Part of the expanding PassProfessor catalog: The Registration Examination for Dietitians, administered by the Commission on Dietetic Registration (CDR), is a computer-adaptive, variable-length examination of 125 to 145 multiple-choice questions taken in two and a half hours at Pearson VUE centers. Its four domains run from Principles of Dietetics at 21 percent to Nutrition Care at 45 percent. Scores are scaled from 1 to 50, and the minimum passing scaled score CDR publishes is 25. PassProfessor’s program is priced at $79 when enrollment opens.
This program is part of the expanding PassProfessor catalog — join the notify list and we’ll email you when enrollment opens.
The Registration Examination for Dietitians is the final, national gate on a long professional pathway – graduate education, accredited dietetics coursework and supervised practice all stand behind the candidate who sits it. The examination itself is unlike a fixed test: it is computer-adaptive and variable in length, selecting questions against your demonstrated competence until it can place you against the passing standard. PassProfessor’s Registered Dietitian program is in development as part of the expanding PassProfessor catalog, built on the test specifications CDR publishes at cdrnet.org, and organized domain by domain. The program will be priced at $79 when enrollment opens, and its card will appear on the Allied Health hub alongside the catalog’s other allied-health programs.
Which dietitian credential is this?
This page covers the Registered Dietitian credential – the RD, also styled Registered Dietitian Nutritionist (RDN), the two titles naming the same CDR credential – and its Registration Examination for Dietitians. Three clarifications. First, this is not the technician examination: CDR’s separate examination for Dietetic Technicians, Registered (DTR / NDTR) has its own specifications and is a different program. Second, the examination is the last step, not the whole pathway: eligibility is earned through graduate education, ACEND-accredited coursework and supervised practice before CDR authorizes you to test. Third, passing earns the national credential; where a state licenses dietitians, that licensure is the state’s separate act, built on the credential.
What will the program cover?
Practice mapped to the published outline, area by area. The program is being built on the certifying body’s own published content structure for this examination, organized around the areas the outline itself defines, as recorded in the table below. Preparation time lands where the examination itself puts the emphasis, instead of spreading evenly across ground the outline treats unevenly.
Results you can read by content area. Because practice will be organized by the outline’s areas, your results can be read area by area – a thin area shows while there is still time to repair it, instead of hiding inside an overall score.
Original questions, written from the outline outward. When the program opens, every question will be an original PassProfessor practice question written to the published outline and current authoritative sources for this field. None will be an actual examination item, a recalled item, or another provider’s material, and no question will ask you to recite a code, section number or citation – knowledge is tested, citations never are.
Timed practice at the real sitting’s shape. The program’s design includes sustained timed practice modeled on the recorded facts of the real sitting – its length and pace as set out in the fact table below – so pacing is trained rather than discovered on the day. That design is PassProfessor’s preparation choice; the real examination’s own facts stand in their own table.
The real exam at a glance
| Fact of record | Detail |
|---|---|
| Examination | Registration Examination for Dietitians |
| Administering body | Commission on Dietetic Registration (CDR), the credentialing agency of the Academy of Nutrition and Dietetics |
| Format | Computer-adaptive testing (CAT), computer-based at Pearson VUE test centers, year-round |
| Questions | Variable length: 125 minimum to 145 maximum – 100 to 120 scored questions plus 25 unscored pretest questions, which cannot be distinguished from scored questions |
| Time | 2 hours 30 minutes of testing within a 3-hour appointment (20-minute introductory tutorial and 10-minute post-examination survey included in the appointment) |
| Answering rule | Candidates must answer the current question before moving to the next; previous questions cannot be reviewed or changed. Fewer than 125 questions answered in the time allowed is scored as a failure, as inconclusive |
| Domains (test specifications, January 1, 2022 – December 31, 2026) | I. Principles of Dietetics 21% – II. Nutrition Care for Individuals and Groups 45% – III. Management of Food and Nutrition Programs and Services 21% – IV. Foodservice Systems 13% |
| Scoring | Scaled scores 1-50; the minimum scaled score required to pass is 25, as CDR publishes. The number of correct answers needed to reach 25 varies from one examination to another |
| Eligibility (summary) | Graduate degree (required for eligibility established on or after January 1, 2024) + ACEND-accredited dietetics coursework + ACEND-accredited supervised practice; CDR authorization to test is valid for one year |
| Specifications change | Updated CDR test specifications take effect January 1, 2027 (2027-2031 specifications) – see the guide’s pathway section |
| Program price | $79 (PassProfessor program price, when enrollment opens) |
How will practice map to the outline?
