FREE HSPA CER Exam Guide 2026: Pass Endoscope Reprocessor

HSPA CER Exam Guide 2026: How to Pass the Certified Endoscope Reprocessor on Your First Try

The Certified Endoscope Reprocessor (CER) is HSPA's specialty credential for sterile processing professionals and endoscopy technicians who reprocess flexible endoscopes — the most infection-risk-heavy device category in modern healthcare. The 2024 IAHCSMM-to-HSPA rebrand is complete, the ANSI/AAMI ST91:2021 standard now governs the field, and 2026 is the first full year that the CDC, CMS, and Joint Commission surveyors are citing ST91 directly when auditing endoscopy departments.

This guide is built to beat every competitor article on the web. You will get the real 2026 HSPA CER numbers pulled from the January 2026 HSPA CER application, the seven-domain content outline with exact percentage weights (Endoscope Reprocessing Steps is 32% — nearly one-third of the exam), the ANSI/AAMI ST91:2021 requirements that show up on almost every sitting, the leak-testing and drying-time traps that push first-time candidates into retakes, a realistic 4–6 week focused study plan, CER vs CRCST vs CIS comparison, annual recertification rules (6 CE/year, $50/year — same renewal cadence as every other HSPA credential), and the 2026 career and salary outlook for endoscopy reprocessing technicians.

HSPA CER Exam At a Glance (2026)

The CER is HSPA's newest specialty credential and the one infection preventionists, Joint Commission surveyors, and hospital risk managers are watching most closely. Every high-profile CRE and Pseudomonas outbreak traced to a duodenoscope or bronchoscope in the last decade has tightened scrutiny on the people who reprocess these devices — which is why HSPA built the CER in the first place.

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What Is the HSPA CER? And Why It Exists

Flexible endoscopes — colonoscopes, gastroscopes, duodenoscopes, bronchoscopes, ureteroscopes, cystoscopes — are the hardest medical devices to clean in the entire hospital. They have long, narrow, opaque internal channels; heat-sensitive electronics and optics that rule out steam sterilization; complex elevators (duodenoscopes) and valves that trap bioburden; and a semi-critical Spaulding classification that requires at minimum high-level disinfection (HLD) between every patient.

Multiple CDC and FDA investigations from 2013 onward linked duodenoscope reprocessing failures to fatal outbreaks of carbapenem-resistant Enterobacteriaceae (CRE). The root cause, nearly every time, was a human factor: skipped leak test, inadequate channel brushing, hang time exceeded, or IFU steps shortcut under OR turnover pressure. Regulatory agencies responded by strengthening ST91 (published 2015, rewritten 2021) and endorsing specialty credentialing.

HSPA introduced the CER to certify the specific competencies needed to reprocess flexible endoscopes to ST91 standards. Unlike the CRCST (which covers all central service), the CER is narrow and deep — you will be tested on channel brushing stroke technique, MEC (minimum effective concentration) testing, AER cycle interpretation, and hang-time rules that a CRCST holder might never have touched.

HSPA (Formerly IAHCSMM) Rebrand — What Changed

In early 2024 IAHCSMM (International Association of Healthcare Central Service Materiel Management) rebranded to HSPA (Healthcare Sterile Processing Association). The CER credential name, 3-month experience eligibility rule, 150-question format, annual recertification cycle, and ANAB/NCCA accreditation all remained identical. Only the parent body's name, website (now myhspa.org), and branding on study materials changed.

Older YouTube videos and forum posts will still say "IAHCSMM CER" or "IAHCSMM Endoscope Certification" — those are not outdated content, only outdated branding. If you find an ST91-aligned resource from 2022–2023 under the IAHCSMM name, it is still valid for the 2026 exam.

Who Should Take the CER Exam

• Endoscopy department technicians who reprocess scopes between cases in the GI suite, bronchoscopy lab, or urology procedure room
• Sterile Processing Department (SPD) techs whose hospital has centralized endoscope reprocessing into SPD (a growing trend post-2021 ST91)
• CRCST-credentialed techs adding a specialty to increase pay and differentiate their resume
• OR scrub techs and GI nurses who want a formal credential for the reprocessing work they already do
• Infection preventionists and SPD educators who need the CER to audit and train others credibly
• New endoscopy hires whose hospital requires certification within 12–18 months (increasingly common in 2026)

If your job title includes Endoscope Technician, GI Technician, Endoscopy Reprocessing Tech, Bronchoscopy Tech, Scope Tech, Decon Tech, or Sterile Processing Tech with a scope-heavy caseload — the CER is the specialty credential that pays for itself in a single annual raise cycle.

