RD Exam Content Outline 2026: CDR Domains and Weights
Every CDR RD domain, how much of the paper it is, what its questions ask you to do and the order to study it in, straight from the CDR outline.
- 4Domains
- 145Questions
- 180 minTime
- 45%Heaviest area
- $250Exam fee
Table of Contents
The outline at a glance
Commission on Dietetic Registration publishes the RD outline that every CDR RD question is written against (2022-2026 RD Test Specifications, effective January 1, 2022 through December 31, 2026 (approved by CDR September 14, 2020). Replaced by the 2027-2031 specifications on January 1, 2027.). This page turns that document into what you actually need before you study: how big each area is, what the questions in it ask you to do, and the order to learn it in.
- Domain II: Nutrition Care for Individuals and Groups~54 questions45%
- Domain I: Principles of Dietetics~25 questions21%
- Domain III: Management of Food and Nutrition Programs and Services~25 questions21%
- Domain IV: Foodservice Systems~16 questions13%
What each domain actually asks
The official outline describes what each area covers. Below is what the questions in it ask you to do, which is what decides how you should study it.
Domain II: Nutrition Care for Individuals and Groups
45%~54 itemsIt asks you to: The biggest domain: given a patient or community scenario, you work through the Nutrition Care Process - calculate needs, interpret labs and anthropometrics, choose the correct nutrition diagnosis, and select or adjust the intervention and monitoring plan.
- Nutrition screening and risk prioritization
- Nutrition assessment (dietary intake, anthropometrics, biochemical data, physical findings)
- Nutrition diagnosis (PES statements)
- Planning and intervention, including medical nutrition therapy and enteral/parenteral nutrition
- Monitoring and evaluation of outcomes
- Community and population-level nutrition care
Domain I: Principles of Dietetics
21%~25 itemsIt asks you to: Expect to apply the science behind food and nutrients (e.g., how a preparation method affects nutrient retention) and to pick the right education or counseling approach for a given client or group, plus interpret study designs and research findings.
- Food science and composition of food
- Principles of normal nutrition across the life span
- Anatomy, physiology, microbiology and biochemistry
- Social determinants of health
- Education plans, education theories and counseling techniques
- Healthcare and nutrition informatics (telehealth, EHR, nutrient analysis software)
- Research process, statistics and evidence grading (Evidence Analysis Library)
Domain III: Management of Food and Nutrition Programs and Services
21%~25 itemsIt asks you to: Questions put you in a manager's seat: interpret a budget or productivity figure, choose a staffing or disciplinary action, pick a quality-improvement step, or identify which regulation applies.
- Functions of management (planning, organizing, emergency preparedness)
- Human resource management
- Financial management and budgeting
- Marketing and public relations
- Quality management and regulatory compliance
Domain IV: Foodservice Systems
13%~16 itemsIt asks you to: Expect practical operations problems: modifying a master menu for a diet order, forecasting and recipe scaling, choosing a procurement method, and applying HACCP and sanitation rules to a scenario.
- Menu development and modification (patient/resident, commercial, non-commercial)
- Procurement, production, distribution and service
- Sanitation and food safety
- Equipment and facility planning
Study it in this order
Weight is the only honest guide to where your hours go. The areas that make up the first half of the paper are core; the next third is support; whatever is left is a quick win you review last, not skip.
| Domain | Weight | Items | Priority |
|---|---|---|---|
| Domain II: Nutrition Care for Individuals and Groups | 45% | ~54 | Core |
| Domain I: Principles of Dietetics | 21% | ~25 | Core |
| Domain III: Management of Food and Nutrition Programs and Services | 21% | ~25 | Support |
| Domain IV: Foodservice Systems | 13% | ~16 | Quick win |
Item counts are the weight applied to 120 scored questions and rounded, so treat them as approximate.
The outline that replaces this one
A new outline takes over January 1, 2027 - December 31, 2031 (approved by CDR June 25, 2025). If your test date falls after that, study to the new domains below instead.
