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Facts checked Nov 13, 2026

RD exam (RD/RDN): Registration Examination for Dietitians

The RD exam, formally the Registration Examination for Dietitians, is the single national test that stands between an accredited dietetics education and the right to call yourself a registered dietitian. It is a computer adaptive test of 125–145 questions sat at Pearson VUE sites, and the credential is then kept up with continuing education in cycles of 5 years.

Read against CDR: RD Exam Handbook for Candidates, April 2026 and 12 more documents listed under Sources · checked Nov 13, 2026

The registration exam in one table

FactDetailSource
Exam ownerCommission on Dietetic Registration (CDR), which credentials practitioners for the Academy of Nutrition and DieteticsRD Exam Handbook for Candidates [1][2]
CredentialRD, Registered Dietitian, or the optional RDN, Registered Dietitian Nutritionist, which has the same meaning. Both titles come from the same exam and the same registration; choosing RDN adds no fee or requirement.CDR: RDN credential FAQ [1][3]
Official exam nameRegistration Examination for DietitiansRD Exam Handbook for Candidates [1][2]
Certification vs. licenseA national registration, not a state license. States that license dietitians set their own rules, including any retest rules for licensure, so check with your state board as well.CDR: RDN credential FAQ [1][3]
Who can sitA graduate degree, ACEND-accredited coursework and ACEND-accredited supervised practice. The degree must come from a USDE-recognized accredited institution or be a foreign equivalent. ACEND is the Accreditation Council for Education in Nutrition and Dietetics.RD examination eligibility requirements [4][5]
Question formatComputer adaptive multiple choice: every question has four answer options, and you cannot skip a question or go back to one. Questions from all four domains are mixed together and test comprehension and application. An on-screen calculator is built in; a basic handheld one is available on request.RD Exam Handbook for Candidates [1]
Questions125 to 145 questions, depending on how the adaptive test runsRD Exam Handbook for Candidates [1]
Exam time3 hours of testing in a 3½-hour appointment. The extra half hour covers a 20-minute tutorial and a 10-minute survey. You can hide the clock. If you have answered fewer than 125 questions when the 3 hours run out, the exam is scored as a fail.RD Exam Handbook for Candidates [1]
Passing scoreA scaled score of 25 on a 1–50 scale. A 25 does not mean half the items right.RD Exam Handbook for Candidates [1]
First-time pass rate67.6% of first attempts passed in January–June 2026 (932 of 1,379). By pathway: coordinated programs 71.1%, dietetic internships 65.0%, graduate programs 74.3%, ISPP 52.6%. CDR's figures are as of August 20, 2026.RD first exam attempt [6]
Pass rate83.9% of candidates passed within one year of their first attempt (2,863 of 3,411, period ending 2025). By eligibility pathway: coordinated programs 85.7%, dietetic internships 83.2%, graduate programs (listed by CDR as FG Coordinated Graduate) 89.8%, foreign equivalency 87.0%, ISPP 69.7%, reciprocity 17.1%. In CDR's 2025 program data, 76 of 403 programs (19%) had a 100% first-time pass rate.RD pass rates within one year of first attempt [7][8]
Where you testMore than 250 Pearson VUE centers, in the US and some other countries, by appointment all year. The April 2026 handbook covers center testing only; it offers no remote option.RD Exam Handbook for Candidates [1][2]
Exam fee$250, paid by credit card when you book. The fee is separate from Academy membership dues and from the annual registration fee.RD Exam Handbook for Candidates [1]
Wait before a retake45 days between attempts, so the retake can be on day 46 or later. You reauthorize with CDR first and can book before the wait ends. A one-time waiver is possible with a letter from your employer saying you must pass sooner to keep your job.RD Exam Handbook for Candidates [1]
Retake limitNo limit if your exam eligibility was established before January 1, 2027; a lifetime limit of eight attempts if you establish eligibility on or after that date. CDR set the eight-attempt limit in May 2026. State licensure boards can have their own retest rules.RD exam overview [1][2]
Renewal cycleEvery 5 years. If you pass after June 2, your first cycle runs longer than five years.Professional Development Portfolio guide [9]
To renewA Professional Development Portfolio each cycle: a Learning Plan, an Activity Log with at least 75 CPEUs, including 1 in ethics or health equity, and a Self-AssessmentProfessional Development Portfolio guide [9]
Renewal or yearly fee$80, rising to $90 on June 1, 2027. CDR bills the fee every year, due August 31; a $50 late fee applies in September, and the credential lapses on October 1 if it is still unpaid. New RDs get their first notice about 72 hours after passing; unpaid, it takes a $50 late fee after 90 days, and registered status ends after 120 days.CDR: registration maintenance fees [10]
Content outlineNew test specifications apply to every exam from January 1, 2027 through December 31, 2031. CDR approved the 2027–2031 specifications on June 25, 2025.RD exam test specifications and study outline [2][11][12]

A saffron date marks a value that changes on a date its body has already set. For the scoring rules and the retake wait, see exam facts; the booking path and all CDR fees sit on the registration page.

Pass mark on the scaled range CDR handbook 2026[1]

Scaled result: it is neither a raw count nor a share of correct answers.

RD or RDN: one credential, two titles

Registered dietitian nutritionist is an optional version of the registered dietitian title with the same legal meaning. One exam and one registration stand behind both, so pick whichever you prefer on a badge or a signature; switching titles costs nothing. Neither is a state license, which some states require on top.

