- What You Are Actually Studying For
- Confirm Eligibility Before You Study
- Reading the Blueprint: Where the Points Live
- The Three 25% Domains
- The Three Smaller Domains
- 165 Questions, Three Hours, Closed Book
- Registration, Fees and Deadlines
- A Domain-Ordered Study Sequence
- Turning Daily Work Into Exam Prep
- After You Pass: Staying Certified
- Frequently Asked Questions
- Three domains each carry approximately 25%: Healthcare Information Technology, Healthcare Technology and Function, and Healthcare Technology Problem Solving.
- The exam is 165 multiple-choice questions in three hours, closed book, with a simple calculator permitted.
- Passing uses a criterion-referenced standard set by the modified Angoff method, not a fixed percentage.
- Exam fees are $410 for AAMI members and $460 for nonmembers; retakes are $355 and $405.
What You Are Actually Studying For
The Certified Radiology Equipment Specialist credential is issued by the Association for the Advancement of Medical Instrumentation (AAMI) and administered through its ACI certification program. It is a credential for biomedical equipment technicians who service and support radiology equipment, which is a different thing from a radiologic technologist credential that certifies the person operating an imaging system on a patient. The exam tests whether you can install, maintain, troubleshoot and safely support imaging technology and the networks it lives on.
If you are still orienting yourself, the explainers on what CRES certification is and what CRES stands for cover the basics. This guide assumes you have decided to sit for the exam and want a plan built around how the exam is actually weighted.
Confirm Eligibility Before You Study
It is a common mistake to study for months and then discover that your work history does not satisfy the application. Full certification requires one of three pathways:
- An associate degree or higher in electronics, technology or science, plus two years of full-time biomedical equipment technician (BMET) experience.
- A U.S. military biomedical equipment technology program, plus two years of full-time BMET experience.
- Four years of full-time BMET experience.
On top of the pathway, at least 40% of your work experience during the preceding two years, or 25% during the preceding five years, must be in the designated specialty. A bachelor's degree does not replace the work-experience requirement, and degree or military-program documentation is required if you claim either of those pathways.
If you have the qualifying degree, military program or two years of full-time BMET experience but not yet the full experience, you may qualify for candidate status. Candidates have five years to meet the full-certification requirements. The details are laid out in CRES requirements and how to qualify, and you should read that before you pay for anything.
Reading the Blueprint: Where the Points Live
The current live content outline lists six domains. Notice how lopsided the distribution is: three domains together account for approximately 75% of the exam, and the remaining three share the rest.
| Domain | Approximate Weight | Character of the Material |
|---|---|---|
| Anatomy & Physiology | 7% | Memorization and body-system context |
| Fundamentals of Electricity and Electronics | 10% | Theory, circuits, calculations |
| Healthcare Information Technology | 25% | Networks, data, connectivity |
| Healthcare Technology and Function | 25% | How radiology systems operate |
| Healthcare Technology Problem Solving | 25% | Diagnosis and fault isolation |
| Public (employee, patient, visitor) Safety in the Healthcare Facility | 8% | Hazards, protection, regulations |
These allocations reflect the current outline rather than the older 2018 weights that still circulate in forums and legacy study notes. If a study resource quotes different percentages, check its date. For a deeper walkthrough of every area, see the full CRES exam domains guide.
The Three 25% Domains
Because these three areas make up roughly three-quarters of the exam, a candidate who is strong across all of them has a large margin for weakness elsewhere. A candidate who is weak in even one of them cannot easily recover by acing the small domains.
Healthcare Information Technology (approx. 25%)
Modern imaging equipment is a networked computing system. This domain rewards technicians who understand how an imaging modality exchanges data with the rest of the hospital, not just how the hardware works in isolation.
