- The Short Answer: What RTM Stands For
- Site Abbreviation vs. ARRT's Official Designation
- Who Issues the Credential and How It's Delivered
- Who Can Pursue It: The Postprimary Pathway
- What the Exam Actually Covers
- Question Format and Testing Rules
- Fees, Attempts, and Scoring
- Reading the 2025 Pass-Rate Data Correctly
- Keeping the Credential Active
- Sequencing Your Preparation by Domain
- Frequently Asked Questions
- RTM stands for Registered Technologist - Mammography, an ARRT postprimary credential for technologists already certified in Radiography.
- ARRT's official discipline name is Mammography (M); "RTM" is this site's assigned abbreviation, not ARRT's own designation.
- The exam has 145 questions (115 scored, 30 unscored pilot) and a passing scaled score of 75, not 75% correct.
- Procedures is the heaviest domain at 65 of 115 scored questions, split between anatomy/pathology (26) and positioning (39).
The Short Answer: What RTM Stands For
On this site, RTM means Registered Technologist - Mammography. It refers to the mammography credential awarded by the American Registry of Radiologic Technologists (ARRT) to radiologic technologists who have completed the postprimary pathway in mammography and passed the ARRT mammography examination.
The acronym is easy to confuse, because "RTM" is used as shorthand in many unrelated fields. Everything in this article, and everything on RTM Exam Prep, refers only to the ARRT mammography credential. If you are looking for the full picture beyond the acronym, our related explainers cover what RTM certification is, what RTM means in practice, and the meaning of RTM from a candidate's perspective.
Site Abbreviation vs. ARRT's Official Designation
This is a subtle point that many candidates miss. ARRT's official discipline name is Mammography (M). The abbreviation "RTM" is the shorthand used on this site for the credential. It is not ARRT's own discipline designation. If you need to know exactly how to list the credential after your name on a résumé, badge, or signature block, ARRT publishes the authoritative rules on its credential-designation page, and you should follow those rather than relying on informal abbreviations.
In everyday conversation, colleagues may say "she's mammo-certified" or "he holds the mammography credential." All of these point to the same thing: the ARRT postprimary mammography certification. For a deeper look at how the credential is described across the profession, see our overview of RTM certification and our page on what an RTM is.
Who Issues the Credential and How It's Delivered
The credential is issued by the American Registry of Radiologic Technologists (ARRT). The examination is delivered at Pearson VUE test centers as a computer-based exam. ARRT sets the content, eligibility rules, passing standard, and ongoing maintenance requirements; Pearson VUE handles the testing environment.
The controlling blueprint is the ARRT Mammography Examination Content Specifications (board approved July 2024, effective September 1, 2025). It defines what is tested and how many scored questions each category contains. That document, not any third-party summary, is the final word on exam content.
Who Can Pursue It: The Postprimary Pathway
Mammography is a postprimary credential. That means you cannot start here; you build on an existing ARRT credential. The core eligibility elements are:
- Current ARRT certification and registration in Radiography.
- Compliance with ARRT ethics requirements.
- 16 hours of structured education completed within the 24 months before you apply, with at least one credit in each major content category.
- Verified clinical experience completed within the corresponding 24-month eligibility window.
The Clinical Experience Requirements in Detail
What You Must Document
The clinical component is substantial and must be verified. Under the 2025 requirements, candidates must complete:
- MQSA compliance before performing any procedures that will count toward the requirements.
- Independent mammographic imaging of 75 patients, with no phantom or simulated substitutions.
- All nine prescribed quality-control activities at their required repetition counts.
- Review of at least 10 mammography cases with an MQSA-qualified interpreting physician.
- At least five elective procedures through observation, assistance, or participation.
There are logging rules that trip up careless candidates. A maximum of 16 mammographic procedures may be logged per day across mammograms, QC, image evaluation, and electives, and QC documentation is limited to one submission per day per test. You must be physically present for examinations and procedures, but your qualified clinical verifier does not have to directly observe the work and may verify remotely.
For the image evaluation component, ARRT allows a HIPAA-compliant virtual meeting with a remote interpreting physician while you review the same images on a local monitor, though in-person review is recommended. For the full eligibility checklist, see RTM requirements and how to qualify, and for background on preparing before you apply, see RTM training.
What the Exam Actually Covers
The exam is organized into three major content categories. These are the official examination categories, not study-guide chapter titles, and the issuer specifies how many of the 115 scored questions fall into each.
| Domain | Scored Questions (of 115) | Notes |
|---|---|---|
| Domain 1: Patient Care | 20 | Patient interaction, safety, and care-related responsibilities |
| Domain 2: Image Production | 30 | Technical factors, equipment, quality, and image evaluation |
| Domain 3: Procedures | 65 | Largest category: anatomy, physiology, and pathology (26) plus mammographic positioning and procedures (39) |
Notice that Procedures carries more than half of the scored items. Within it, positioning and procedures (39 questions) is the single largest subcategory, followed by anatomy, physiology, and pathology (26). A candidate who is comfortable in the exam room but weak on breast anatomy and pathology can still lose a meaningful number of points. We break each area down in our complete guide to the three RTM exam domains.
Concrete Topics Within Each Domain
Domain 1: Patient Care
Mammography is uniquely personal and sometimes anxiety-provoking for patients. Expect to demonstrate command of the human side of the work alongside the technical.
- Communicating with patients before, during, and after the exam
- Patient comfort, positioning tolerance, and safety
- Professional and ethical responsibilities in a screening and diagnostic setting
Domain 2: Image Production
This domain covers the technical quality of the image and the systems that produce it.
