What Is RTN Certification?

What RTN Certification Actually Is

On this site, RTN is shorthand for Registered Technologist - Nuclear Medicine Technology. It is the credential granted by the American Registry of Radiologic Technologists (ARRT) to nuclear medicine technologists who complete an approved education program, meet ethics requirements and pass the Nuclear Medicine Technology examination. ARRT's own designation for the discipline is simply Nuclear Medicine Technology, with the discipline letter (N). "RTN" is the abbreviation this site assigns to it, not an ARRT-published designation.

If you are looking for a broader orientation to the acronym itself, our explainers on what RTN is and what RTN stands for cover the naming question. This article focuses on the credential: who grants it, what it demands and how the exam is structured.

Nuclear medicine technologists prepare and administer radiopharmaceuticals, operate gamma cameras and PET and SPECT systems, and acquire images that show how organs and tissues function rather than only how they look. The certification signals that you can do that work safely and competently under a recognized national standard.

Who Issues It and How It Differs From Look-Alike Credentials

Nuclear medicine technologists in the United States can be credentialed through more than one body, and candidates sometimes confuse them. The RTN credential is issued by ARRT. A separate credential, the CNMT, is issued by the Nuclear Medicine Technology Certification Board (NMTCB). They are distinct certifications with their own applications, fees, content outlines and renewal rules. Nothing in this article applies to the NMTCB route, and you should not assume that a fact about one carries over to the other.

The acronym "RTN" is also used by unrelated credentials in other fields. This page concerns only the ARRT Nuclear Medicine Technology credential earned through ARRT's primary eligibility pathway. When you read an exam fee, a pass rate or a content outline, confirm it comes from ARRT's nuclear medicine materials before relying on it.

Eligibility: The Degree, the Program and the Competencies

ARRT's primary pathway has three pillars: education, ethics and examination. You cannot sit for the exam on experience alone. The full breakdown lives in our RTN requirements guide, but the essentials are these.

Education

• An associate degree or higher from an ARRT-recognized accredited institution. The degree may be in any major, but it must be conferred before you take the exam.
• Completion of an ARRT-verified nuclear medicine technology educational program, including its didactic coursework and clinical competencies.
• Compliance with ARRT's ethics requirements, which cover both conduct and a review of any violations.

Clinical competencies

The clinical component is specific and verifiable. Candidates must document:

• Eight general patient-care activities, including current CPR certification.
• Five quality-control activities.
• 25 different diagnostic and therapeutic procedures. No more than five of these may be simulated.

Your program director or designee must verify clinical competency through in-person direct observation. Remote or virtual observation is not accepted. If you are still choosing a program, ask how it documents competencies and who signs them off.

The timing rule that trips people up

You must earn the degree and submit your application no more than three years after completing your program. That initial application deadline is separate from the three-year window you get for exam attempts once you are approved. Mixing the two up is a common mistake, and our exam dates and deadlines guide walks through how they interact.

How the Exam Is Built and Delivered

The exam is computer-based and delivered at Pearson VUE test centers. Here is the structure at a glance.

The 30 unscored pilot questions are indistinguishable from scored ones, so treat every item as if it counts. ARRT uses pilot items to evaluate future questions, and you will not know which are which.

Navigation and calculators

You must answer each item before advancing, but you can flag a question and return to it later in the session. Basic and scientific on-screen calculators are available, and Pearson can supply a basic four-function calculator on request. Personal calculators are prohibited. Because the exam involves activity calculations, decay and dose math, practice with an on-screen calculator rather than the one you use at work.

For a sense of how demanding this is in practice, see our breakdown of how hard the RTN exam is.

The Four Content Categories and Where the Points Are

ARRT organizes the exam into four official major content categories. These are exam categories, not a recommended curriculum, so they describe what is tested rather than how to learn it. For examinations through January 31, 2027, the controlling document is the Nuclear Medicine Technology Examination Content Specifications (board approved January 2021, effective January 1, 2022). A separate 2027 content specification takes effect February 1, 2027, and this article does not blend it into the current scope.

These are question counts, not official percentages. Procedures accounts for most of the scored exam, which should shape how you spend your hours. A deeper walkthrough is available in our complete guide to all four content areas.

Reading the Procedures breakdown

Inside Procedures, the radiopharmaceutical sub-area is the single biggest block at 28 questions. Those items reward knowing what each agent is, how it is prepared and localized, and what its quality-control and dosing considerations are. Cardiac and endocrine/oncology follow at 25 each, so stress testing protocols, thyroid and parathyroid studies and PET oncology imaging deserve real attention. Our one-page cheat sheet condenses many of the facts that recur across these sub-areas.

Scoring, Attempts and the 2025 Cut-Score Change

ARRT reports results on a scaled score from 1 to 99, and a 75 is passing. That 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. You cannot calculate your result by dividing correct answers by 200. Our passing score guide explains how to interpret a score report.

Attempts and pass rate

You get three examination attempts within three years of the opening of your initial examination window. ARRT's Annual Exam Report for 2025 lists a 64.7% first-time pass rate for 2025, based on 439 first-time candidates. That sample is modest in size, so treat the figure as a snapshot rather than a guarantee. We discuss what the data does and does not tell you in our pass rate analysis.

Fees and Application Mechanics

The fee structure is straightforward, and the full picture is in our certification cost breakdown.

Always confirm current amounts on ARRT's fee page before you submit, since fees are set by ARRT and can change. After your application is approved, you schedule your appointment through Pearson VUE.

Sequencing Your Preparation Around the Domains

You do not need a generic study plan; you need one weighted to this exam's point distribution. Because Procedures holds 118 of 200 scored questions, it should consume most of your calendar, with the smaller categories folded in so they stay fresh. The sequence below is a sample, and you can adapt it to your timeline. For fuller planning, see the RTN study guide.

You can pressure-test this plan with our RTN practice tests, which let you see which sub-areas still cost you points.

Keeping the Credential Active

Certification does not end with the exam. To stay registered, you must:

• Renew annually, at $65 regardless of how many ARRT credentials you hold.
• Stay in compliance with ARRT's ethics requirements.
• Earn 24 approved continuing education credits per two-year biennium. This requirement is per biennium, not per credential.

Credentials earned on or after January 1, 2011 also require Continuing Qualifications Requirements (CQR) every 10 years. CQR involves a professional profile, a structured self-assessment and any prescribed CE. ARRT also allows you to accept the maximum CQR CE prescription instead of taking the self-assessment.

Where the Credential Leads

Nuclear medicine technologists work wherever diagnostic and therapeutic radiopharmaceuticals are used: hospital nuclear medicine departments, outpatient imaging centers, cardiology practices, oncology and PET centers, and academic medical centers. Employers commonly look for a recognized national credential alongside completion of an accredited program, and the ARRT registration is one of the established ways to show it. Our guides to RTN jobs and the RTN salary landscape look at hiring and pay in more detail, and our return-on-investment analysis weighs the cost against the career benefits.

Frequently Asked Questions

For a related overview of the credential's name and scope, see our pages on RTN certification and what RTN means, then put your knowledge to work with the full set of RTN practice questions.