RTN Study Guide 2026: How to Pass on Your First Attempt

What You're Actually Studying For

This guide covers the ARRT examination in Nuclear Medicine Technology, which this site abbreviates as RTN. That distinction matters. The credential here is earned through the American Registry of Radiologic Technologists (ARRT) primary pathway. It is a separate credential from the NMTCB's CNMT, and the two exams have different content outlines, fees, and policies. Material written for one should not be treated as a substitute for the other.

If you are still orienting yourself on the terminology, our explainers on what RTN certification is and what RTN stands for cover the basics. This article assumes you are already committed and want a plan. For a broader look at the credential, see the RTN certification overview.

The ARRT reported that 64.7 percent of first-time candidates passed in 2025 (n=439). That figure comes from the ARRT Annual Exam Report - 2025, and it is worth reading as a sign that roughly a third of first-time candidates did not pass. We break down what that number does and does not tell you in our RTN pass rate analysis.

Eligibility Comes Before Studying

You cannot sit for the exam just because you have studied. Under the primary eligibility pathway, you need an associate degree or higher from an ARRT-recognized accredited institution, completion of an ARRT-verified nuclear medicine technology educational program with its didactic and clinical competencies, and compliance with ARRT ethics requirements. The degree can be in any major, but it must be conferred before you take the examination.

Money is part of the plan too. The initial application fee is $225, and each examination reapplication costs $200. Those numbers are one reason to treat your first attempt seriously. The full cost picture, including renewal, is in our RTN certification cost breakdown.

How the Exam Is Built and Delivered

The exam is computer-based and delivered at Pearson VUE test centers. You will see 230 questions in total: 200 scored and 30 unscored pilot questions. You cannot tell which are which, so treat every item as if it counts. You have 230 minutes of examination answering time, and the appointment runs about 250 minutes once you include the tutorial, nondisclosure agreement, and survey.

Two format details should shape how you practice. First, the calculator rule: nuclear medicine involves decay corrections, dose calculations, and unit conversions, and you will use the on-screen tools rather than your own. Practice with a similar on-screen calculator so the interface is not new on test day. Second, because you must answer every item before moving on, you cannot skip and return later without committing to an answer. Flagging lets you revisit, but you still need to select something first.

For a candid look at how these features combine into difficulty, read how hard the RTN exam is.

Why 75 Does Not Mean 75 Percent

The passing score is 75 on ARRT's 1-99 scaled-score range. It is not 75 percent correct. Scaled scoring adjusts for differences in difficulty between exam forms so that a given score represents the same level of performance regardless of which form you received. A revised examination cut-score standard took effect February 1, 2025, and the reported passing score remains 75 scaled.

The practical consequence: do not try to reverse-engineer a raw number of questions you can afford to miss. Stop planning around a percentage target and instead aim for consistent, broad competence across all four domains, with the strongest depth where the question counts are highest. Our RTN passing score guide explains scaled scoring in more detail.

Where the Points Live: The Four Domains

The ARRT organizes the exam into four major content categories. These are examination content categories, not chapters in a preparation curriculum, so your program's course sequence will not map neatly onto them. The controlling source for examinations through January 31, 2027 is the Nuclear Medicine Technology Examination Content Specifications (board approved January 2021, V.2021.02.24, effective January 1, 2022). The official scored-question allocations are below, expressed as question counts out of 200 rather than inferred percentages.

Procedures alone accounts for 118 of 200 scored questions, which is more than the other three domains combined. A candidate who is excellent at radiation safety and patient care but shaky on procedures is gambling with the exam. For a deeper look at each category, see the complete RTN exam domains guide.

Inside the Procedures Domain

Because Domain 4 is so heavy, the ARRT breaks it into five subcategories with their own scored-question counts. Study each as its own unit.

Notice that Radionuclides and Radiopharmaceuticals has the largest single count in this domain. It also underlies the others: you cannot reason about a cardiac or GI protocol without understanding the agent behind it. That makes it a sensible first priority within Procedures.

Safety and Image Production: Smaller but Dense

Do not let the smaller counts fool you. Safety (25 questions) and Image Production (33 questions) together are 58 scored items, and they are more concrete and calculation-friendly than much of the Procedures material. They can be reliable points if you prepare deliberately.

That CT boundary is a useful scope filter. If you find yourself deep in diagnostic CT protocol detail, you are likely studying beyond what this exam asks.

A Study Sequence Built Around the Domain Weights

This is the one place for a schedule, and it is tied directly to the question counts above. Adjust the length to your own timeline; the ordering logic is what matters. Procedures gets the majority of your hours because it holds 118 of 200 scored items, and Radionuclides and Radiopharmaceuticals goes first because everything else depends on it.

Use the timed practice in Week 8 diagnostically. If your misses cluster in one subcategory, spend your remaining days there rather than rereading material you already know. You can take domain-organized practice questions on our RTN practice test site, and our RTN cheat sheet works well as a final-week review of must-know facts.

Using Your Clinical Competencies as Study Material

Your clinical training is not just a requirement to clear; it is study material you have already lived. The Nuclear Medicine Technology Didactic and Clinical Competency Requirements call for eight general patient-care activities (including CPR certification), five quality-control activities, and 25 different diagnostic and therapeutic procedures. No more than five of those procedures may be simulated, and the program director or designee must verify clinical competency through in-person direct observation. Remote or virtual observation is not accepted.

The 25 procedures you performed map directly onto the Procedures domain, and your five quality-control activities map onto Image Production. The patient-care activities connect to Domain 1. When you review a topic, ask yourself whether you performed it clinically, and if so, recall what went wrong or nearly went wrong. Real cases stick in memory better than textbook lists. Conversely, any procedure you only simulated or rarely saw is a flag for extra book study, since you lack that clinical anchor.

If you are weighing training options or looking at where this credential can take you, our pages on RTN training and RTN jobs are good next reads.

Test-Day Mechanics

A few operational points reduce avoidable stress.

• Pace to the clock. With 230 questions in 230 minutes, you have roughly one minute per item. Procedures-heavy scenario questions may take longer, so bank time on quick recall items.
• Commit, then flag. Because you must answer before advancing, choose your best answer, flag it, and return if time allows.
• Treat unfamiliar items as normal. Thirty of your questions are unscored pilot items, so a few strange questions are expected and do not signal that you are failing.
• Use the on-screen calculator deliberately. For decay and dose problems, set up the equation on your note surface first, then calculate. If you prefer a basic four-function calculator, request one from Pearson rather than bringing your own.
• Expect image-based and alternative formats. Practice multiple-response and ordered-response questions so the format does not cost you attention.

After You Pass: Renewal and CQR

Earning the credential is the start of a maintenance cycle. You maintain certification and registration through annual renewal at $65, regardless of how many ARRT credentials you hold, plus continuing compliance with ethics requirements. You also need 24 approved continuing education credits per two-year biennium; those credits are counted 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 permits accepting the maximum CQR CE prescription instead of taking the self-assessment. For the financial and career side of the decision, see the RTN salary guide and our analysis of whether the RTN certification is worth it.

Frequently Asked Questions