| Content area | Published weight / status |
|---|---|
| Domain I – Principles of Dietetics | 21% |
| Domain II – Nutrition Care for Individuals and Groups | 45% |
| Domain III – Management of Food and Nutrition Programs and Services | 21% |
| Domain IV – Foodservice Systems | 13% |
What does Principles of Dietetics cover? (21%)
The science and professional base: food, nutrition and supporting sciences; education, communication and technology; and research applications. This domain tests whether the candidate can read evidence, teach and communicate nutrition, and ground practice in the underlying food and nutrient science – the foundation the care domain then applies to patients.
How should you prepare for Principles of Dietetics? Survey the area early, note where your reasoning breaks down, and return with focused practice rather than rereading. The work here rewards applied judgment in realistic situations, so pair every block of reading with timed practice, then examine why each wrong option was wrong. Keep a running list of the distinctions this area tests most finely, and revisit the area in mixed practice before you test, so competence does not depend on knowing the topic in advance.
What does Nutrition Care for Individuals and Groups cover? (45%)
Nearly half the examination, and its clinical heart: the nutrition care process end to end – screening and assessment, diagnosis, planning and intervention, and monitoring and evaluation – applied to individuals and groups across conditions and settings. Questions are practice-related cases: the candidate selects assessments, frames diagnoses in the process’s own structure, and chooses interventions and monitoring as a practitioner would, in sequence.
How should you prepare for Nutrition Care for Individuals and Groups? Start with the area’s core decisions and work outward to its edge cases. Preparation should alternate short reading blocks with timed questions on the same material, because retrieval under time pressure is the skill the sitting itself demands. Log every miss by cause – knowledge gap, misread situation, or wrong priority – since each cause has a different repair, and lumping them together hides the pattern your next study block should attack.
What does Management of Food and Nutrition Programs and Services cover? (21%)
Running the service, not just the care: functions of management, human resource management, financial management, marketing and public relations, and quality management and regulatory compliance. The domain tests managerial judgment – budgets, staffing, quality systems and regulatory duties – in the settings where dietitians lead programs rather than patients.
How should you prepare for Management of Food and Nutrition Programs and Services? Treat this area as a set of decisions, not a set of facts: for each topic, ask what the practitioner must notice first, what must happen next, and what must never happen. Practise in timed blocks, review every error the same day, and return to the area after a gap of several days so that retention, not recognition, is what carries you.
What does Foodservice Systems cover? (13%)
The operation that feeds people at scale: menu development; procurement, production, distribution and service; sanitation and safety; and equipment and facility planning. It is the smallest domain and the most operational – food safety discipline, production flow and facility decisions, examined as applied systems knowledge rather than culinary technique.
How should you prepare for Foodservice Systems? Build a one-page map of this area before drilling it: its central concepts, its recurring traps, and the situations in which its rules change. Then work timed practice against that map, correcting the map whenever a question exposes a gap in it. Finish the area with mixed practice alongside earlier areas, so the knowledge has to be selected, not merely recalled.
How is the Registration Examination for Dietitians scored?
The examination is scored on a scale of 1 to 50, and the minimum scaled score required to pass is 25 – the passing standard CDR publishes, stated here exactly as CDR states it. The scaled score is not a count and not a percentage: CDR publishes that the number of questions a candidate must answer correctly to obtain a scaled score of 25 varies from one examination to another, because the computer-adaptive format administers questions of calibrated difficulty against your responses and evaluates your performance against the passing standard. A harder run of questions therefore needs fewer correct answers than an easier run; neither rewards nor penalizes the candidate for the form the adaptive engine assembled.
Who can sit the Registration Examination for Dietitians?