- Network fundamentals: addressing, switching, routing and how a modality reaches a server or archive
- How imaging data is stored, transmitted and retrieved across the facility
- Connectivity troubleshooting concepts when a device cannot communicate
- Security, backup and data-integrity concerns for clinical systems
Biomedical technicians who came up through purely mechanical or electronic repair often find this the steepest climb. If your daily work rarely touches the network side, start here early and give it more hours than its peers.
Healthcare Technology and Function (approx. 25%)
This is the "how does it work" domain. Expect questions that ask you to reason about the purpose and behavior of radiology systems and their subsystems.
- The function of major imaging system components and how they interact in the imaging chain
- Preventive maintenance concepts and the reasoning behind them
- Normal operation versus abnormal behavior, so you can recognize what "wrong" looks like
- The relationship between a system's design and the image it produces
Healthcare Technology Problem Solving (approx. 25%)
Problem-solving questions are scenario-driven. You are given symptoms and asked to identify the most likely cause, the best next step, or the safest course of action.
- Structured fault isolation: narrowing from symptom to subsystem to component
- Interpreting test results and performance indicators
- Deciding when a device should be removed from clinical use
- Recognizing when a problem is electronic, mechanical, software-related or network-related
The Three Smaller Domains
The three smaller domains total roughly 25% combined, but they should not be ignored. They tend to contain the most "knowable" questions, where a focused review converts directly into points.
Fundamentals of Electricity and Electronics (approx. 10%)
Because a simple calculator is permitted, expect some questions that involve working a value rather than just recalling a definition. Be comfortable with the relationships among voltage, current, resistance and power, with series and parallel circuit behavior, and with the roles of common components such as capacitors, inductors, diodes and transistors. If you earned an electronics degree, this may be your safest domain; if you did not, build it carefully because it underpins your reasoning in the equipment domains.
Public Safety in the Healthcare Facility (approx. 8%)
This domain covers protecting employees, patients and visitors. For a radiology specialist, think about radiation protection principles, electrical safety, infection control, and the general hazards of working around clinical equipment. These questions often hinge on knowing the single safest or most compliant response, which makes careful reading as important as recall.
Anatomy & Physiology (approx. 7%)
The smallest domain, but one that surprises technicians who never needed clinical vocabulary on the job. You do not need to think like a physician. You need enough body-system knowledge to understand what an imaging study is looking at and why a given modality is chosen for a given structure. Short, repeated review is more efficient here than long sessions.
165 Questions, Three Hours, Closed Book
The exam consists of 165 multiple-choice questions with a three-hour limit. It is closed book, and a simple calculator is permitted. That works out to a little over one minute per question, which is comfortable for recall items and tight for multi-step scenarios, so your pacing needs to flex by question type.
Passing is determined by a criterion-referenced standard established through the modified Angoff method. In plain terms, a panel of subject-matter experts judges how a minimally qualified candidate would perform on each item, and the cut score derives from that judgment. This means there is no published "you need X percent" that you can chase, and you should be skeptical of anyone who claims one. The nuance is explained in what you need to pass, and if you are weighing the odds, see how hard the CRES exam is and what the available data says about the CRES pass rate.
Key Takeaway
Because the pass standard is criterion-referenced rather than a fixed percentage, the goal is competence across the whole blueprint, not hitting a magic number. Aim to be solid in every domain and strong in the three 25% areas.
Registration, Fees and Deadlines
The exam is delivered by computer at approved Kryterion testing centers and scheduled through Webassessor. Plan around a testing center visit rather than assuming you can take it at home.
| Item | AAMI Member | Nonmember |
|---|---|---|
| Examination fee | $410 | $460 |
| Retake fee | $355 | $405 |
Regular testing windows run May 1-15 and November 1-15. For the November 1-15, 2026 window, the application deadline is October 16, and late registration closes October 23 with a $50 late fee. Build your study calendar backward from the application deadline, not from the testing window itself, because an approved application has to exist before you can schedule a seat. Full details on timing are in the guide to CRES exam dates and deadlines, and a broader financial picture, including renewal costs, is in the CRES certification cost breakdown.