Eligibility: The 3-Month Endoscope-Specific Experience Rule

This is the most misunderstood part of CER eligibility, and it is where most candidates get their application rejected.

The 3-Month Requirement

HSPA requires a minimum of 3 months of hands-on endoscope reprocessing experience on a paid or volunteer basis, and the experience must have been accumulated within the past 3 years. The HSPA CER application (Revised January 2026) states this verbatim in the Section 4 supervisor attestation: "minimum 3 months of hands-on experience required for the Certified Endoscope Reprocessor (CER) certification." Key rules:

• Experience must be endoscope-specific — general CRCST decontamination or instrument prep does NOT count. Three months of regular reprocessing work at 40 hours a week works out to roughly 400 hours; HSPA itself does not set a specific hour floor for CER, only the 3-month minimum.
• Qualifying work includes bedside/point-of-use care, leak testing, manual cleaning, HLD/AER operation, rinsing, drying, storage/hang-time monitoring, and tracking/IFU verification — all the steps listed on the application: pre-cleaning, testing, decontaminating, inspecting, disinfecting and/or sterilizing, transporting, and storing endoscopes.
• Experience can be paid or volunteer — new-hire training time counts if documented.
• The supervisor verification must be signed by someone above your rank (SPD coordinator, lead, manager, endoscopy nurse manager, or hospital educator). Peer techs cannot sign. If you completed your experience across more than one facility, each facility's supervisor must complete a separate verification page.
• The supervisor's work contact information only (no personal email or phone) is accepted on the application.

What Does NOT Count

• Rigid scope reprocessing only (laparoscopes, arthroscopes, cystoscopes that are autoclaved) — these fall under CRCST scope, not CER
• CRCST-general decontamination hours on instrument trays
• Vendor-led product demo or in-service hours without direct hands-on processing
• Classroom or online course hours (a common mistake — those are CE, not experience)

No Provisional Pathway for CER

Unlike the CRCST (which offers a 6-month provisional window to accumulate its 400 hours after passing the exam), the CER does not offer a provisional pathway. You must have the full 3 months of experience documented and signed off before applying. The application is rejected without it. Plan your work schedule accordingly — most candidates accumulate the time in 3–4 months of dedicated endoscopy reprocessing rotation.

CER Content Outline and Domain Weights (2026)

The HSPA CER blueprint is weighted heavily toward the reprocessing workflow itself — nearly one-third of the exam is on the physical steps of turning a used scope into a patient-ready one. Below is the official HSPA CER content outline in its published order (seven domains), with percentage weights and approximate scored-question counts (of the 125 scored items):

Domain 1 — Endoscope Reprocessing Steps (32%)

This is the money domain. Master the full sequence in order and know the why behind each step:

1. Point-of-use (bedside) pre-cleaning — immediately after the procedure, wipe the insertion tube and flush channels with enzymatic solution to prevent bioburden drying. ST91 emphasizes this step because dried bioburden forms biofilm that high-level disinfection cannot penetrate.
2. Transport to decontamination — in a closed, leak-proof, labeled container marked "biohazard." Never carry an uncovered contaminated scope through a corridor.
3. Leak testing — performed on every scope before manual cleaning. A failed leak test means the scope cannot be reprocessed and must be removed from service for repair. Leak testing is done both dry (pressurized) and wet (submerged and articulated) per ST91.
4. Manual cleaning — brush every channel with the correct-sized, single-use brush, using enzymatic detergent at manufacturer-specified concentration and water temperature (typically below 110°F / 43°C — hot water coagulates protein).
5. Rinse — thorough rinse with utility or critical water per IFU.
6. High-level disinfection (HLD) or sterilization — in an AER (automated endoscope reprocessor) using an FDA-cleared liquid chemical sterilant (OPA, peracetic acid, hydrogen peroxide). MEC (minimum effective concentration) of the solution must be tested before each cycle with test strips.
7. Post-HLD rinse — critical or sterile water, channels flushed.
8. Drying — alcohol flush (70% isopropyl) followed by forced filtered air through all channels. ST91 emphasizes drying because residual moisture is the single biggest driver of biofilm and Pseudomonas growth in storage.
9. Storage — in an approved drying/storage cabinet, hung vertically, channels uncapped, for the hang time specified by the facility's ST91-compliant policy.
10. Tracking and documentation — scope serial, patient, tech, cycle data, AER cycle printout, MEC result — all logged for traceability.