Candidates CDR has authorized, after the pathway is complete. In outline, as CDR publishes it: a graduate degree – the minimum degree requirement for candidates establishing eligibility on or after January 1, 2024 – together with dietetics coursework through a program accredited by the Accreditation Council for Education in Nutrition and Dietetics (ACEND), and completion of ACEND-accredited supervised practice. Your program director’s confirmation sets eligibility in motion; CDR’s authorization to test follows, is valid for one year, and the examination is then scheduled with Pearson VUE. A candidate who does not pass must reauthorize to test again; CDR’s candidate handbook sets the waiting period before retesting (46 days after an unsuccessful attempt, as the handbook publishes). Confirm your own pathway position with CDR, because eligibility is individual and the handbook governs.
How should you use this page while the program is in development?
- Join the notify list today. Enrollment is not open yet, and the notify list is how you hear the moment it is. While you wait, read the Registered Dietitian exam guide – it walks the outline area by area and lays out eligibility, scoring and study planning in full.
- Study from the official outline now. The published outline quoted on this page is the syllabus; organizing your reading by its areas and weights is useful work today, before any practice program opens.
- When the program opens, survey every area first. Early practice should touch each content area, so your first area-by-area picture of yourself is honest rather than flattering.
- Drill the area that costs you. Let results, not preferences, set the next block of study – outlines reward the candidate with no thin area.
- Finish with timed, mixed practice. Sit full timed practice at the real sitting’s pace, and test when your practice is consistently strong across areas.
Frequently asked questions
What is the Registration Examination for Dietitians? CDR’s national credentialing examination for the Registered Dietitian (RD / RDN) credential: a computer-adaptive, variable-length examination of 125 to 145 multiple-choice questions, administered year-round at Pearson VUE test centers to candidates CDR has authorized after the education and supervised-practice pathway.
What score do I need to pass? A scaled score of 25 on CDR’s scaled range of 1 to 50, as CDR publishes. The number of correct answers needed to reach 25 varies from one examination to another because the examination is computer-adaptive; 25 is not a count of questions and not a percentage.
How many questions are on the examination? Between 125 and 145: at minimum 100 scored questions plus 25 unscored pretest questions, at maximum 120 scored plus the same 25 pretest questions. The adaptive format decides your length against the passing standard; you must complete at least 125 questions or the attempt is scored as a failure.
Can I go back and change answers? No. On this examination you must answer the current question before moving to the next, and previous questions cannot be reviewed or changed – a rule of the computer-adaptive format that preparation should rehearse, not fight.
Who is eligible to take the examination? Candidates who have completed CDR’s pathway: a graduate degree (required for eligibility established on or after January 1, 2024), ACEND-accredited dietetics coursework, and ACEND-accredited supervised practice, with CDR’s authorization to test, which is valid for one year.
What is the largest domain? Nutrition Care for Individuals and Groups, at 45% of the examination under the 2022-2026 test specifications – the full nutrition care process from screening and assessment through monitoring and evaluation.
What does the PassProfessor program cost? $79, when enrollment opens. The program is in development as part of the expanding PassProfessor catalog; join the notify list and the launch email will carry the enrollment link.
Are these CDR’s actual examination questions? No. When this program opens, its questions will be original practice questions written by PassProfessor to CDR’s published test specifications. We never use actual examination items, recalled items, or another provider’s material.
When will enrollment open? The program is in development. Join the notify list on this page and we will email you when enrollment opens at the $79 program price.
Is the RD the same credential as the RDN? Yes – Registered Dietitian and Registered Dietitian Nutritionist are two titles for the same CDR credential, earned by passing this examination after the same pathway. The DTR / NDTR technician credential is a separate CDR credential with its own examination, and is not covered by this program.
Disclaimer
PassProfessor is an independent exam-preparation provider; this program is not endorsed by, affiliated with or sponsored by the Commission on Dietetic Registration (CDR) or the Academy of Nutrition and Dietetics. The credential name is used on this page as a factual reference to the credentialing body’s examination. This program is examination preparation only: examination details on this page are drawn from the official sources recorded in the companion guide and are current as of November 2026; CDR’s official publications govern if anything here differs from them. The credential is awarded by CDR alone when all of its eligibility and examination requirements are complete; this program confers no credential, registration or license.