CER Exam Flashcards

Q: Do I need the CRCST credential to take the HSPA CER exam?

No. CER is a standalone certification. You need 3+ months of hands-on endoscope reprocessing experience within the past 3 years, verified by a supervisor, but no other credentials such as CRCST are required to sit for the exam.

Q: How many questions are on the HSPA CER exam and how many are scored?

The CER exam has 150 questions with a 3-hour time limit. Of these, 125 are scored and 25 are unscored pretest items randomly distributed throughout the exam. The exam fee is $140 and it is administered year-round at Prometric.

Q: What topics carry the most weight on the CER exam?

Endoscope Reprocessing Steps is the heaviest domain at 32%, followed by Handling, Transport, and Storage (16%), Microbiology and Infection Control (12%), Work Area Design (12%), Endoscope Design (10%), Tracking and Maintenance (10%), and Human Factors (8%).

Q: What standard should I study for flexible endoscope reprocessing?

ANSI/AAMI ST91 is the comprehensive standard for processing flexible and semi-rigid endoscopes in healthcare facilities. It covers precleaning, transport, cleaning, high-level disinfection, sterilization, drying, storage, and quality management, and is a primary CER exam reference.

Q: Why is manual cleaning considered the most important reprocessing step?

If organic debris is not physically removed during manual cleaning, residual soil shields microorganisms from high-level disinfection, making it ineffective. The principle 'if you can't clean it, you can't disinfect it' is fundamental: cleaning failures are the most common root cause of positive endoscope cultures.

Question 1

Insertion Tube

Accepted Answer

The long, flexible section of the endoscope introduced into the patient. It contains the internal channels, light guide fibers, image components, and the angulation wires that deflect the tip. Handle carefully during reprocessing to avoid damage.

Question 2

Biopsy / Instrument Channel

Accepted Answer

The working channel that passes accessories such as forceps, snares, and cytology brushes. It is typically the largest internal channel and requires thorough brushing because of heavy tissue and blood exposure.

Question 3

Air/Water Channel

Accepted Answer

Delivers air to insufflate the body cavity and directs water across the distal lens to keep it clear. Smaller in diameter than the biopsy channel, it needs specific cleaning adapters for thorough flushing.

Question 4

Suction Channel

Accepted Answer

Aspirates blood, fluids, secretions, and debris from the procedural field. Heavily contaminated and often shares part of its pathway with the biopsy/instrument channel, so it requires meticulous cleaning.

Question 5

Elevator Mechanism (Duodenoscope)

Accepted Answer

A movable wire and recess on ERCP duodenoscopes with narrow crevices that are extremely hard to clean. Linked to transmission of multidrug-resistant organisms such as CRE; multiple FDA safety communications target it.

Question 6

Video Chip (CCD/CMOS)

Accepted Answer

A sensor at the distal tip that converts light into electronic signals sent through insertion-tube wires to the video processor. Provides superior image quality compared with older fiberoptic systems.

Question 7

Colonoscope vs Gastroscope vs Bronchoscope

Accepted Answer

A colonoscope (longer, larger biopsy channel) examines the colon; a gastroscope examines the upper GI tract; a bronchoscope examines the airways. Different channel configurations require model-specific cleaning adapters.

Question 8

Point-of-Use Precleaning

Accepted Answer

The FIRST reprocessing step, performed immediately after the procedure: wipe the insertion tube with a lint-free cloth moistened with enzymatic solution and flush channels per IFU. Prevents soil from drying on or inside the scope.

Question 9

Soiled Endoscope Transport

Accepted Answer

Move soiled scopes in a closed, leak-proof container labeled biohazardous, large enough to avoid tight coiling. Open transport or delays let soil dry and increase infection risk.

Question 10

Purpose of Leak Testing

Accepted Answer

Detects holes, cracks, or breaches in the outer sheath or channels that could let fluid reach internal components during immersion. Performed after transport to the reprocessing area but before manual cleaning.

Question 11

Positive Leak Test Indicator

Accepted Answer

A steady stream of bubbles from one specific point on the pressurized, submerged scope signals a breach. A stable pressure reading with no bubbles indicates a passed test.

Question 12

Failed Leak Test Response

Accepted Answer

Do NOT immerse the scope. Carefully wipe the exterior per guidance, tag it as damaged, document the failure, and send it for repair. It must not be used on patients until professionally repaired and verified.