- Equipment operation and technical factors affecting image quality
- Quality control activities and what they are designed to catch
- Recognizing acceptable versus unacceptable images
Domain 3: Procedures
The core of the exam, where anatomy knowledge meets hands-on technique.
- Breast anatomy, physiology, and pathology relevant to imaging
- Standard and supplemental mammographic positioning
- Procedural decision-making when a routine approach does not work
Question Format and Testing Rules
The exam contains 145 total questions: 115 scored and 30 unscored pilot questions. You will not be told which are which, so treat every item as if it counts. You get 150 minutes of answering time, within a 170-minute appointment that also includes the tutorial, nondisclosure agreement, and survey.
- Format: Computer-based and primarily single-best-answer multiple choice, with possible alternative item formats and image-based questions. ARRT's handbook also describes multiple-response and ordered-response formats.
- Closed book: No reference materials.
- Calculators: Basic and scientific on-screen calculators are available, and Pearson can supply a basic four-function calculator on request. Personal calculators are prohibited.
- Navigation: You must answer each item before advancing, but you can flag questions and revisit your answers.
Key Takeaway
Because you cannot skip a question without answering it, make a best-guess selection and flag it. Then use your remaining time to return to flagged items, especially the image-based and multi-step ones that take longer.
For a candid look at how this format feels in practice, read how hard the RTM exam is, and for scheduling details see RTM exam dates and testing windows.
Fees, Attempts, and Scoring
| Item | Detail |
|---|---|
| Initial application | $225 USD |
| Examination reapplication | $200 USD |
| Annual renewal | $65, regardless of the number of ARRT credentials held |
| Attempt limit | Three attempts within three years of the opening of the initial examination window |
| Passing score | 75 on ARRT's 1-99 scaled-score range |
The most common misunderstanding is the passing score. A scaled score of 75 does not mean 75% correct. ARRT converts your raw performance onto a scaled range so that the standard stays consistent across different exam forms. You can explore this in detail in our guide to the RTM passing score, and see the full cost picture in the RTM certification cost breakdown. Fee amounts can change, so always confirm them on ARRT's current fee page before you apply.
Reading the 2025 Pass-Rate Data Correctly
ARRT's Annual Exam Report for 2025 contains two figures that are easy to mix up:
- The full-year first-attempt summary reports 91% passing (rounded) among 1,865 candidates, and spans the September blueprint change.
- The revised-exam first-time cohort, covering September 1 through December 31, 2025, had a 90.3% pass rate (n=567).
Pass rates are encouraging, but they reflect a population of already-certified technologists who have completed required education and clinical work. They are not a reason to skip preparation, particularly given the weight of the Procedures domain.
Keeping the Credential Active
Earning the credential is the beginning of an ongoing obligation. To maintain certification and registration you must:
- Renew annually for $65, regardless of how many ARRT credentials you hold.
- Stay in compliance with ARRT ethics requirements.
- Earn 24 approved CE credits per two-year biennium, counted per biennium and not per credential.
Credentials earned on or after January 1, 2011 also carry Continuing Qualifications Requirements (CQR) every 10 years: a professional profile, a structured self-assessment, and any prescribed CE. ARRT also permits you to accept the maximum CQR CE prescription instead of taking the self-assessment.
If you are weighing whether this ongoing commitment pays off, our analyses of whether the certification is worth it, RTM earnings, and RTM jobs can help you evaluate the career side of the decision. Employers that perform breast imaging, including hospitals, outpatient imaging centers, and breast health programs, are the natural places mammography-credentialed technologists work.
Sequencing Your Preparation by Domain
Rather than a generic study plan, sequence your preparation around where the points are. Because Procedures holds 65 of 115 scored questions, it deserves the longest runway and the most repetition. A sensible order puts the heaviest, most knowledge-dense material first so you have time to revisit it.
Procedures: Anatomy, Physiology, and Pathology
- Build your foundation in breast anatomy and relevant pathology (26 scored questions)
- Connect each finding to how it appears on an image
Procedures: Positioning and Procedures
- Drill standard and supplemental positioning (39 scored questions)
- Practice reasoning through what to change when a view is inadequate
Image Production
- Review technical factors, QC activities, and image-quality criteria (30 scored questions)
Patient Care and Full Review
- Cover patient communication, safety, and ethics (20 scored questions)
- Take timed practice sessions that mirror the 150-minute limit
For a full walkthrough, see our RTM study guide, and keep our RTM cheat sheet handy for last-minute review. When you are ready to test yourself under realistic conditions, try the RTM practice tests to find the areas that need more attention.
Frequently Asked Questions
On this site, RTM stands for Registered Technologist - Mammography. It refers to the ARRT postprimary credential in Mammography (M). See also our dedicated explainer.
No. ARRT's official discipline name is Mammography (M). RTM is the abbreviation this site uses. For how to list your credentials officially, follow ARRT's credential-designation guidance.
Yes. The postprimary pathway requires current ARRT certification and registration in Radiography, along with ethics compliance, 16 hours of structured education, and verified clinical experience.
No. The passing score is 75 on ARRT's 1-99 scaled-score range, which is not the same as 75% of questions answered correctly.
You have three examination attempts within three years of the opening of your initial examination window. Reapplication after an unsuccessful attempt costs $200.
Understanding what the acronym means is the first step. From there, the real work is meeting the education and clinical requirements, mastering the Procedures domain, and keeping your credential current through renewal and continuing education. Begin with the fundamentals above, then move to our practice test platform when you are ready to apply what you have learned.