- The CER exam has 150 questions (125 scored, 25 unscored) across 7 domains; allocate study time proportionally to domain weight.
- Domain 4 (Endoscope Processing Steps) is the largest at 32%-plan at least two full study weeks around it.
- You need 3 months of documented hands-on reprocessing experience before sitting for the exam; paper knowledge alone is not enough.
- The $140 exam fee is paid through HSPA/Prometric; understanding scheduling logistics prevents costly rescheduling fees.
Why an 8-Week Window Works for CER
Eight weeks is long enough to cover all seven CER content domains thoroughly and short enough to maintain focus without losing momentum. The Certified Endoscope Reprocessor (CER) credential is administered by the Healthcare Sterile Processing Association (HSPA) through Prometric Testing Centers-a computer-based, closed-book, 3-hour examination. Every minute you invest before exam day should map directly to the domains, question formats, and reprocessing concepts that actually appear in the test.
This plan is built around the May 2022 CER content outline, the version currently in use. If you have already logged your 3 months of hands-on endoscope reprocessing experience-the documented prerequisite-you are eligible to register. If you are still accumulating those hours, use the early weeks of this schedule to study while you work the floor.
Exam Mechanics You Must Know Before Week 1
Understanding how the CER is scored changes how you study. The exam uses criterion-referenced scoring based on the Angoff/Beuk methodology. HSPA does not publish a numeric cut score-passing is determined by a panel-established standard of minimally acceptable competence, not by beating other candidates. There is no curve, no ranking, and no benefit to finishing early just to say you did.
Of the 150 multiple-choice questions you will see, only 125 are scored. The remaining 25 are unscored pilot questions embedded throughout the test-you will not know which ones they are. This means you treat every single question with equal seriousness. Rushing through what feels like an "easy" question cluster is risky; those questions are scored and count toward your result.
The exam includes a tutorial before the clock starts and review tools you can use during the session. Practice with Prometric's own interface if possible, but at minimum use CER practice tests that simulate the multiple-choice format under timed conditions so the interface feels familiar on test day.
For a detailed breakdown of how HSPA reports your result, see our companion article on the CER Exam Score Report: How Pass/Fail Is Determined 2026. Understanding the scoring methodology before you start studying helps you prioritize domains intelligently rather than chasing a phantom numeric target.
Breaking Down the Seven Domains
The CER content outline divides knowledge into seven domains. Study time should mirror their exam weight. Below is each domain with the specific competencies that distinguish CER questions from generic sterile processing content.
Domain 1: Microbiology and Infection Control (12%)
Candidates must understand pathogen classification relevant to endoscope contamination, the chain of infection, and the specific infection risks associated with flexible endoscopes.
- Biofilm formation on endoscope channels and why it resists standard disinfection
- Levels of disinfection: high-level, intermediate, and low-level in the endoscope context
- Healthcare-associated infection (HAI) transmission routes specific to GI and pulmonary endoscopy
Domain 2: Endoscope Purpose, Design and Structure (10%)
Knowing how an endoscope is built tells you exactly where contamination hides and why each reprocessing step exists.
- Lumens, channels (biopsy, air/water, suction), elevator mechanisms, and insertion tubes
- Differences between flexible and rigid endoscopes and their distinct reprocessing implications
- Compatibility of scope components with specific chemicals and temperatures
Domain 3: Work Area Design (12%)
This domain covers the physical environment that makes safe reprocessing possible-a topic often underestimated by candidates who focus only on the hands-on steps.
- Dirty-to-clean workflow design and airflow requirements
- Sink and AER (automated endoscope reprocessor) placement
- Personal protective equipment (PPE) requirements by zone
- Temperature, humidity, and ventilation standards in the reprocessing area
Domain 4: Endoscope Processing Steps (32%)
The single largest domain. Nearly one-third of your scored questions come from here. Every step in the reprocessing sequence-from point-of-use treatment through drying and storage-ready inspection-must be known in exact order and rationale.
- Point-of-use treatment and bedside precleaning
- Leak testing before immersion
- Manual cleaning: enzymatic detergent concentration, brush selection, channel flushing
- High-level disinfection (HLD): chemical contact time, MEC (minimum effective concentration) testing
- Rinsing, drying, and alcohol flush of channels
- Documentation at each step
Domain 5: Endoscope Handling, Transport and Storage (16%)
The second-largest domain addresses what happens after reprocessing is complete-and where contamination can undo all the work done in the reprocessing room.