Question 13

Why Immersing a Leaking Scope Is Harmful

Accepted Answer

Fluid enters through the breach and reaches internal optics, wiring, and angulation components, causing costly damage and compromising patient safety. Immersion is prohibited once a leak is confirmed.

Question 14

Channel Patency Check

Accepted Answer

Confirms every channel is open and unobstructed by observing fluid or air flow. A blocked channel cannot be cleaned or disinfected, so any obstruction must be resolved before reprocessing continues.

Question 15

Enzymatic Detergent

Accepted Answer

Contains protease, lipase, and amylase enzymes that break down blood, tissue, and mucus on surfaces and within channels. Critical because organic debris shields microorganisms from disinfection.

Question 16

Enzymatic Detergent Water Temperature

Accepted Answer

Use tepid water within the detergent IFU range (commonly 25-45°C / 77-113°F). Water too cold reduces enzyme activity; water too hot denatures enzymes and coagulates protein soil.

Question 17

Detergent Dilution Accuracy

Accepted Answer

Follow the IFU dilution ratio exactly. Too dilute gives insufficient enzyme activity and inadequate cleaning; too concentrated wastes product, leaves interfering residue, and may damage scope materials.

Question 18

Correct Cleaning Brush Selection

Accepted Answer

Use the brush size and type specified by the scope IFU for each channel. Too small fails to contact channel walls; too large damages the lining. Inspect and replace worn brushes regularly.

Question 19

Brushing Endpoint

Accepted Answer

Pass the correct brush through each brushable channel repeatedly, cleaning debris off the brush between passes, until it emerges visually clean and free of tissue, blood, or debris.

Question 20

Brush Inspection Before Use

Accepted Answer

Check brushes for bent, broken, or missing bristles. Worn bristles fail to clean channel walls and can scratch the lining, creating surfaces where biofilm establishes. Discard and replace damaged brushes.

Question 21

Removing Valves Before Cleaning

Accepted Answer

Detachable valves and their ports trap organic debris and microorganisms beneath them. Remove and clean valves and ports separately with brushes; failure to do so is a recognized reprocessing deficiency.

Question 22

Rinse Between Cleaning and HLD

Accepted Answer

Removes residual enzymatic detergent, loose debris, and organic matter. Leftover detergent can dilute or chemically inactivate the high-level disinfectant, reducing its efficacy.

Question 23

Spaulding Classification: Semi-Critical

Accepted Answer

Devices that contact mucous membranes or non-intact skin. Flexible endoscopes are semi-critical and require a minimum of high-level disinfection between patient uses.

Question 24

Spaulding Classification: Critical vs Non-Critical

Accepted Answer

Critical devices enter sterile tissue or the vascular system and require sterilization; non-critical devices contact only intact skin and need low-level disinfection. The class sets the minimum reprocessing level.

Question 25

High-Level Disinfection (HLD)

Accepted Answer

Kills all microorganisms — vegetative bacteria, mycobacteria, fungi, viruses — EXCEPT high numbers of bacterial spores. It is the minimum standard for semi-critical flexible endoscopes.

Question 26

Minimum Effective Concentration (MEC)

Accepted Answer

Active disinfectant concentration drops with use as rinse water dilutes it and organic load consumes it. Test MEC before each use; if below the minimum, discard and replace the solution — do not top off.

Question 27

Required HLD Contact Time

Accepted Answer

Determined by the FDA-cleared labeling of the specific germicide at its validated temperature and concentration. Shorter time, lower temperature, or lower concentration invalidates disinfection.

Question 28

Glutaraldehyde

Accepted Answer

An alkaline-activated HLD agent that must be activated before use, has a defined use life (commonly 14-28 days), and requires MEC testing. Strong odor; needs ventilation and full PPE due to sensitization risk.

Question 29

OPA (Ortho-Phthalaldehyde) Hazard

Accepted Answer

Stains skin, mucous membranes, and clothing on contact. Repeated exposure has caused occupational sensitization and anaphylactic reactions in workers and previously exposed patients. Requires PPE and ventilation.

Question 30

Peracetic Acid (PAA)

Accepted Answer

A low-temperature oxidizing sterilant effective against all microorganisms including spores. Decomposes into non-toxic acetic acid, water, and oxygen, but is corrosive and requires compatible materials.

Question 31

When a Scope Needs Sterilization

Accepted Answer

When it enters normally sterile tissue (e.g., transgastric or transcolonic NOTES procedures) it becomes a critical device. HLD is insufficient; use low-temperature sterilization such as EtO gas or a validated liquid chemical sterilant.

