What Is RTBS Certification?

What the Credential Actually Is

RTBS, as used throughout this site, stands for Registered Technologist - Breast Sonography. It is a postprimary credential awarded by the American Registry of Radiologic Technologists (ARRT) to technologists who demonstrate competence in performing breast ultrasound. In ARRT's own catalog the credential appears as Breast Sonography, abbreviated BS. If you want the shorter definitional versions of this topic, see our pages on what RTBS is and what RTBS stands for.

"Postprimary" matters. You do not earn this credential as your first ARRT certification. You earn it after you already hold a qualifying primary or supporting credential, then add documented education, documented clinical experience, and a passing exam result. In practical terms, the credential tells a radiology department that a technologist has been tested specifically on breast ultrasound anatomy, physiology, technique, pathology recognition, and procedural support, not just on general sonography.

Three Credentials People Mix Up

Breast ultrasound is covered by more than one credential in the imaging world, and candidates regularly confuse them. Before you spend money on an application, make sure you are chasing the right one.

The practical consequence: the application rules, exam content specifications, fees, and renewal obligations discussed in this article apply to the ARRT Breast Sonography credential only. Do not apply facts from the ARDMS breast exam to your ARRT preparation, or the reverse. Our overview of RTBS certification keeps the same distinction front and center.

Who Can Sit for the Exam

ARRT requires a supporting-category credential before you can earn Breast Sonography. The acceptable routes are:

• Current ARRT Radiography certification plus ARRT Mammography; or
• Sonography, held through ARRT or ARDMS; or
• Vascular Sonography, held through ARRT or ARDMS.

The Vascular Sonography route is explicitly listed in the 2026 postprimary handbook's supporting-category table, and it is easy to overlook. A vascular sonographer who has never considered breast imaging may already satisfy this part of the requirement. The radiography route is the only one that stacks two credentials, so a radiographer without Mammography does not qualify on radiography alone.

Beyond the supporting credential, you must comply with ARRT's ethics requirements, including the disclosure rules that apply to every ARRT applicant. For the full eligibility walkthrough, our RTBS requirements guide goes deeper, and the authoritative source is always ARRT's breast sonography credential page.

The Education and Clinical Experience Requirements

Two documented-experience requirements separate this credential from a simple "pass the test" certification. Both must fall inside a qualifying 24-month window.

Structured education

You need 16 hours of structured education completed within the 24 months before you apply, with at least one credit in each major category of the content specifications. That last clause is the one candidates miss: you cannot satisfy it by collecting 16 hours of a single topic. Plan your coursework across Patient Care, Image Production, and Procedures so each category is represented.

Clinical experience

The clinical component requires you to independently perform 200 nonsimulated breast examinations and participate in at least 20 approved elective procedures. The counting rules are specific:

• Bilateral examinations count as two.
• No more than nine procedures may be logged per day.
• Scanning must be physically onsite.
• Each mandatory examination must be presented to the radiologist for final interpretation.

The nine-per-day cap and the onsite rule mean you cannot compress the experience into a few busy shifts or complete it remotely. Start your log early and verify every entry meets the criteria as you go, because reconstructing a log after the fact is where applicants run into trouble.

How the Exam Is Built and Delivered

The exam is delivered by computer at a Pearson VUE testing center. Here are the numbers that define the experience:

• 225 total questions, made up of 185 scored items and 40 unscored pilot items. You will not know which are which.
• 225 minutes of testing time. This is separate from the 245-minute appointment, which includes check-in and other administrative steps.
• Primarily one-best-answer multiple choice, with other handbook-permitted formats including multiple-response, sorting, and image or video items.
• Closed-book. You cannot bring a personal calculator, though test-center-supplied and on-screen calculator options are available.

Be careful with older or third-party claims about a three-hour exam; they do not match the current handbook's exam-length table. For a look at what this format means in difficulty terms, read how hard the RTBS exam is, and for scheduling logistics see RTBS exam dates and deadlines.

