What Is RTBS?

What RTBS Means on This Site

On this site, RTBS stands for Registered Technologist - Breast Sonography. In practice, it refers to the postprimary Breast Sonography credential awarded by the American Registry of Radiologic Technologists (ARRT). A technologist who passes the exam and meets the other requirements earns the right to use ARRT's registered technologist designation with the Breast Sonography (BS) credential after the name.

The word "postprimary" matters. A primary pathway is how someone first enters the ARRT system, typically through a radiography or sonography program. A postprimary credential is an additional specialty earned on top of a credential you already hold. Breast Sonography is exactly that: you do not start here. You arrive with an existing supporting credential, then demonstrate specialized competence in breast ultrasound.

If you are looking for shorter definitional answers to related questions, the site also covers what RTBS stands for, the meaning of the acronym, and what the certification involves. This article takes the wider view: what the credential is, how the exam works, who qualifies, and how to approach it.

Who Issues the Credential and How It Differs From Look-Alikes

The credential is issued by ARRT, and the exam is delivered by Pearson VUE at computer-based testing centers. The official exam objectives come from ARRT's Breast Sonography Examination Content Specifications, board approved in July 2025 and effective September 1, 2026.

Breast ultrasound credentials are easy to confuse, so it helps to separate the three that candidates most often mix up:

There is one point of overlap worth noting. ARDMS credentials can matter to an ARRT Breast Sonography candidate in two ways: an ARDMS sonography or vascular sonography credential can serve as the supporting credential, and the fee is different when you apply using an ARDMS supporting credential (covered below).

How the Exam Is Built: Format, Length, and Question Styles

The Breast Sonography exam is a Pearson VUE computer-based test taken at a testing center. Here is the structure:

• Total questions: 225, made up of 185 scored questions and 40 unscored pilot questions.
• Testing time: 225 minutes. This is distinct from the 245-minute appointment, which includes the administrative portions of the visit.
• Primary format: one-best-answer multiple choice.
• Other permitted formats: multiple-response, sorting, and image or video items, as allowed by the handbook.
• Closed book: no reference materials. You may not bring a personal calculator, but a test-center-supplied calculator and an on-screen calculator are available.

The unscored pilot questions are the detail candidates most often misunderstand. You cannot tell which items are pilots, so every question deserves your full effort. Forty of the 225 items are being evaluated for future use and do not count toward your score, but they look identical to scored items.

Be careful with claims you may see elsewhere about a three-hour exam. The handbook's exam-length table, not third-party summaries, is the authority on timing. For the practical experience of sitting the test, see how hard the RTBS exam is.

The Three Content Domains and Their Question Counts

ARRT organizes the exam into three major categories. The scored-question allocations are Patient Care 16, Image Production 105, and Procedures 64, which sum to the 185 scored items. Counts are the reliable way to read the blueprint; this article deliberately uses the counts rather than converting them to percentage weights. For a fuller treatment, see the complete guide to all three RTBS content areas.

Eligibility: Supporting Credentials, Education, and Clinical Experience

Because this is a postprimary credential, eligibility has several layers. The full breakdown lives in the RTBS requirements guide; here is the overview.

Supporting-category credential

You must hold a current credential in one of these supporting categories:

• Radiography plus Mammography (both are needed on this route)
• Sonography, through ARRT or ARDMS
• Vascular Sonography, through ARRT or ARDMS

The Vascular Sonography route is explicitly listed in the 2026 handbook's supporting-category table on printed page 6. Candidates sometimes overlook it, assuming only general sonography qualifies. It does not need to be a general sonography credential; a vascular sonographer is a recognized path in.

Ethics and structured education

You must also satisfy ARRT's ethics compliance requirements and complete 16 structured-education hours within the 24 months before you apply, with at least one credit in each major category of the content specifications. This is not a one-time lifetime requirement; the 24-month clock matters.

Clinical experience

Within the qualifying 24-month window, you must 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.

Fees, Scoring, and Attempt Limits

The fee structure is straightforward but has one wrinkle tied to your supporting credential. For the complete picture, see the RTBS certification cost breakdown.

The scaled score

The passing score is 75 on ARRT's 1-99 scaled-score system. This is the most commonly misread number in the entire process. A 75 does not mean you must answer 75% of questions correctly. Scaled scoring converts your raw performance into a standardized scale so that the same level of competence earns the same score across different exam forms, even if one form is slightly harder than another.

ARRT's Standard Setting Report for Breast Sonography, effective September 2026, gives a form-specific raw-score equivalent and a projected pass rate. That is not a universal raw cutoff you can memorize, and it is not an observed 2026 cohort result. Treat any claim of a single magic number of correct answers with suspicion. More on this in the RTBS passing score guide.

Attempt limits

You are permitted three examination attempts within three years before requalification is required. This is three attempts total across that window, not three attempts per year. That limit makes each attempt valuable, which is a strong argument for sitting the exam only when your practice results are consistently solid.

What the Pass-Rate Data Does and Does Not Tell You

ARRT's Annual Exam Report for 2025 lists a first-time pass rate of 78.1% among 146 candidates for Breast Sonography. That is useful context, but with an important caveat: that cohort predates the September 2026 blueprint and passing-standard revision. The 2025 figure describes how candidates performed on the earlier version of the exam, not the current one.

Two further limits apply. The cohort is small, so one year's number can shift noticeably. And a first-time pass rate describes first attempts only. Read it as a rough signal that the exam is passable for prepared candidates, not as a prediction of your own result. The RTBS pass rate analysis goes deeper on how to interpret it.

Keeping the Credential Active

Earning the credential is the first step. Maintaining it involves recurring obligations:

• Annual registration renewal: $65 per year, 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 is flat across credentials, adding Breast Sonography to an existing ARRT credential does not multiply your annual registration cost. Check ARRT's current CE and CQR pages for the exact rules that apply to you, since requirements can change.

Where Breast Sonography Credentialing Fits in Your Career

Breast sonographers work where breast imaging is performed: hospital imaging departments, outpatient radiology practices, dedicated breast imaging and women's health centers, and cancer centers. Employers in these settings value technologists who can document findings accurately and support the radiologist, including during elective and interventional procedures.

Whether the credential pays off depends on your local market, your current role, and your employer's preferences. Rather than quote figures that vary widely by region and setting, use the dedicated resources: the RTBS salary guide, the RTBS jobs overview, and the ROI analysis to weigh the investment against your own situation.

Sequencing Your Preparation Around the Blueprint

You do not need an elaborate method; you need to let the blueprint dictate your time. The allocation of scored questions tells you where points live. A sensible sequence for a multi-week plan:

The logic is that Image Production is both the largest domain and the foundation for reading images correctly in Procedures, so it goes first. Patient Care is compact enough to consolidate late without being forgotten. Use the RTBS study guide for a fuller plan and the one-page cheat sheet for last-week review.

Because the exam includes image and video items alongside standard multiple choice, practice with formats that mirror the real test rather than text-only flashcards. You can work through realistic questions on the RTBS Exam Prep practice test site, and scheduling details are covered in the exam dates guide.

Frequently Asked Questions