- The Official Pass-Rate Numbers
- How to Read the Data Without Overreading It
- First-Time vs. Overall: Why the Gap Exists
- Where the Points Live: Domain Weights and Pass Risk
- The Format Factor: Image Hotspots and Scaled Scoring
- The SPI Dependency Behind the Abdomen Pass Rate
- A Domain-Weighted Plan Built Around the Numbers
- What a Pass Unlocks
- Frequently Asked Questions
- Inteleos publishes 2023 abdomen pass rates of 72% first-time and 64% overall; 2022 was 69% and 61%.
- First-time candidates pass more often than the overall pool, which includes repeat testers.
- Domain 2 (Pathology, Vascular Abnormalities, Trauma, and Postoperative Anatomy) is 42% of the exam, the largest single block.
- A scaled score of 555 on the 300-700 scale is the published passing mark.
The Official Pass-Rate Numbers
If you are weighing the Registered Diagnostic Medical Sonographer - Abdomen (RDMS) credential, the first thing to know is that the data you can trust is limited and specific. The American Registry for Diagnostic Medical Sonography (ARDMS), administered through Inteleos, publishes historical pass rates for the Abdomen exam on its official exam page. Those are the only figures this article treats as fact.
| Exam Year | First-Time Pass Rate | Overall Pass Rate |
|---|---|---|
| 2023 | 72% | 64% |
| 2022 | 69% | 61% |
Two things stand out immediately. First, the trend between the two published years moved upward on both measures: first-time rose from 69% to 72%, and overall rose from 61% to 64%. Second, the first-time rate sits roughly eight percentage points above the overall rate in each year. Both observations matter for how you plan, and both are easy to misread, which is why the next sections slow down on interpretation.
Notice what is not here: we are not quoting 2024, 2025, or 2026 pass rates, because those are not part of the published data we can verify. Any site claiming a precise 2026 pass rate for this exam without citing the Inteleos exam page should be treated with caution. For a broader look at difficulty beyond the raw percentages, see our guide on how hard the RDMS exam really is.
How to Read the Data Without Overreading It
A pass rate is a population statistic, not a personal forecast. Several cautions apply when you look at the abdomen figures.
Two data points are not a trend line
Two consecutive years showing a three-point improvement is encouraging, but it is not enough to conclude the exam is getting easier or that candidates are getting better prepared. Year-to-year movement of a few points can come from changes in who sits for the exam, how many candidates are repeating, or ordinary statistical variation. Treat the numbers as a rough band: somewhere around two-thirds of everyone testing passes, and somewhat more of the first-timers do.
The pool is not a random sample of sonographers
People taking the Abdomen exam are not a cross-section of the profession. They are students finishing programs, working sonographers adding a specialty, and candidates retaking after a previous attempt. Your own odds depend far more on your preparation and your scanning exposure than on the headline rate.
First-Time vs. Overall: Why the Gap Exists
The overall pass rate is lower than the first-time rate in both published years. The most natural explanation is arithmetic: the overall figure pools every attempt, including candidates who failed before and are trying again. Repeat testers, as a group, have already demonstrated some gap in readiness, so their inclusion pulls the blended number down.
The practical takeaway is encouraging and cautionary at once:
- Encouraging: Your first attempt is statistically your strongest. Candidates who prepare thoroughly before the first sitting are the ones lifting the first-time number.
- Cautionary: Treating your first attempt as a "practice run" to see what the exam looks like is a costly strategy. You pay the full exam fee each time you sit, and the data suggests retakers face tougher odds as a group.
If you are still building a plan, our RDMS study guide for passing on your first attempt lays out a preparation path, and our breakdown of RDMS certification cost shows why a failed attempt is expensive in both money and time.
Where the Points Live: Domain Weights and Pass Risk
Pass rates become actionable when you connect them to the exam blueprint. The official Abdomen Sonography Examination Content Outline (Version 24.1) divides the exam into four weighted domains. Where you concentrate your effort should follow the weights.
Domain 2: Pathology, Vascular Abnormalities, Trauma, and Postoperative Anatomy (42%)
This is the largest domain by a wide margin and the one where most candidates win or lose the exam. It rewards recognition of abnormal appearances, not just normal anatomy.
- Sonographic appearance and differentiating features of abdominal pathology
- Vascular abnormalities as they present in the abdomen
- Trauma findings, including what the sonographer is expected to recognize
- Postoperative anatomy, where normal landmarks have been altered
Domain 1: Anatomy, Perfusion, and Function (30%)
The second-largest block. It covers the normal baseline against which pathology is judged, including how organs are perfused and how they function.
- Normal sonographic anatomy and relationships
- Perfusion patterns and expected flow characteristics
- Organ function as it relates to what you image
Domain 4: Clinical Care, Practice, and Quality Assurance (20%)
One-fifth of the exam, and the domain most often underestimated by candidates who study only images and physics.
- Patient care and clinical practice considerations
- Quality assurance in sonographic practice
Domain 3: Abdominal Physics (8%)
The smallest domain, and the one that overlaps conceptually with the separate SPI exam. Do not skip it, but do not let it consume your study hours either.
- Physics concepts as applied to abdominal imaging
Add the weights and you get 100%: 30 + 42 + 8 + 20. The takeaway is that Domains 1 and 2 together account for 72% of the exam. A candidate comfortable with normal anatomy and fluent in abnormal appearances has most of the exam in hand. For the full breakdown of each content area, see our complete guide to the four RDMS exam domains.
