formaldehyde
Glutaraldehyde
Ethylene Oxide (EO)

Correct answer: Vaporized Hydrogen Peroxide (VHP)

Vaporized Hydrogen Peroxide (VHP) is considered an environmentally safe sterilization method because the active hydrogen peroxide vapor breaks down into harmless byproducts: water and oxygen. This contrasts with methods like Ethylene Oxide, which leave toxic residues requiring lengthy aeration.

Question 90: What is hydrogen peroxide gas plasma sterilization?

A low-temperature sterilization method that uses hydrogen peroxide vapour converted to a plasma state by radiofrequency energy to sterilize medical devices (Correct answer)
A steam sterilization process with added hydrogen peroxide
A type of ultraviolet light sterilization
Sterilization using liquid hydrogen peroxide

Correct answer: A low-temperature sterilization method that uses hydrogen peroxide vapour converted to a plasma state by radiofrequency energy to sterilize medical devices

Hydrogen peroxide gas plasma (such as STERRAD systems) uses a combination of hydrogen peroxide vapour and low-temperature plasma (ionized gas) to achieve sterilization at temperatures around 45-55°C, suitable for many heat-sensitive devices.

Question 91: What PPE is required for staff working in the decontamination area?

Gloves, gown, face protection (mask and eye shield or face shield), and waterproof footwear (Correct answer)
Surgical scrubs only
Street clothes with a lab coat
Only gloves

Correct answer: Gloves, gown, face protection (mask and eye shield or face shield), and waterproof footwear

Staff in the decontamination area are exposed to potentially infectious materials and chemical cleaning agents. Full PPE including heavy-duty gloves, fluid-resistant gown, face protection, and waterproof footwear is required per CSA and occupational health standards.

Question 92: What is the purpose of a 'one-way workflow' design principle in sterile processing departments related to transport?

To ensure contaminated items always move in a physical direction away from clean and sterile areas, preventing cross-contamination (Correct answer)
To improve inventory management by separating instrument types
To reduce walking distance for sterile processing staff
To comply with building fire codes requiring directional exit signage

Correct answer: To ensure contaminated items always move in a physical direction away from clean and sterile areas, preventing cross-contamination

One-way workflow physically separates the decontamination zone from clean and sterile areas, ensuring contaminated instruments never travel through or near sterile storage, reducing cross-contamination risk.

Question 93: What is the relationship between pressure and temperature in steam sterilization?

In saturated steam, pressure and temperature are directly related — increasing pressure raises the boiling point and thus the steam temperature, which is how sterilization temperatures above 100°C are achieved (Correct answer)
Higher pressure always means lower temperature
Pressure is controlled independently of temperature
They are unrelated variables

Correct answer: In saturated steam, pressure and temperature are directly related — increasing pressure raises the boiling point and thus the steam temperature, which is how sterilization temperatures above 100°C are achieved

Steam sterilization operates in a sealed, pressurized chamber. By increasing the pressure above atmospheric, the boiling point of water increases, producing steam at temperatures well above 100°C — the temperatures needed for rapid sterilization.

Question 94: A device labelled as 'single-use' by the manufacturer is being considered for reprocessing. What is the Canadian regulatory position?

It is completely banned in Canada
Reprocessing of single-use devices is regulated by Health Canada and requires a licensed reprocessor to validate safety and effectiveness (Correct answer)
Individual hospitals can decide without regulatory oversight
Single-use devices can always be reprocessed if cleaned thoroughly

Correct answer: Reprocessing of single-use devices is regulated by Health Canada and requires a licensed reprocessor to validate safety and effectiveness

In Canada, reprocessing of single-use devices (SUDs) is permitted only through licensed third-party reprocessors who must demonstrate that the reprocessed device meets the same safety and performance standards as the original. Individual facilities cannot reprocess SUDs independently.

Question 95: What are healthcare-associated infections (HAIs) and how does reprocessing help prevent them?