Domain 2 — Handling, Transport and Storage (16%)

• Transport contaminated scopes in closed containers labeled "biohazard"
• Clean scopes transport in clean, closed containers (never reuse soiled containers)
• Storage in HEPA-filtered, positive-pressure drying cabinets per ST91
• Hang time — ST91:2021 does not set a universal expiration but requires facilities to validate their own hang time based on drying efficacy. Most facilities land on 7 days in validated drying cabinets; 24–72 hours in non-drying cabinets. Memorize the concept: hang time is facility-validated, not universal.
• Vertical hanging only, channels uncapped, insertion tube straight

Domain 3 — Microbiology and Infection Control (12%)

• Biofilm formation and why it defeats HLD
• Spaulding classification — flexible endoscopes are semi-critical (mucous membrane contact), requiring minimum HLD; duodenoscope elevators and bronchoscopes are increasingly processed by sterilization
• Transmission routes (contact, droplet, airborne)
• Standard precautions + transmission-based precautions
• PPE for decontamination — fluid-resistant gown, mask with face shield, double gloves (inner nitrile, outer heavy-duty), shoe covers, hair cover
• Common endoscope-associated pathogens: CRE (duodenoscopes), Pseudomonas aeruginosa (bronchoscopes), Mycobacterium chimaera, HCV

Domain 4 — Work Area Design (12%)

• Unidirectional workflow — dirty to clean, never back
• Physical separation of decontamination and clean/prep areas (either separate rooms per ST91 or a barrier with negative-to-positive pressure flow)
• Air pressure — decontamination is negative pressure, clean/storage is positive pressure
• Air changes — 10 ACH (decontamination), 10 ACH (clean), minimum
• Temperature and humidity — 60–73°F, 30–60% RH typical
• Water quality — utility water for initial rinse, critical (treated) water for final rinse; ST91 references AAMI TIR34 for water quality

Domain 5 — Endoscope Design and Structure (10%)

• Flexible endoscope anatomy: control section, insertion tube, distal tip (bending section, objective lens, light guide, instrument channel opening, air/water channel), light guide connector, umbilical
• Channels: working/instrument channel, air/water channel, suction channel, auxiliary water channel, elevator wire channel (duodenoscopes)
• Know the difference between a gastroscope, colonoscope, duodenoscope, bronchoscope, ureteroscope, and EBUS scope — and why duodenoscope elevators are the highest-risk component

Domain 6 — Tracking, Repair and Maintenance (10%)

• Scope-level traceability — serial number, patient, tech, cycle, MEC result, AER printout
• IFU compliance — every scope has a unique IFU; storing IFUs in the reprocessing area is ST91-required
• Recalls — FDA MAUDE reporting; pulling a recalled scope from service
• Preventive maintenance — vendor PM intervals, visual inspection with lighted magnification per ST91 (new emphasis vs older ST91:2015)

Domain 7 — Human Factors (8%)

• Staffing ratios for safe reprocessing
• Annual competency assessment (ST91 requires documented annual competency for every reprocessing tech)
• Fatigue, distraction, production pressure — the "why" behind most outbreak root-cause analyses
• Communication with endoscopy/OR on scope readiness
• Error prevention techniques (checklists, two-person verification for high-risk steps)

ANSI/AAMI ST91:2021 — The Standard You Must Know

ST91:2021 ("Flexible and semi-rigid endoscope processing in health care facilities") is the primary reference for the CER exam. Every domain above derives from ST91. Key 2021 updates that appear on the exam:

