- The Pass Rate Question: What Is Actually Published
- Why Substitute Statistics Mislead
- What "Passing" Means on This Exam
- Format and Endurance: Where Candidates Lose Points
- Where the Content Load Sits Across 18 Domains
- The Eligibility Pipeline Shapes Who Sits the Exam
- The Cost Side of a Missed Attempt
- A Domain-Sequenced Plan for Passing
- After Passing: Oral Stage and Ongoing Certification
- Frequently Asked Questions
- No AOBR diagnostic radiology pass rate has been verified, so any specific percentage you see quoted deserves skepticism.
- The written exam is 300 multiple-choice questions, roughly 50 physics and 250 imaging, over five hours of testing.
- Passing requires a scaled score of 500 on a 200-800 scale, not a raw percentage correct.
- Written and oral fees are $800 each, so the two standard initial-stage fees total $1,600.
The Pass Rate Question: What Is Actually Published
Candidates searching for a diagnostic radiology pass rate usually want one thing: a number that tells them how worried to be. For Primary Certification in Diagnostic Radiology, issued by the American Osteopathic Board of Radiology (AOBR) with AOA certification approval, that number has not been verified. No AOBR pass rate for the written examination was located in the issuer's current published materials, and this article will not invent one.
That is a meaningful finding, not a gap to paper over. Osteopathic radiology is a small specialty pool, and small certification cohorts rarely produce stable year-over-year percentages even when a board does publish them. What the issuer does publish, in detail, is the exam structure, the scoring standard, the fee schedule and the eligibility pathway. Those are the levers a candidate can actually evaluate, and they are the focus here.
If you are still orienting yourself to the credential itself, the overview at What Is Diagnostic Radiology Certification? covers the pathway, and Diagnostic Radiology Certification sets out how the pieces fit together.
Why Substitute Statistics Mislead
When a credential-specific pass rate is missing, people reach for neighbors. Two substitutes appear constantly, and both are wrong for this purpose.
Other Boards' Statistics
Statistics published by a different radiology certifying body describe that body's exam, that body's candidates and that body's scoring model. This credential is not that exam. Importing those numbers answers a question nobody asked.
Residency-Level Success Rates
Residency programs sometimes advertise board-passage outcomes. Those are program-level figures that depend on cohort size, which exam was taken and how the program counts first attempts versus repeats. They are not a certification-wide pass rate, and they cannot be converted into one.
| Source of a "Pass Rate" | Does It Describe This Exam? | How to Use It |
|---|---|---|
| AOBR published statistics | Yes, but none verified for the written exam | Check the issuer directly before relying on any figure |
| Another radiology board's statistics | No | Ignore for planning |
| Residency program marketing | Not as a certification-wide rate | Context only, not a benchmark |
| Forum or social media claims | Unverifiable | Disregard |
The practical conclusion is straightforward: plan against the exam's structure and scoring standard rather than against a rumor. The companion piece How Hard Is the Diagnostic Radiology Exam? Complete Difficulty Guide 2026 takes the same structure-first approach to difficulty.
What "Passing" Means on This Exam
The written passing score is scaled 500 on a 200-800 scale. This detail matters more than it looks, because a scaled score is not a percentage of questions answered correctly. Scaling exists so that a score of 500 represents the same level of competence across different versions of the exam, even if one form happens to be slightly harder than another.
- You cannot convert 500 into a raw percent. The issuer does not publish a "number correct" equivalent, so do not trust anyone who tells you that you need to get a specific count of questions right.
- The scale floor is 200, not zero. A score of 500 is not "halfway" in any intuitive sense.
- Two sections of content, one result. The exam spans a physics portion and a much larger imaging portion, and your standing is judged against the single scaled standard.
For a closer look at how the number works, see Diagnostic Radiology Passing Score 2026: Exactly What You Need to Pass.
Format and Endurance: Where Candidates Lose Points
A pass rate is partly a story about format. The written examination is 300 multiple-choice questions delivered in three 100-minute sections, totaling five hours of testing. Optional ten-minute section breaks sit outside that testing time. The issuer describes approximately 50 physics questions and 250 imaging questions, without publishing percentage weights, and this article will not convert those counts into percentages.