Infections acquired during or as a result of healthcare delivery that were not present at the time of admission (Correct answer)
Infections that only affect healthcare workers
Infections that patients had before admission
Infections caused by allergic reactions to medications

Correct answer: Infections acquired during or as a result of healthcare delivery that were not present at the time of admission

HAIs are infections that patients acquire during their healthcare experience. Improperly reprocessed medical devices are a recognized source of HAIs, making effective reprocessing a critical infection prevention strategy.

Question 96: An MDRT is working in the decontamination area and their gloved hand is accidentally punctured by a sharp instrument. What is the most appropriate immediate action to take?

Immediately remove the gloves, wash the area with soap and water, and report the injury. (Correct answer)
Apply a new pair of gloves over the punctured one and continue working.
Squeeze the wound to encourage bleeding and then cover it with a bandage.
Finish cleaning the current set of instruments before seeking help.

Correct answer: Immediately remove the gloves, wash the area with soap and water, and report the injury.

In case of a sharps injury, the immediate priority is to decontaminate the wound by washing it thoroughly with soap and water. The incident must then be reported immediately to a supervisor according to the facility's occupational health and safety policy for post-exposure follow-up. Continuing to work or simply covering the wound is unsafe.

Question 97: What is antimicrobial resistance (AMR) and how does it impact medical device reprocessing?

AMR makes instruments more durable
AMR means instruments are resistant to cleaning
AMR only affects medication choices, not reprocessing
AMR refers to microorganisms that have evolved to survive antimicrobial treatments, making thorough reprocessing even more critical to prevent transmission of these resistant organisms (Correct answer)

Correct answer: AMR refers to microorganisms that have evolved to survive antimicrobial treatments, making thorough reprocessing even more critical to prevent transmission of these resistant organisms

Antimicrobial-resistant organisms (such as MRSA, VRE, and CRE) are harder to treat with standard antibiotics, making prevention of transmission through properly reprocessed devices even more important for patient safety.

Question 98: What is the role of a washer-disinfector in the decontamination process?

It replaces the need for sterilization entirely
It only stores instruments
It is used exclusively for sharpening instruments
It provides automated cleaning and thermal disinfection in a single cycle (Correct answer)

Correct answer: It provides automated cleaning and thermal disinfection in a single cycle

A washer-disinfector automates the cleaning process and includes a thermal disinfection phase, typically using heated rinse water at a specified temperature and exposure time. This standardizes cleaning and reduces staff exposure to contaminated items.

Question 99: How should a technician manage their time and prioritize tasks during a busy shift?

Process whatever is nearest without any prioritization
Prioritize based on clinical urgency (emergency cases first), scheduled surgery requirements, and quality standards — never sacrificing quality for speed (Correct answer)
Always process the fastest items first regardless of clinical need
Prioritization is not necessary if you work fast enough

Correct answer: Prioritize based on clinical urgency (emergency cases first), scheduled surgery requirements, and quality standards — never sacrificing quality for speed

Effective time management in reprocessing balances clinical urgency with quality standards. Emergency and time-sensitive cases take priority, but quality steps must never be shortened regardless of workload pressure.

Question 100: What is the difference between decontamination and disinfection in infection prevention terminology?

Decontamination is the broad process of making items safe to handle by reducing microbial contamination, while disinfection is a specific step that destroys most pathogenic microorganisms using chemical or physical methods (Correct answer)
They are exactly the same process
Disinfection always comes before decontamination
Decontamination only refers to removing visible dirt

Correct answer: Decontamination is the broad process of making items safe to handle by reducing microbial contamination, while disinfection is a specific step that destroys most pathogenic microorganisms using chemical or physical methods

Decontamination is the overarching process that includes all steps to reduce contamination to a safe level (cleaning, disinfecting, sterilizing). Disinfection is one specific step within this process that targets microbial reduction through defined chemical or thermal methods.

Certified Medical Device Reprocessing Technician (CMDRT)

The CMDRT exam, administered by CSA Group, certifies technicians in the safe and effective reprocessing of reusable medical devices in healthcare facilities.

Questions

180 min

Time Limit

70%

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