• Visual inspection with lighted magnification is now required on every scope after manual cleaning
• Cleaning verification testing (ATP bioluminescence, protein residue tests, or borescope inspection) is strongly recommended and required in high-risk categories
• Drying got its own expanded section — forced filtered air through all channels for at least 10 minutes after alcohol flush is typical; facilities must validate their drying protocol
• Duodenoscope-specific guidance — elevators and elevator channels require enhanced cleaning; sterilization is preferred where possible
• Annual competency is now explicit — not just initial training
• Water quality — ST91 defers to AAMI TIR34 and requires the facility to classify water as utility vs critical and meet microbial and endotoxin limits on critical water

You do not need to memorize every paragraph of ST91, but you should understand: (1) the reprocessing sequence, (2) visual inspection + cleaning verification expectations, (3) drying requirements, (4) storage/hang-time framework, and (5) annual competency.

Automated Endoscope Reprocessors (AERs)

AERs automate the HLD/rinse/alcohol-flush steps in a closed system. Every CER candidate must understand how AERs work and the common traps:

• Connector kits must match the scope model exactly — wrong connectors mean channels don't get HLD contact
• MEC testing of the liquid chemical sterilant must be done per cycle (some facilities: daily; ST91 says "before first use of a solution" at a minimum, but manufacturer IFUs typically require per-cycle)
• Cycle printout or digital log must be reviewed and signed before releasing the scope
• Failed cycle = scope is not reprocessed; investigate root cause and rerun
• AER preventive maintenance on manufacturer schedule; documented
• Common AER brands (for context, not memorization): Medivators/Cantel ADVANTAGE PLUS, Olympus OER-Pro, Steris Reliance EPS — each with model-specific IFUs

A common CER exam trap: a cycle completed successfully, but MEC test failed. The correct action is do not release the scope — reprocess in a new cycle with verified MEC.

Study Resources (2026)

Primary References (Required)

1. HSPA Endoscope Reprocessor Training Manual / CER Review — the official HSPA study text. Purchase through myhspa.org. This is your main study resource; the exam is written from this content.
2. ANSI/AAMI ST91:2021 — Flexible and semi-rigid endoscope processing in health care facilities. Available from the AAMI store. Read cover-to-cover at least once.
3. SGNA Standards of Infection Prevention in Reprocessing Flexible Endoscopes (Society of Gastroenterology Nurses and Associates) — free on sgna.org. Consistent with ST91 and frequently referenced.

Supplementary (Recommended)

1. Central Service Technical Manual, 9th edition (HSPA, the "purple book") — only the endoscope chapter is directly relevant, but the infection control and Spaulding chapters reinforce CER content
2. CDC Guideline for Disinfection and Sterilization in Healthcare Facilities (Rutala/Weber) — the free CDC PDF covers Spaulding, HLD chemistries, and evidence behind the standards
3. FDA guidance on duodenoscope reprocessing — post-2015 FDA alerts shaped much of modern ST91
4. Free OpenExamPrep practice questions — drill the 7 domains in exam format: Start FREE HSPA CER practice questions

Courses to Skip

Avoid generic "endoscope cleaning" YouTube videos from vendors — they teach their specific AER model, not ST91 principles. Use the HSPA CER Review + ST91 as your spine and use vendor content only to visualize equipment.

4–6 Week Focused Study Plan

Most candidates who have completed the 3-month experience requirement need 4–6 weeks of focused study — much shorter than CRCST because CER is narrower and your daily work already reinforces the content.

Week 1 — Foundation

• Read HSPA CER Review chapters 1–3 (intro, endoscope design, microbiology)
• Watch an ST91 overview webinar on myhspa.org or SGNA
• Drill 30 practice questions on Domains 3 and 5 (Microbiology, Endoscope Design)

Week 2 — Reprocessing Workflow (the 32% domain)

• Read HSPA CER Review chapters on reprocessing sequence
• Read ST91:2021 sections on cleaning, visual inspection, HLD, drying end-to-end
• At work, consciously walk through the sequence and mentally annotate each step with its ST91 source
• Drill 60 practice questions on Domain 1

Week 3 — Storage, Transport, AERs

• ST91 sections on storage, drying cabinets, transport
• AER manufacturer IFU for your facility's AER — note MEC testing requirements
• Drill 40 questions on Domains 2 and 4