- Hang time limits and storage cabinet requirements
- Transport containers and contamination prevention during transit
- Inspection criteria before a scope is considered patient-ready
Domain 6: Endoscope Tracking, Repair and System Maintenance (10%)
This domain tests understanding of traceability systems, AER maintenance cycles, and damage recognition.
- Scope tracking software and manual logbook requirements
- Visual damage indicators: fraying, cracking, channel obstruction
- AER maintenance schedules and filter changes
Domain 7: Human Factors That Impact Endoscope Systems (8%)
The smallest domain but not one to ignore. Questions here address staff competency verification, communication breakdowns, and ergonomic risk in the reprocessing environment.
- Competency assessment documentation for reprocessing technicians
- Fatigue, high volume, and workflow interruptions as contamination risk factors
- Training and quality improvement as systemic safeguards
The 8-Week CER Study Plan
Each week below is anchored to specific domains and CER-relevant tasks. Lighter-weighted domains are paired together; heavy domains get dedicated weeks. Use spaced repetition on flashcards for terminology (enzymatic detergent ratios, MEC testing intervals, storage time limits) but anchor every concept to a reprocessing scenario-the CER tests application, not recall alone.
Foundation: Microbiology + Exam Logistics
- Read Domain 1 (Microbiology and Infection Control) in full from HSPA materials
- Map biofilm formation and HAI transmission to real scopes you use at work
- Confirm Prometric appointment is scheduled; download the CER Candidate Handbook
- Take a baseline CER practice test to identify knowledge gaps before structured study begins
Scope Anatomy: Domain 2
- Study endoscope components with diagrams-label every channel and port
- Compare flexible vs. rigid scope reprocessing implications side by side
- Create flashcards for scope-specific terminology (elevator, biopsy channel, angulation)
Environment: Domain 3 (Work Area Design)
- Study dirty-to-clean workflow diagrams; sketch your own facility's layout and compare
- Memorize PPE requirements by zone and the rationale behind each
- Review ventilation and sink requirements from SGNA/AAMI guidelines referenced in CER outline
Core Domain 4 - Part 1: Precleaning Through Manual Cleaning
- Master point-of-use treatment sequence step by step
- Study leak testing: wet vs. dry methods, pass/fail criteria, what happens if you skip it
- Enzymatic detergent: concentration ranges, water temperature, soak time, brush selection by channel diameter
Core Domain 4 - Part 2: HLD, Rinsing, and Drying
- High-level disinfectants: glutaraldehyde, OPA, peracetic acid-contact time and MEC testing
- AER cycles vs. manual HLD: when each is appropriate
- Alcohol flush and forced-air drying of channels-why incomplete drying creates biofilm risk
- Run 30-40 Domain 4 practice questions; review every incorrect answer's rationale
Handling, Storage, and Tracking: Domains 5 and 6
- Storage cabinet standards: hang-style vs. closed cabinet, humidity and air circulation requirements
- Scope transport: contamination prevention, rigid vs. soft carriers
- Tracking systems: patient-to-scope linking, lot traceability, repair documentation
- AER filter change intervals and maintenance log requirements
Human Factors + Full-Length Practice Exam
- Complete Domain 7 study: competency verification, fatigue risk, quality improvement cycles
- Sit a full 150-question timed practice exam under exam-day conditions
- Score by domain-identify which areas still show gaps
Targeted Review and Confidence Building
- Return only to weak domains identified in Week 7 practice exam
- Review CER question stem patterns-scenario-based, "which action is correct first," patient safety priority
- Final light review 48 hours before exam; no new material in the last 24 hours
- Confirm Prometric location, ID requirements, and arrival time
Deep Dive: Endoscope Processing Steps
Because Domain 4 represents 32% of the exam, it deserves special attention beyond what fits in a weekly plan. The questions in this domain rarely test simple recall. You will be presented with scenarios: a technician skips the pre-clean at bedside, a scope fails the leak test mid-process, an AER cycle is interrupted. Your job is to identify the correct next action based on established reprocessing protocols.
The sequence matters: point-of-use treatment → transport to reprocessing area → leak testing → manual cleaning → rinsing → HLD or sterilization → rinsing post-HLD → drying → inspection → storage. Every arrow in that chain is a potential exam question. Know not just what each step is but why it must happen in that order and what the consequence of skipping it is.
