RTN Certification

What This Credential Actually Is

On this site, "RTN" is shorthand for the Registered Technologist - Nuclear Medicine Technology credential. It is issued by the American Registry of Radiologic Technologists (ARRT), whose official name for the discipline is Nuclear Medicine Technology, abbreviated (N). RTN is the abbreviation we use at RTN Exam Prep; it is not ARRT's formal designation. That distinction matters because ARRT's credential is a different certification from the NMTCB's CNMT, even though both lead to nuclear medicine technologist roles. If you are comparing credentials, make sure you are looking at the ARRT version.

This credential is earned through ARRT's primary eligibility pathway, which ties the exam to completion of an accredited education program rather than to experience alone. If you want a plain-language orientation to the abbreviation itself, our explainers on what RTN is and what RTN stands for cover the naming in more detail.

Who Issues It and How the Exam Is Delivered

ARRT sets the eligibility rules, writes the content specifications and determines the passing standard. Pearson VUE delivers the examination at its test centers. In practice, you apply to ARRT, receive approval, and then schedule your appointment through Pearson VUE. For scheduling mechanics and windows, see our guide to RTN exam dates and deadlines.

Eligibility: Degree, Program and Competencies

Primary eligibility has three pillars, and all of them must be satisfied before you sit for the exam.

1. Education: an associate degree or higher from an ARRT-recognized accredited institution. The degree can be in any major, but it must be conferred before the examination.
2. Program: completion of an ARRT-verified nuclear medicine technology educational program, including its didactic coursework and clinical competencies.
3. Ethics: compliance with ARRT's ethics requirements.

A timing rule trips up some candidates: the degree must be earned and the application submitted no more than three years after you complete your program. That initial application deadline is separate from the three-year window for examination attempts, which we cover below. Our RTN requirements guide walks through eligibility in more depth.

Clinical Competency Requirements

The clinical portion is more structured than many candidates expect. The competency requirements include:

• Eight general patient-care activities, including CPR certification
• Five quality-control activities
• Twenty-five different diagnostic or therapeutic procedures

No more than five of the diagnostic or therapeutic procedures may be simulated. Your program director or a designee must verify clinical competency through in-person direct observation. Remote or virtual observation is not accepted. If you are still in your program, confirm early that your clinical sites document each competency in a way your director can verify.

Exam Format and Item Styles

The exam is computer-based and closed book. You will see 230 questions in total: 200 scored items and 30 unscored pilot questions. You cannot tell which are which, so treat every question as if it counts. You have 230 minutes of answering time, and the full appointment runs 250 minutes to account for the tutorial, nondisclosure agreement and survey.

What the Questions Look Like

Most items are single-best-answer multiple choice. ARRT's handbook also describes possible alternative formats, including multiple-response and ordered-response items, and image-based questions appear as well. Because you must answer each question before moving on, you cannot skip freely, but you can flag an item and return to it. A sensible habit is to commit to your best answer, flag anything uncertain, and use leftover time to revisit those flags.

Calculation fluency matters in a discipline built on decay, dose and activity. The exam uses both SI and conventional radiation units, so you should be comfortable converting between becquerels and curies and between sieverts and rem, and doing it quickly with the on-screen calculator. Because personal calculators are not allowed, practice with a basic and a scientific on-screen calculator rather than your own device.

The Four Content Categories

The exam is organized into four official major content categories. These come from the Nuclear Medicine Technology Examination Content Specifications (board approved January 2021, effective January 1, 2022), which control examinations through January 31, 2027. A separate 2027 specification takes effect February 1, 2027; do not blend it into your 2026 preparation. ARRT publishes the allocations as scored-question counts out of 200, and we keep them as counts here rather than converting to percentages.

For a category-by-category breakdown, see our complete guide to the four RTN content areas.

Scoring, Attempts and the 2025 Cut-Score Change

The passing score is 75 on ARRT's 1-99 scaled-score range. A scaled 75 is not the same as getting 75 percent of questions right; raw performance is converted to the scale so that the same level of competence earns the same score across different exam forms. Our passing score explainer goes further into how to read your result.

A revised examination cut-score standard took effect February 1, 2025. The reported passing score remains 75 scaled, but the underlying standard was updated, so older anecdotes about difficulty may not map neatly onto today's exam. You get three examination attempts within three years of the opening of your initial examination window.

In ARRT's Annual Exam Report for 2025, first-time candidates passed at 64.7 percent (n=439). That is a modest sample, and it describes one year, so treat it as context rather than prediction. We analyze it further in our pass rate breakdown and in how hard the exam really is.

Fees, Renewal and Continuing Qualifications

The initial application fee is $225 USD. If you need to retake, the examination reapplication fee is $200 USD. For the full picture of what a realistic budget looks like, see our certification cost breakdown.

What Maintenance Involves

Staying certified means three things on an ongoing basis: annual renewal, continued compliance with ethics requirements and 24 approved CE credits each two-year biennium. Those 24 credits are shared across all your ARRT credentials rather than multiplied by them.

Credentials earned on or after January 1, 2011 also carry Continuing Qualifications Requirements (CQR) every 10 years. CQR consists of a professional profile, a structured self-assessment and any prescribed CE. ARRT also lets you accept the maximum CQR CE prescription instead of taking the self-assessment, which is worth knowing if you would rather complete extra CE than sit the assessment.

Sequencing Your Preparation Around the Blueprint

Because the blueprint is so heavily weighted toward Procedures, your schedule should be too. Below is a sample ordering tied to the content specifications rather than to generic study habits. Adjust the length to your own runway; our RTN study guide offers a fuller plan, and a quick-reference cheat sheet is useful in the final days.

To pressure-test your readiness against realistic question styles, use the RTN practice tests and review explanations for every miss, not just the ones you got wrong.

Where the Credential Gets Used

Nuclear medicine technologists work wherever diagnostic and therapeutic radiopharmaceuticals are administered and imaged. That typically means hospital nuclear medicine departments, outpatient imaging centers, cardiology practices, oncology and PET facilities, and academic medical centers. Employers generally look for ARRT registration as a marker that you completed an accredited program and passed a standardized exam. If you are weighing the payoff, see our analysis of whether the certification is worth it, the salary guide and a look at RTN jobs.

Because Procedures dominates the exam and also dominates daily work, the topics you master for the test, from radiopharmaceutical handling to cardiac stress protocols, are the same ones supervisors expect you to perform independently soon after hire.

Frequently Asked Questions