Week 4 — Work Area, Tracking, Human Factors

• ST91 sections on facility design, water quality
• SGNA reprocessing standards (free PDF)
• Drill 40 questions on Domains 4, 6, 7

Week 5 — Full-length Practice

• Take two full-length 150-question timed practice exams
• Review every wrong answer and note the ST91 or HSPA reference
• Revisit weak domains

Week 6 — Polish (optional)

• Skim the HSPA CER Review one more time
• Re-read ST91 sections on drying and cleaning verification
• Take a final timed practice exam the week before your scheduled date

Crash plan (2 weeks): For techs with deep endoscope experience who need to test fast — do Weeks 2 and 5 only (reprocessing workflow + two full practice exams), plus skim ST91 drying and visual inspection sections.

Common Pitfalls (What Fails First-Timers)

Based on published HSPA guidance and reprocessing root-cause analyses, here are the traps that catch first-time CER candidates:

1. Treating leak testing as optional — ST91 and IFUs require it on every cycle. The exam will test this repeatedly.
2. Hot-water enzymatic cleaning — below 110°F (43°C) per most IFUs. Hot water coagulates protein onto the scope. High-frequency trap question.
3. Skipping MEC testing — liquid chemical sterilants degrade with use and dilution; MEC must be verified per IFU. A cycle with failed MEC = scope not released, even if the cycle "completed."
4. Universal hang time assumption — ST91:2021 does not set a universal expiration. Hang time is facility-validated based on drying protocol. Exam answers that say "scopes expire after 72 hours, period" are usually wrong.
5. Not knowing the difference between utility and critical water — rinse water at different stages has different quality requirements.
6. Confusing sterilization with HLD — flexible scopes are typically HLD; duodenoscope reprocessing is evolving toward sterilization. Know which step uses which.
7. Wrong brush size — brushes are channel-specific and single-use. A bronchoscope channel brush is not interchangeable with a colonoscope channel brush.
8. Forgetting drying — the 2021 ST91 revision puts drying front and center. Alcohol flush + forced filtered air through every channel. This is the single biggest infection-prevention step.
9. Assuming AER "completed" = scope released — cycle completion, MEC, connector verification, and visual inspection are all separate checks.
10. Treating human factors as soft content — Domain 7 is only 8% but it shows up in scenario questions across all other domains (fatigue + distraction + turnover pressure = skipped steps).

Test-Day Tips

• Arrive 30 minutes early — Prometric requires check-in, ID verification, pocket empty, biometric scan. Missing your slot by more than 15 minutes can forfeit the exam.
• ID requirement — government-issued photo ID with signature. Name on ID must match your HSPA application exactly.
• No personal items in the testing room — no phone, smartwatch, food, water bottle, notes
• Optional 15-minute tutorial before the clock starts — use it to calibrate the screen and review the review/flag feature
• 180 minutes for 150 questions ≈ 72 seconds per question. Flag uncertain questions and come back; don't burn 3 minutes on any single item
• Answer every question — 25 are unscored pretest and you cannot identify them. Guess intelligently using domain context
• Eliminate extremes — answers with "always," "never," "universally" are usually wrong in reprocessing because ST91 is facility-validation-based
• Watch for IFU language — "per manufacturer IFU" is often the right answer over any specific time/temperature unless the question gives you a specific scope and cycle
• Review flagged questions if time permits — but don't second-guess answers you were confident on; data shows changed answers are net-negative on standardized exams
• Pass/fail result — CER reports pass or fail with a weak-domain breakdown if you fail. There is no numeric score.

Recertification — Annual, Not Every 5 Years

All HSPA certifications — including CER — are valid for one year and must be renewed annually. Per the HSPA Certification Handbook (revised January 2026) and the HSPA renewal page, CER recertification requires:

• 6 endoscope-specific CE credits per year (CRCST requires 12/year — CER is half because it is a narrower specialty)
• $50 per year renewal fee (certification only) or $60 for certification plus HSPA membership (one combined fee covers all HSPA certifications held)
• CE must be technical in nature and focused on endoscopes — general SPD CE does not count toward CER renewal
• CE sources: HSPA endoscope lesson plans (2 CE each, published in PROCESS magazine), HSPA webinars (1 CE each), HSPA Process This! podcast (0.5 CE per episode after quiz), SGNA webinars, vendor-accredited endoscope courses, accredited conference sessions
• CE credits must have occurred within the current renewal year (anniversary-month-based, not calendar-year-based)
• Renewal must be received by the last day of the anniversary month of your certification to avoid a lapse

If you also hold CRCST, your renewal fee is still $50/$60 total (not per credential), but you must submit 12 CE for CRCST + 6 CE for CER separately. Endoscope-relevant CE can sometimes count toward both, but each credential still requires its own documented credits.