| New domain | Weight |
|---|---|
| Domain I: Fundamentals of Dietetics Practice | 23% |
| Domain II: Community and Public Health Nutrition | 22% |
| Domain III: Human Nutrition and Medical Nutrition Therapy | 40% |
| Domain IV: Food Science and Food Systems | 15% |
How the exam is built
| Item | Detail |
|---|---|
| Questions | 145 |
| Scored questions | 120 |
| Unscored pretest items | 25 |
| Time | 180 minutes |
| Question types | Multiple choice, four answer options (computer adaptive) |
| Delivery | Computer-based at Pearson VUE test centers, by appointment, year-round. Appointment is 3.5 hours: 3 hours of testing, 20-minute tutorial, 10-minute post-exam survey. No remote/online proctoring option is described by CDR. |
| Passing standard | Scaled score; the exam is scored on a scale of 1-50 and the minimum scaled score to pass is 25. The number of correct answers needed to reach 25 varies by exam form. |
| Fee | $250 — Variable length: minimum 125 items (100 scored + 25 pretest), maximum 145 (120 scored + 25 pretest); total_items/scored_items above are the maximums. Fewer than 125 answered within 3 hours = failure. Optional test bundle: $350 total buys the first attempt plus a discounted retake voucher ($100 voucher). Exam fee is separate from Academy membership and CDR registration maintenance fees. |
| Retakes | After an unsuccessful attempt, candidates must reauthorize with CDR and pay the current exam fee; the retest appointment must be on or after day 46 (45-calendar-day wait). No limit on attempts while eligible. A one-time 45-day waiver is available only with an employer letter stating the pass is needed to retain employment. |
| Published pass rate | 83.9% (All registration pathways, pass within one year of first attempt (3,411 examinees, 2,863 passed); not a first-attempt rate, 2025) |
Where candidates lose marks
These are the places the outline and the real exam part ways, the parts of the outline candidates misjudge most often:
- Studying from an old outline: the 2017-2021 weights (25/40/21/14) still circulate in old handbooks and blogs; the 2022-2026 weights are 21/45/21/13, and a completely new 2027-2031 structure starts Jan 1, 2027.
- Underrating management and foodservice: Domains III and IV are 34% of the exam and form their own sub-score, so a clinical-only study plan can sink a strong MNT candidate.
- Treating it like a linear test: it is adaptive with no going back, so you cannot flag and return, and running out of the 3 hours before answering 125 questions is scored as a fail.
- Memorizing facts instead of applying them: items are comprehension or application level, so practice calculations (energy/protein needs, tube feeding rates, food cost, recipe yield) and Nutrition Care Process decisions.
- Reading into pretest items: 25 unscored pretest questions are indistinguishable from scored ones, so an oddly obscure question should not rattle you - answer and move on.
Turn the outline into practice
ExamCert AI has 1,500 RD exam practice questions with explanations, built around the same outline this page walks through. Work them by domain, find the weak area, and fix it before test day.
Practise RD exam on ExamCert AIHow to Become a Registered Dietitian in 2026FAQ
What are the domains on the RD exam in 2026?
Through December 31, 2026 the exam uses the 2022-2026 test specifications: Principles of Dietetics 21%, Nutrition Care for Individuals and Groups 45%, Management of Food and Nutrition Programs and Services 21%, and Foodservice Systems 13%. Starting January 1, 2027 CDR switches to a new four-domain outline.
How many questions are on the RD exam?
It is a computer adaptive exam of 125 to 145 multiple-choice questions: 100-120 scored plus 25 unscored pretest questions. You get 3 hours and must answer at least 125 questions for the exam to be scored.
What score do you need to pass the RD exam?
CDR reports results on a 1-50 scale and the passing scaled score is always 25. The number of correct answers needed to reach 25 varies from one exam form to another, so there is no fixed percentage.
What changes on the RD exam in 2027?
The 2027-2031 test specifications (approved June 2025) reorganize content into Fundamentals of Dietetics Practice 23%, Community and Public Health Nutrition 22%, Human Nutrition and Medical Nutrition Therapy 40%, and Food Science and Food Systems 15%. Community and public health nutrition becomes a standalone domain.
Sources
Figures on this page come from CDR and the other primary sources below:
- CDR - RD Exam Study Resources (test specifications, study outlines, handbook)
- CDR - 2022-2026 RD Test Specifications
- CDR - RD Study Outline 2022-2026
- CDR - 2027-2031 RD Test Specifications and Expanded Study Outline
- CDR - 2026 RD Exam Handbook for Candidates (April 2026)
- CDR - RD & DTR Exam FAQ 2025
- CDR - RD Exam Pass/Fail Statistics
- CDR - Summary by Registration Pathway, pass within one year of first attempt (2025)
- CDR - Graduate Degree Registration Eligibility Requirement
- CDR - RD Examination Eligibility Requirements
- CDR - Registration Maintenance Fees
- CDR - Newly Credentialed RDs and DTRs
- ACEND - FAQs About Types of ACEND Accredited Programs
- BLS Occupational Outlook Handbook - Dietitians and Nutritionists
Checked September 25, 2026. Fees, outlines and eligibility rules change — confirm with CDR before you book.