The image and video items deserve attention because breast ultrasound is a visual discipline. Expect to evaluate representative images, recognize artifacts, and judge technique from what is on screen, not only recall definitions. Practicing with images, as opposed to text-only flashcards, pays off. You can try this style of question on our RTBS practice test.

The Three Content Domains

ARRT's Breast Sonography Examination Content Specifications (board approved July 2025, effective September 1, 2026) divide the scored questions into three major categories. The counts below are the official scored-question allocations, so use them as the planning backbone for your preparation.

Add the three counts and you get 185, which matches the scored portion of the exam. Notice that Image Production alone accounts for more than half of the scored questions. A candidate who knows breast anatomy beautifully but is shaky on ultrasound physics and image optimization has a real problem. For a fuller walkthrough of each area, see the RTBS exam domains guide.

Scoring, Attempts, and Pass-Rate Context

ARRT reports results on a 1-99 scaled score, and the passing score is 75. This is a scaled score, not a percentage of questions answered correctly. Different exam forms can vary slightly in difficulty, and scaling keeps the standard consistent across forms. ARRT's Standard Setting Report for Breast Sonography, effective September 2026, gives a form-specific raw-score equivalent and a projected pass rate for that form; it does not establish one universal raw cutoff. Our passing score breakdown covers this in more depth.

On attempts: you are allowed three examination attempts within three years before requalification is required. It is three attempts in total within that window, not three per year. Because of this, treat your first attempt as the one that counts and prepare accordingly.

For historical context, ARRT's 2025 Annual Exam Report lists a first-time pass rate of 78.1% among 146 candidates for Breast Sonography. Keep two caveats in mind. First, the cohort is small, so one year's figure is a snapshot, not a trend. Second, that cohort predates the September 2026 content blueprint and passing-standard revision, so it should not be read as a prediction for current candidates. We discuss how to interpret numbers like this in our pass rate analysis.

Fees and Keeping the Credential Active

Exam costs

The doubled fee for ARDMS-based applicants is a notable detail if your supporting credential comes from that registry. A complete budget, including the cost of structured education, is in our certification cost breakdown.

Maintenance after you pass

• Annual registration renewal: $65, regardless of how many ARRT credentials you hold.
• Continuing education: ordinarily 24 approved CE credits per two-year biennium.
• Continuing Qualifications Requirements (CQR): credentials earned on or after January 1, 2011 require CQR every ten years.

Because the renewal fee does not multiply with additional ARRT credentials, adding Breast Sonography to an existing ARRT credential does not raise your annual registration cost. Confirm current details on ARRT's fee, CE, and CQR pages before you budget, since policies can be updated.

Where the Credential Gets Used

Breast Sonography technologists work wherever breast ultrasound is performed, which in practice means a handful of settings:

• Hospital imaging departments and breast centers, where ultrasound complements mammography and supports diagnostic workups
• Outpatient imaging centers with a dedicated women's imaging service line
• Radiology practices that staff multiple sites and want technologists able to cover breast exams
• Cancer centers and surgical breast programs, where sonographers help with targeted imaging and procedural support

The credential is most valuable to a technologist who already works in or near women's imaging, such as a mammographer adding ultrasound capability or a sonographer specializing in breast. It can help an employer verify competence when assigning breast-specific scans, and it can support a move into a breast-focused role. Whether it is worth the investment for your situation depends on your local market and goals, which we examine in our ROI analysis. For compensation context, see the salary guide, and for openings, our overview of RTBS jobs. We avoid quoting salary figures here because pay varies widely by region, employer, and prior credentials.

Sequencing Your Preparation by Domain

Rather than a generic schedule, let the exam's own weighting drive your order of study. Image Production is more than half the scored exam, so it deserves the longest runway and the earliest start.

This ordering keeps your heaviest material earliest, when your focus is highest, and saves the smallest domain for a quick consolidation. Pair the schedule with our RTBS study guide and keep the one-page cheat sheet handy for last-week review. Finish by running several full-length sets on the practice test platform so the pacing of 225 questions in 225 minutes feels familiar.

Frequently Asked Questions