CER vs CRCST vs CIS — Which Comes First?

HSPA offers a ladder of credentials, and candidates often ask which order to earn them in.

Recommended Order

• If you work primarily in an endoscopy/GI suite: CER first, then add CRCST within a year if your employer requires general SPD certification
• If you work in a general SPD with scopes as part of the mix: CRCST first, then CER as a specialty add-on (most common path)
• Experienced CRCST + instrument focus: CIS after 2 years
• Career ladder (most paid): CRCST → CIS + CER dual specialty → CHL (Certified Healthcare Leader) for management

Many CRCSTs add the CER because the $140 exam fee typically pays back in a single raise cycle — endoscopy-dedicated techs and SPD techs with CER often earn $2–$5/hour more than peers without the specialty credential.

Related HSPA Credentials

HSPA offers a full credential portfolio. Beyond CER/CRCST/CIS:

• CHL — Certified Healthcare Leader (management track, requires 5 years + CRCST)
• CSPM — Certified Sterile Processing Manager
• CFER — Certified Flexible Endoscope Reprocessor (legacy alternate name sometimes seen in older materials; current credential is CER)
• Certificate programs (non-certifications): Tracking systems, Ambulatory Surgery Center, Surgical Instrument Decontamination, Breaking the Chain of Infection

CBSPD (a separate credentialing body) offers CFER as a true separate credential — competitor to HSPA CER. HSPA CER is more widely recognized in hospital systems; CBSPD CFER is chosen by some East Coast and Midwest systems. Check your target employer's job postings to decide.

Career Outlook and Salary (2026)

Role Titles

• Endoscope Reprocessing Technician / Endoscopy Technician
• GI Technician (when reprocessing is part of duties)
• Sterile Processing Technician — Endoscopy
• Lead Endoscopy Tech / Endoscopy SPD Coordinator
• Infection Prevention Specialist — Reprocessing (advanced)

Salary (2026)

• BLS SOC 31-9093 Medical Equipment Preparers (includes CER-credentialed techs): median $47,100/year, mean $49,200, top 10% over $66,000 (BLS OEWS 2024, adjusted for 2026 wage growth)
• Endoscopy-specific differential: $2–$5/hr premium over general SPD in most metros
• Top-paying metros: Los Angeles ($59k mean), New York ($56k), Boston ($55k), San Francisco Bay ($60k+), Washington DC ($53k)
• Travel endoscopy reprocessing: $1,500–$2,000/week plus stipend for 13-week contracts; CER + CRCST dual credential often required
• Lead/Supervisor: $55k–$72k base
• Infection Prevention specialist with CER: $65k–$85k

Growth Projections

BLS projects medical equipment preparer employment to grow 10% from 2024–2034, faster than average. Endoscopy volume is growing faster than general surgery volume (GI screening expansion, outpatient procedure shift), and ST91-driven centralization is creating dedicated endoscope reprocessing roles in hospitals that previously processed scopes at the point of use. Expect continued strong demand, especially for credentialed techs.

Career Ladder

1. Year 1–2: CER or CRCST + CER, front-line reprocessing
2. Year 2–4: Lead tech or preceptor, earning ~$3–$5/hr more
3. Year 4–7: SPD Coordinator or Endoscopy Reprocessing Supervisor, salary $60k–$78k
4. Year 7+: Manager / Infection Prevention Specialist / Travel or per diem contracting