Several features of that format create risk independent of how much you know:
- Sustained concentration. Five hours of testing across three sittings of 100 minutes each rewards candidates who have practiced long blocks, not just short quizzes.
- Volume of imaging recall. Roughly 250 imaging questions span organ systems from neuroradiology to pediatrics, so pattern recognition has to be broad and fast.
- A distinct physics hurdle. Physics is a separate content part, and radiology trainees often feel less fluent there than in image interpretation.
Remote Delivery Considerations
Written delivery can follow remote-proctored procedures using the MonitorEDU Secure Browser and the PARADIGM platform. Technical readiness is a real variable: confirm your setup against the issuer's remote-proctoring instructions well before test day so a software issue never competes with your concentration. The official guidance lives on the AOBR remote-proctored exam page, linked from the certification process pages.
Key Takeaway
Practice in three consecutive 100-minute blocks at least several times before the exam. Endurance across five testing hours is a trainable skill, and it is one of the few pass-rate factors fully within your control.
Where the Content Load Sits Across 18 Domains
The published content outline is organized into eighteen topic entries. That figure is the count of published topic entries, not an issuer-declared number of top-level domains. The first eight reproduce the physics part; the remaining ten reproduce the diagnostic imaging part. Ultrasound and Nuclear Medicine appear twice on purpose, once under each part, because the physics and the clinical imaging treatments are tested differently. The full walkthrough is in Diagnostic Radiology Exam Domains 2026: Complete Guide to All 18 Content Areas.
Part I: Physics (Domains 1-8)
Roughly 50 questions draw from these areas, and they reward precise conceptual understanding over image recognition.
- Biological effects and safety and Radiation Biology (health effects), which cover how radiation affects tissue
- Radiological Physics, covering radiation production and interaction with matter
- Radiation Safety and Protection, the applied side of dose and shielding
- Radiological Imaging, spanning radiography, fluoroscopy, CT and mammography
- Ultrasound, MRI and Nuclear Medicine as physics topics
Part II: Diagnostic Imaging (Domains 9-18)
Roughly 250 questions come from the imaging part, which is where most of the exam's volume lives.
- Neuroradiology and Vascular/Interventional Radiology
- Cardiopulmonary and Genitourinary Tract
- Ultrasound and Breast Radiology
- Gastrointestinal Tract and Musculoskeletal
- Pediatric Radiology and Nuclear Medicine
A useful way to think about passing risk: imaging carries the bulk of the questions, but physics is where candidates with strong clinical instincts can be caught off guard. A balanced preparation plan protects against both failure modes. The one-page review in Diagnostic Radiology Cheat Sheet 2026: One-Page Review of Must-Know Facts is useful for last-pass reinforcement.
The Eligibility Pipeline Shapes Who Sits the Exam
Pass-rate conversations ignore a quiet fact: this exam is only open to candidates who have already cleared a demanding training pipeline. That filtering effect means the candidate pool is not a random sample of medical graduates. Eligibility includes:
- A qualifying medical degree or a valid ECFMG pathway
- A one-year approved internship
- A four-year diagnostic radiology residency that includes 700 nuclear-medicine training hours
- Active licensure, plus ethics and training approval
One wrinkle deserves honesty. The written-exam page contains a bullet referring to second-year residents, yet it explicitly restricts the combined written examination to third-year or later residents. That conflict exists in the issuer's own materials and is retained here rather than silently reconciled. Confirm your own timing directly with the AOBR before you apply. The full requirement list is in Diagnostic Radiology Requirements 2026: Eligibility, Prerequisites & How to Qualify, and the training background is covered in Diagnostic Radiology Training.
Oral entry requires written success and fourth-year or later training. The oral stage is a second gate with its own demands, which means "passing" this certification is a two-stage achievement, not a single event.
The Cost Side of a Missed Attempt
Fees turn the abstract idea of a pass rate into something concrete. Written and oral fees are $800 each, and those amounts include the listed corresponding reexamination fees. The two standard initial-stage fees total $1,600 by simple addition. Payment mechanics are on the AOBR applications-and-payment page.
| Stage | Fee | Notes |
|---|---|---|
| Written examination | $800 | Includes the listed corresponding reexamination fee |
| Oral examination | $800 | Includes the listed corresponding reexamination fee |
| Two standard initial-stage fees | $1,600 | Sum of the two stages above |
The listed reexamination coverage softens the direct financial penalty of a retake, but the larger cost is time, delayed oral eligibility and the career momentum tied to certification. The full budgeting picture, including ongoing maintenance, is in Diagnostic Radiology Certification Cost 2026: Complete Pricing Breakdown.