The Format Factor: Image Hotspots and Scaled Scoring
Part of why this exam trips up capable candidates is its format. According to the current Inteleos exam page, the Abdomen exam runs approximately 165 questions over 3 hours and combines multiple-choice questions with image hotspot questions. Results are reported on a 300-700 scale, with 555 as the passing score.
Why image hotspots change the difficulty
A hotspot question asks you to interact with an image, for example by identifying a location or structure directly on a sonographic picture, rather than choosing from a list of typed answers. That tests applied recognition in a way a text description cannot. A candidate who has memorized the textbook description of a finding but rarely looked at real images may handle the multiple-choice items fine and still struggle when the picture is the question.
What the scaled score means
The 300-700 scale with a 555 passing mark means you are not simply counting raw percent-correct. Scaled scoring is a way of reporting performance on a consistent scale. For a closer look at the cut score and how to think about it, read our explainer on the RDMS passing score. For pacing, consider the arithmetic: roughly 165 questions in 3 hours leaves just over a minute per question on average, and image questions typically demand more of that time than quick recall items.
The SPI Dependency Behind the Abdomen Pass Rate
Here is a point many candidates miss when they quote a single pass rate: earning the RDMS (AB) credential requires passing both the Sonography Principles and Instrumentation (SPI) exam and the Abdomen (AB) exam. The SPI is a shared exam that serves as a requirement across sonography specialties, and it is separate from the abdomen specialty content.
That has two implications for how you interpret the published numbers:
- The abdomen pass rates describe the Abdomen exam only. They say nothing about how many candidates complete the full credential path.
- Your real-world probability of earning the credential depends on succeeding at two exams, so planning for one while neglecting the other is a common and avoidable mistake.
Abdominal Physics at 8% of the Abdomen exam is a small slice precisely because the broad physics and instrumentation foundation is tested in SPI. Review our RDMS requirements and eligibility guide to confirm how the prerequisite pathway applies to your situation, and check RDMS exam dates and scheduling to sequence your two sittings sensibly.
A Domain-Weighted Plan Built Around the Numbers
If the pass-rate data tells us anything actionable, it is that first-attempt preparation matters and that the exam rewards weighted, image-aware study. Here is one way to allocate an eight-week window around the actual domain weights. Adjust the pacing to your own schedule and baseline.
Domain 1: Anatomy, Perfusion, and Function
- Rebuild the normal baseline: organ relationships, normal appearances, expected flow
- Review real normal images so abnormal findings stand out later
Domain 2: Pathology, Vascular Abnormalities, Trauma, and Postoperative Anatomy
- Give this three weeks because it carries 42% of the exam
- Work through abnormal appearances by organ system, then vascular, trauma, and postoperative cases
- Practice with image-based review, not text alone
Domain 4: Clinical Care, Practice, and Quality Assurance
- Cover the 20% that candidates tend to skimp on
Domain 3: Abdominal Physics and SPI overlap
- Review the 8% domain and reinforce shared SPI concepts
Mixed practice and pacing
- Simulate the roughly 165-question, 3-hour format
- Revisit weak areas identified during Weeks 1-7
The logic is deliberately tied to the blueprint: Domain 1 first because it supplies the normal reference for everything in Domain 2, then the heaviest block with the most time, then the lighter domains. A condensed refresher for the final days is available in our RDMS cheat sheet, and you can test yourself under timed conditions with the RDMS practice tests on our main site.
Key Takeaway
Because Domain 2 is 42% of the exam and relies on recognizing abnormal appearances, spend your best study hours there, and pair question practice with real image review to cover the hotspot format that a text-only question bank cannot reproduce.
What a Pass Unlocks
The reason to care about pass rates is ultimately what the credential does for your career. The RDMS (AB) designation is issued through ARDMS and recognized by employers hiring abdominal sonographers in hospitals, imaging centers, and outpatient practices. Holding the credential is commonly a baseline expectation for abdominal scanning roles, and it signals that you have passed a standardized, weighted assessment of anatomy, pathology, physics, and clinical practice.
We deliberately do not attach salary or pass-probability figures here, because we only cite numbers we can verify. For the earnings picture, see our RDMS salary guide, and for the bigger question of whether the investment pays off, our analysis of whether RDMS certification is worth it. If you are still orienting yourself to the credential itself, start with what RDMS is.
Frequently Asked Questions
Inteleos publishes historical figures on its Abdomen exam page. In 2023, the first-time pass rate was 72% and the overall pass rate was 64%. In 2022, first-time was 69% and overall was 61%. These are the figures we rely on; verify current numbers directly on the Inteleos exam page.
The overall rate includes every attempt, including candidates retaking after an earlier unsuccessful try. Because repeat testers as a group tend to pass at lower rates, they pull the blended overall figure below the first-time figure.
According to the current Inteleos exam page, results are reported on a 300-700 scale and the passing score is 555. The exam is approximately 165 questions over 3 hours, with multiple-choice and image hotspot questions, and the exam fee is $300 USD.
Yes. Earning the RDMS (AB) credential requires passing both the SPI exam and the Abdomen exam. The abdomen pass rates describe the Abdomen exam only, so your path to the credential involves two successful exams.
Domain 2, Pathology, Vascular Abnormalities, Trauma, and Postoperative Anatomy, is the largest at 42%. Combined with Domain 1 (30%), it accounts for 72% of the exam. Prioritize these two, and include real image review because the exam uses image hotspot questions.