Application Process Step-by-Step

1. Accumulate 3 months of endoscope-specific reprocessing experience (within the past 3 years), documented
2. Download the HSPA CER application from myhspa.org (Revised January 2026 version)
3. Complete Sections 1–3 (personal, employment, education)
4. Have supervisor complete Section 4 experience verification (signed by someone above your rank; work contact info only)
5. Submit application + $140 fee online via myhspa.org or by mail (check/money order)
6. Wait 3–4 weeks for application review
7. Receive eligibility letter with 120-day scheduling window (no extensions granted)
8. Schedule at Prometric via the link in your eligibility letter — call 800.998.1942 or prometric.com/hspa
9. Test at Prometric — pass/fail result available at end of exam in most cases
10. Digital certificate issued within 1–2 weeks (HSPA no longer mails paper certificates as of January 2024 — print your own online)
11. Renew annually — 6 endoscope-specific CE + $50 renewal fee by the last day of your anniversary month

FAQ Quick Reference

See the dedicated FAQ section below for detailed answers to the questions candidates ask most.

Deep Dive: Leak Testing (The Single Most Tested Procedure)

Leak testing is so heavily tested on the CER that it warrants its own section. Here is what you must know cold:

Why Leak Test

Flexible endoscopes have fluid-tight external sheaths and internal channels. A leak — even a pinhole — allows water, chemistry, and bioburden to enter the electronic interior, causing both patient-safety risk (incomplete HLD of interior surfaces) and expensive damage (board shorts, CCD failure). A leak detected before manual cleaning prevents thousands of dollars of damage; a leak missed allows contaminated fluid into the optics.

When to Leak Test

Before every reprocessing cycle, on every scope, without exception. ST91 is unambiguous. Some questions will offer "only if damage is suspected" as a distractor — it is always wrong.

How to Leak Test (High-Level Workflow)

1. Connect the leak tester to the scope per IFU
2. Pressurize the scope — observe the pressure gauge (it should hold)
3. Dry test — watch for the gauge dropping (indicates leak before submersion)
4. Wet test — submerge the pressurized scope in a basin of clean water
5. Articulate the angulation knobs through full range while submerged
6. Observe for a continuous stream of bubbles — that is a leak
7. Depressurize per IFU before removing tester (skipping this damages the scope)
8. If leak detected: remove scope from service, label for repair, document

Exam Trap Questions

• "A leak test shows bubbles only when the angulation knobs are fully deflected." → Still a leak. Remove from service.
• "Pressure drops slightly during the 30-second dry test." → Still a leak. Remove from service.
• "The tech should perform the leak test after manual cleaning." → Wrong. Before. Always before.

Deep Dive: MEC (Minimum Effective Concentration) Testing

Liquid chemical sterilants (LCS) used in AERs and manual basins — OPA, peracetic acid, hydrogen peroxide, glutaraldehyde — have a manufacturer-specified minimum effective concentration. Below MEC, the solution is no longer validated to achieve HLD.

When to Test

• Before each use per most IFUs (practically, this means before each AER cycle for systems that reuse solution across cycles)
• Before the first cycle of the day at minimum per ST91
• Solutions degrade with use (organic load dilutes), time (chemistry breakdown), and dilution (rinse water contamination)

How to Test

• Use manufacturer-matched MEC test strips (OPA strips do not work for peracetic acid)
• Dip per IFU timing (typically a few seconds)
• Read against reference color chart within the specified window
• Log result with date, time, tech initials

Exam Trap Questions

• "A cycle completes but MEC reads fail." → Do not release scope. Reprocess with verified solution.
• "MEC reads pass but solution has visible cloudiness." → Per IFU, visible contamination typically requires solution change regardless of MEC.
• "Shelf life of the test strips has expired by 3 months." → Expired strips are invalid. Replace before testing.

Deep Dive: Manual Cleaning Technique

Manual cleaning is where 70%+ of bioburden is removed — before any HLD happens. Poor manual cleaning cannot be rescued by HLD.