Question 32

Why Flexible Scopes Cannot Be Steam Sterilized

Accepted Answer

Steam and dry heat destroy the polymeric materials and adhesives of flexible endoscopes. Sterilization, when required, must use low-temperature methods such as ethylene oxide or validated liquid chemical sterilant systems.

Question 33

Why Drying Is Critical

Accepted Answer

Residual moisture in channels lets waterborne organisms — especially Pseudomonas aeruginosa — grow and form biofilm, leading to patient infections. Thorough drying preserves the reprocessed state.

Question 34

Alcohol Flush in Drying

Accepted Answer

Flushing 70% isopropyl alcohol through all channels after the final rinse displaces water and evaporates quickly, speeding channel drying. It is followed by forced air to purge the alcohol and moisture.

Question 35

Forced-Air Purge

Accepted Answer

Filtered, pressurized medical-grade air passed through all channels after the alcohol flush removes residual alcohol and moisture so channels are thoroughly dry before storage.

Question 36

Vertical Storage With Open Ports

Accepted Answer

Store scopes hung vertically with valves open and channel caps removed so residual moisture drains and air circulates. Prevents pooling and microbial growth in channels.

Question 37

Horizontal Storage With Caps On (Problem)

Accepted Answer

Moisture pools in channels by gravity and capped ports block air circulation, creating a humid environment where Pseudomonas can proliferate. Avoid this storage configuration.

Question 38

Hang Time

Accepted Answer

The maximum allowable storage duration between reprocessing completion and next patient use. If exceeded, the scope must be fully reprocessed before use. Facilities set hang time per storage conditions and ST91 guidance.

Question 39

HEPA Filtration in Storage Cabinets

Accepted Answer

HEPA filters capture 99.97% of particles ≥0.3 microns, including airborne bacteria and fungal spores, so circulating cabinet air does not recontaminate scopes stored with ports open for drying.

Question 40

ANSI/AAMI ST91

Accepted Answer

The comprehensive standard for processing flexible and semi-rigid endoscopes, covering precleaning, transport, cleaning, HLD, sterilization, drying, storage, and quality management. A primary CER exam reference.

Question 41

Reprocessing Cycle Documentation

Accepted Answer

Record scope identifier, patient/procedure info, technician, AER unit, disinfectant lot, cycle parameters, and MEC results. Enables full traceability for quality assurance and outbreak investigation.

Question 42

Endoscope Tracking System

Accepted Answer

Links each scope by serial number to the patient, procedure, technician, AER, and cycle parameters. If a reprocessing failure is found, it enables rapid identification of all potentially affected patients.

Question 43

Borescope Inspection

Accepted Answer

A miniature camera inserted into channels to visually inspect for residual soil, scratches, corrosion, or biofilm. Provides quality assurance beyond standard verification for audits and investigations.

Question 44

ATP Bioluminescence Testing

Accepted Answer

Detects adenosine triphosphate from organic matter on surfaces; a swab is read in a luminometer in relative light units. Results above threshold indicate inadequate cleaning, supplementing visual inspection.

Question 45

IFU Compliance

Accepted Answer

Strict adherence to the written manufacturer instructions for each scope model, AER, and chemistry. IFUs are the validated procedure; deviating means reprocessing was not performed as validated and efficacy is unverified.

Question 46

Biofilm

Accepted Answer

A community of microorganisms in a protective extracellular matrix, up to about 1,000 times more resistant to disinfectants than free-floating bacteria. Thorough mechanical brushing is essential to disrupt and remove it.

Question 47

Pseudomonas aeruginosa

Accepted Answer

A gram-negative pathogen frequently linked to endoscope outbreaks. It thrives in moist environments, readily forms biofilm in channels, and can colonize rinse-water systems — making drying and water quality critical.

Question 48

Bacterial Spores and HLD Limitation

Accepted Answer

Spores (e.g., Clostridioides difficile) are the most resistant microbial form. HLD kills vegetative bacteria, mycobacteria, fungi, and viruses but not high numbers of spores — only sterilization guarantees spore elimination.

Question 49

Decontamination Area PPE

Accepted Answer

Requires a fluid-resistant gown, chemical-resistant utility gloves, face protection (face shield or goggles plus mask), and a hair cover to protect against bioaerosols and chemical splashes.

Question 50

Dirty-to-Clean Workflow

Accepted Answer

Reprocessing areas must use a unidirectional dirty-to-clean layout with physical separation and negative air pressure in decontamination, preventing aerosols and soiled items from recontaminating reprocessed scopes.

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