A Domain-Ordered Study Sequence
The one piece of generic planning worth including is an ordering that follows the blueprint. The logic: build the foundation first, attack the heaviest and hardest domains while you are fresh, and finish with the small, high-yield areas and full-length practice.
Foundation: Electricity and Electronics
- Rework circuit relationships and component behavior until calculations are automatic
- Practice with the same type of simple calculator you will use on test day
Healthcare Information Technology
- Give this the most time if networking is not part of your daily work
- Trace how an imaging study travels from modality to storage to viewer
Technology and Function, then Problem Solving
- Learn each system's normal behavior before practicing fault isolation
- Work scenario questions and write out why each distractor fails
Safety, Anatomy & Physiology, and Full Practice
- Review the two smallest domains in short, repeated sessions
- Take timed practice sets sized to the real 165-question, three-hour format
Adjust the length to your background. A technician with years of imaging service experience and a networking-heavy role may compress the early weeks, while someone coming from general BMET work may need to double the IT block. The one-page CRES cheat sheet is useful for the final week, but it is a review tool, not a substitute for building understanding.
Turning Daily Work Into Exam Prep
Your job is your best study resource, provided you narrate it. Each time you troubleshoot a modality, mentally map the event to a domain: was this an IT connectivity issue, a function question, or a safety consideration? That habit trains the classification skill the problem-solving domain demands.
- Ask "what changed?" Exam scenarios usually hinge on a recent change or a single anomalous symptom.
- Read service documentation for the reasoning, not the steps. The exam tests why a procedure exists.
- Shadow the network team. If Healthcare Information Technology is your weak area, an hour with your hospital's network staff beats an hour of reading.
- Use targeted practice questions. Work through the question bank on the main practice test site and log every miss by domain so your review follows your actual gaps.
If you are weighing a formal course versus self-study, see the overview of CRES training. Whatever route you take, remember that the six domains are exam objectives, not preparation-course modules, so a resource's chapter order is not a guarantee of how the exam is organized.
After You Pass: Staying Certified
Certification is maintained, not permanent. Renewal requires at least 30 ACI CEUs in a three-year reporting cycle, including at least 15 in Category IV: Professional Development. You report through My Active CEU Journal and pay $100 for members or $150 for nonmembers. The current FAQ requires the CEUs to be earned by December 31 of the recertification year.
For the career side of the decision, the CRES salary guide, CRES jobs overview and return-on-investment analysis help you decide how the credential fits your plans. Typical employers include hospital clinical engineering departments, independent service organizations and imaging equipment manufacturers' service teams.
Frequently Asked Questions
Prioritize Healthcare Information Technology, Healthcare Technology and Function, and Healthcare Technology Problem Solving. Each is approximately 25%, together roughly 75% of the exam. Spend extra time on whichever of the three you work with least in your daily job.
The exam has 165 multiple-choice questions and a three-hour time limit. It is closed book, but a simple calculator is permitted.
No. Passing is criterion-referenced and set through the modified Angoff method, so it is not a guessed fixed percentage. Focus on mastering the blueprint rather than chasing a single score.
The exam fee is $410 for AAMI members and $460 for nonmembers, with retakes at $355 and $405. Regular testing windows are May 1-15 and November 1-15. For the November 2026 window, apply by October 16; late registration closes October 23 with a $50 fee.
You may qualify for candidate status if you hold the qualifying degree, military program or two years of full-time BMET experience. Candidates then have five years to meet the full-certification requirements. A bachelor's degree alone does not replace the work-experience requirement.
A first-attempt pass comes from matching your hours to the blueprint: verify eligibility early, put your heaviest effort into the three 25% domains, and rehearse the real 165-question, three-hour format before test day. For deeper dives on any single topic, return to the CRES study guide hub, and use the practice tests to find out where your preparation still has gaps.