Chemical selection is another high-yield area. MEC (minimum effective concentration) testing for glutaraldehyde and OPA is a concrete, testable skill. Know what a test strip result means, when to discard the solution, and what documentation is required. These are not theoretical-they are daily tasks in a reprocessing department, and the CER holds you accountable for knowing them precisely.
How CER Questions Are Written
All 150 questions are multiple-choice with a single best answer. The CER does not use "select all that apply" or matching formats. What it does use extensively are scenario stems: a brief clinical or operational situation followed by a question about what the technician should do, identify, or document.
| Question Type | What It Tests | Example Domain |
|---|---|---|
| Sequential action | Correct order of reprocessing steps | Domain 4 |
| Environmental compliance | Work area standards and PPE requirements | Domain 3 |
| Damage/defect recognition | Visual inspection criteria for scopes | Domain 6 |
| Infection risk identification | Biofilm, HAI pathways, disinfection levels | Domain 1 |
| Human factors scenario | Staff behavior, fatigue, documentation lapses | Domain 7 |
| Storage and transport decision | Hang time, container selection, patient-ready criteria | Domain 5 |
Practicing with realistic question sets is the most direct way to build fluency with this format. Use CER-specific practice tests that reflect the May 2022 content outline rather than generic sterile processing question banks that don't address endoscope-specific scenarios.
Key Takeaway
The 25 unscored pilot questions are indistinguishable from the 125 scored ones. Never dismiss a question as "probably unscored." Treat every question with the same deliberate reasoning you'd apply to a real patient-safety decision in your reprocessing department.
Weeks 7-8: Sharpening, Not Adding
The final two weeks of this plan are about precision, not expansion. The most common mistake candidates make is continuing to add new material in Week 8. Your brain needs consolidation time-review and application, not new input.
In Week 7, the full-length timed practice exam serves a specific diagnostic purpose: it tells you where to spend Week 8. If your Domain 3 (Work Area Design) questions are all correct but your Domain 5 (Handling, Transport and Storage) answers are inconsistent, Week 8 is a Domain 5 week-even though it is only 16% of the exam.
In Week 8, avoid the temptation to read entirely new resources. Return to materials you already understand and work through them with greater precision. Re-read the scoring methodology article at CER Exam Score Report: How Pass/Fail Is Determined 2026 to remind yourself what the passing standard actually represents: minimum acceptable competence as defined by an expert panel, not perfection.
On exam day itself, the Prometric interface will include a tutorial before your 3-hour clock begins. Use it. Flag questions you are uncertain about for review, but do not spend so long on one question that you compress your time on the final sections. Pace yourself to spend roughly 72 seconds per question on average, leaving time to revisit flagged items.
After you pass, remember that CER certification renews annually. You will need 6 endoscope-reprocessing continuing education credits plus the HSPA renewal fee each year. Starting to accumulate those CE hours during your study period-through webinars, HSPA events, or manufacturer education sessions-means you are never scrambling at renewal time.
Frequently Asked Questions
No. The CRCST is not a prerequisite for the CER. You need only 3 months of documented hands-on endoscope reprocessing experience. Many candidates hold the CER as a standalone credential or pursue it alongside, not after, the CRCST.
HSPA does not publish a numeric cut score. The pass/fail standard is determined through the Angoff/Beuk criterion-referenced methodology, established by a panel of subject matter experts. You will receive a pass or fail result, not a raw score or percentage.
Prioritize Domain 4 (Endoscope Processing Steps, 32%) and Domain 5 (Handling, Transport and Storage, 16%) first-they together represent nearly half the exam. Then move to Domains 1 and 3 (12% each). Cover Domains 2, 6, and 7 with focused review sessions in your final week.
No. The 25 unscored pilot questions are embedded throughout the exam without any marking or indication. You will see 150 questions and have no way to distinguish which 25 are unscored. Approach every question as if it counts-because 125 of them do.
Yes, and working in a reprocessing department is an advantage. The CER tests applied knowledge, not just theory. Map your daily tasks directly to the domain being studied that week-manual cleaning shifts become Domain 4 reinforcement, and working with tracking software reinforces Domain 6. Plan for 60-90 minutes of focused study on weekdays and longer sessions on weekends.