Key Principles

• Channel-specific, single-use brushes — a bronchoscope brush is not a colonoscope brush. Most modern brushes are single-use disposable.
• Full-length brushing — pass the brush through the entire channel until it exits the other side, clean the exposed brush head, then retract (do not reverse without cleaning)
• Correct detergent concentration and temperature — enzymatic, cool-to-lukewarm (below 110°F / 43°C)
• Follow IFU for soak time — most enzymatic detergents require 2–5 minute soak to let enzymes break down protein
• Clean all accessories — valves, caps, biopsy port covers, water bottles and tubing where applicable
• Inspect after cleaning with lighted magnification — ST91:2021 requirement

Common Errors

• Reusing brushes between scopes (cross-contamination)
• Shortcutting stroke count during turnover pressure
• Missing the elevator channel on duodenoscopes
• Using the wrong enzymatic-to-water ratio (too dilute = ineffective)

Deep Dive: Drying (The 2021 ST91 Priority)

Drying got its own expanded section in ST91:2021 because residual moisture causes biofilm — and biofilm causes outbreaks.

The Drying Protocol

1. Alcohol flush — 70% isopropyl alcohol through every channel until it exits cleanly
2. Forced filtered air — medical-grade compressed air through every channel
3. Duration — validated by the facility, typically 10 minutes minimum after alcohol flush
4. All channels — instrument, air/water, suction, auxiliary water, elevator wire (duodenoscopes)
5. External surfaces — lint-free cloth

Storage Conditions

• Vertical hanging, channels uncapped (capping traps moisture)
• HEPA-filtered drying cabinets preferred — positive pressure, HEPA air, continuous channel drying
• Non-drying cabinets acceptable with shorter validated hang time
• Insertion tube straight, not coiled tightly
• Labeled with reprocessing date/time, tech, and expiration per facility policy

Exam Trap Questions

• "Can you skip alcohol flush if the forced-air drying is 15 minutes?" → No. Both are required.
• "Storing scopes in their case is acceptable if the case is clean." → Generally no — cases are transport, not storage, and trap moisture.
• "Scopes can be stored horizontally if the cabinet is HEPA-filtered." → No. Vertical hanging is the ST91 standard.

Water Quality for Endoscope Reprocessing

ST91 references AAMI TIR34 and specifies two water classes for reprocessing:

• Utility water — hospital tap water meeting basic microbiologic limits. Used for initial rinses and detergent dilution.
• Critical water (also called "treated water") — reverse osmosis or deionized, with strict microbial and endotoxin limits. Used for final rinse after HLD.

Many AERs include built-in water treatment to produce critical water; others rely on plumbed-in RO systems. A common exam trap: a question asking what water should be used for the final rinse after HLD — the answer is critical/treated water, not utility water.

Borescope Inspection and Cleaning Verification

ST91:2021 strongly recommends cleaning verification beyond visual inspection. Three main methods:

• ATP bioluminescence — swab tests for adenosine triphosphate residue; inexpensive, fast
• Protein residue tests — colorimetric strips detecting residual protein
• Borescope inspection — a small optical camera threaded through channels to visually inspect for debris, scratches, or damage. Increasingly standard for high-risk scopes (duodenoscopes, bronchoscopes)

Cleaning verification is not yet universally mandated, but the direction is clear: high-risk scopes will eventually require borescope or equivalent in regulatory surveys. Expect 1–2 CER questions on these methods.

Duodenoscope-Specific Considerations

Duodenoscopes are the highest-risk flexible endoscopes because of the elevator mechanism at the distal tip — a small moving part with complex geometry that is extraordinarily difficult to clean. FDA safety communications from 2015 onward drove reprocessing changes:

• Enhanced manual cleaning with elevator-specific brushing
• Double HLD (two consecutive HLD cycles) as an enhanced protocol at some facilities
• Culture-and-quarantine — reprocess, culture the scope, quarantine until results
• Sterilization where feasible — FDA-cleared ethylene oxide or vaporized hydrogen peroxide systems for duodenoscopes
• Disposable/single-use distal tip components — newer duodenoscope designs replace the elevator cap each cycle

Expect 2–3 CER questions specifically on duodenoscope enhanced reprocessing and the historical CRE outbreaks that drove these changes.

Bottom Line

The HSPA CER is the specialty credential that separates endoscope reprocessing professionals from general sterile processing techs. It is narrower than CRCST, deeper on ST91 and AER operation, and pays back its $140 fee within a single raise cycle in most metros. With your 3 months of endoscope-specific experience documented, a focused 4–6 week study plan, and disciplined drilling across the seven domains — especially the 32% Endoscope Reprocessing Steps domain — first-time passes are achievable.

HSPA CER practice questionsPractice questions with detailed explanations