A Domain-Sequenced Plan for Passing
Without a published pass rate, the rational response is to reduce your personal risk using the exam's real structure. Here is a sequencing that front-loads the area most likely to cause trouble and saves volume-heavy imaging review for when pattern recognition is sharpest.
Physics Foundation (Domains 1-5)
- Radiation production, interaction with matter, biological effects and protection
- Radiography, fluoroscopy, CT and mammography physics, including dose concepts
- Why first: physics is a distinct part and benefits from early, repeated exposure
Modality Physics (Domains 6-8)
- Ultrasound, MRI and nuclear medicine physics
- Pair each with its imaging-part counterpart so the two treatments reinforce each other
High-Volume Imaging (Domains 9-12)
- Neuroradiology, Vascular/Interventional, Cardiopulmonary, Genitourinary
- Heaviest organ-system content; build image-pattern fluency
Remaining Imaging (Domains 13-18)
- Ultrasound, Breast, Gastrointestinal, Musculoskeletal, Pediatric, Nuclear Medicine
- Finish with full-length, three-block simulations to rehearse five-hour stamina
That single schedule is the only generic-style planning in this article, and it is tied directly to the two-part content structure. For a fuller method, including how to review missed items, read Diagnostic Radiology Study Guide 2026: How to Pass on Your First Attempt. You can also pressure-test your readiness with timed questions on the main practice test site.
After Passing: Oral Stage and Ongoing Certification
Clearing the written exam is not the finish line. The oral stage follows, and the issuer's oral page states a 4.5-hour examination, eight cases, 20 minutes per case and a requirement to pass all ten stations. Those statements do not reconcile into a single clean case count or timer, so verify the current format directly with the board. The ten oral subject headings are retained within Domains 9-18, which means your imaging preparation does double duty. Note also that the timeline's oral application dates conflict with the oral page's relative application windows, so confirm deadlines with the AOBR rather than assuming either source is authoritative. Date planning is covered in Diagnostic Radiology Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Staying Certified
Ongoing certification is handled through Osteopathic Continuous Certification (OCC). Current OCC includes automatic enrollment for time-limited diplomates and a $300 annual fee. For 2025-2027, the requirements include:
- 60 CME credits per three-year cycle, with no category or specialty quota under the current component guidance (which takes precedence over the overview's older specialty-credit wording)
- 15 SAMs/SA-CME per three-year cycle, which also count toward CME
- Active licensure and one practice-performance assessment per cycle
- A current cognitive assessment, which replaces the former ten-year OCC examination
One caution: an older 2013 policies document describes a historical separate-exam structure and legacy ten-year certificates. It is not a verified current blueprint, and a validity term for newly issued certificates is not independently asserted here. If you are weighing the long-term value of the credential, Is the Diagnostic Radiology Certification Worth It? Complete ROI Analysis 2026 and Diagnostic Radiology Jobs explore the career side, and Diagnostic Radiology Salary Guide 2026: Complete Earnings Analysis addresses compensation.
Key Takeaway
Treat the missing pass rate as a prompt to prepare by structure: respect the physics part, build five-hour endurance, cover all 18 topic entries and verify every deadline and format detail with the AOBR itself.
Frequently Asked Questions
No AOBR diagnostic radiology pass rate was verified for this article. Statistics from other radiology boards and residency-level outcomes describe different populations and cannot stand in for it. Contact the AOBR directly if you need an official figure.
The written passing score is scaled 500 on a 200-800 scale. It is not a raw percentage, and the issuer does not publish a conversion to a number of questions answered correctly.
It contains 300 multiple-choice questions in three 100-minute sections, for five hours of testing. Optional ten-minute section breaks fall outside that time. Approximately 50 questions cover physics and 250 cover imaging.
The written and oral fees are $800 each, including the listed corresponding reexamination fees. The two standard initial-stage fees total $1,600 by addition.
Yes. Oral entry requires written success and fourth-year or later training. The oral stage then requires passing all ten stations, so confirm the current oral format and application windows with the AOBR before planning.