What the questions cover today

Every sitting through the end of 2026 draws on four domains. Nutrition Care for Individuals and Groups is the largest by far at 45%: screening, nutrition diagnosis, intervention and follow-up for patients and client groups. Principles of Dietetics and Management of Food and Nutrition Programs and Services take 21% each, and Foodservice Systems the remaining 13%. The study guide takes them one section at a time.

Share of scored questions under the 2022–2026 specifications.

DomainWhat it coversShare
Principles of DieteticsFood, Nutrition and Supporting Sciences; Education, Communication and Technology; Research Applications.21%
Nutrition Care for Individuals and GroupsScreening and Assessment; Diagnosis; Planning and Intervention; Monitoring and Evaluation.45%
Management of Food and Nutrition Programs and ServicesFunctions of Management; Human Resource Management; Financial Management; Marketing and Public Relations; Quality Management and Regulatory Compliance.21%
Foodservice SystemsMenu Development; Procurement, Production, Distribution, and Service; Sanitation and Safety; Equipment and Facility Planning.13%

A new outline from January 1, 2027

From January 1, 2027, every sitting is built on the 2027–2031 specifications. The material is regrouped more than replaced. Clinical nutrition remains the core as Human Nutrition and Medical Nutrition Therapy, at 40%, while community and public health nutrition gets its own domain at 22%. If you sit the exam by December 31, 2026, you still get the four domains above. The study guide's 2027 section shows where each current domain goes.

Jan 1, 2027 the outline changes

If you test on or after Jan 1, 20272027–2031 outline CDR test specs 2027–2031[11][12]

23%22%40%15%
  • 23%Fundamentals of Dietetics Practice
  • 22%Community and Public Health Nutrition new domain
  • 40%Human Nutrition and Medical Nutrition Therapy
  • 15%Food Science and Food Systems

Eligibility: degree, coursework, supervised practice

You need three things: a degree at the current minimum level, coursework accredited by ACEND (the Accreditation Council for Education in Nutrition and Dietetics), and ACEND-accredited supervised practice. The minimum today is a graduate degree (since 2024); the table shows the cutoff date for candidates who qualified with a bachelor's.

Which route fits depends on where you are starting:

  • Still choosing a school: a coordinated program (CP) or a graduate program (GP) includes the supervised practice, so you finish ready to apply for the exam. The didactic program (DPD) route needs a separate dietetic internship (DI) after the coursework.
  • Holding a doctorate without supervised practice: the Individualized Supervised Practice Pathway (ISPP) is the route designed for you.
  • Trained outside the US: your degree goes through a course-by-course evaluation and then a review by the director of an ACEND-accredited program; an International Coordinated Program combines both parts abroad.
  • Already registered as a dietitian in one of the four countries with a reciprocity agreement: you may qualify through reciprocity, with conditions that vary by country.

The full path from choosing a degree to a state license, and how the RD compares with other nutrition titles, is on the dietetics page.

FactDetailSource
Degree requiredA graduate degree for anyone establishing eligibility from January 1, 2024; CDR does not require one from people who established eligibility by December 31, 2023. Before 2024 the minimum was a bachelor's degree. The coursework and supervised practice rules did not change.2024 graduate degree requirement for registration eligibility [4][5]
Education routesFour US routes: a Didactic Program in Dietetics plus a Dietetic Internship (DPD + DI), a Coordinated Program (CP), a Graduate Program (GP), or a doctorate with an Individualized Supervised Practice Pathway (ISPP). CP and GP build supervised practice into the program; the ISPP route requires a doctoral degree.RD examination eligibility requirements [4]
Foreign degreesA course-by-course evaluation from an approved agency, then a review by the director of an ACEND-accredited DPD, GP or CP. International Coordinated Programs (ICP), based outside the US, combine the coursework with 1,000 or more hours of supervised practice and lead straight to exam eligibility.RD examination eligibility requirements [4]
ReciprocityReciprocity for dietitians registered in Canada, the Netherlands, the Philippines and Ireland. Dutch and Philippine registrants sit the dietitian or the technician exam depending on their highest degree. Irish applicants need a graduate degree and a verification statement from the Irish Nutrition and Dietetic Institute.RD examination eligibility requirements [4]
Ethics and confidentialityCandidates sign on to the Code of Ethics for the Profession of Dietetics and accept a non-disclosure agreement covering the exam contentRD Exam Handbook for Candidates [1]

Eligibility rules read on CDR's eligibility and graduate-degree pages, Nov 13, 2026.

Keeping the credential: portfolio, CPEUs and the yearly fee

Registration renews in cycles of 5 years, and you never sit the exam again to keep it. Each cycle you build a Professional Development Portfolio in three parts: a Learning Plan set at the start, an Activity Log of continuing professional education units (CPEUs), at least 75 of them with one or more in ethics or health equity, and a Self-Assessment at the end.

Separate from the portfolio, there is a yearly registration fee of $80, rising to $90 on June 1, 2027. Missing it lets the credential lapse even when your CPEUs are in order; the fee row in the table above has the deadlines.

Warm up with 4 questions, one per domain

4 questions 0 done · 0 agree with the key

Principles · 21%Question 1 of 4

What is the main purpose of the sodium nitrite added to cured ham?

Choose a letter. The key opens with a short note under each of the choices.

  1. Promoting Maillard browning during cookingCheck
    Maillard browning comes from reducing sugars and amino groups under dry heat; nitrite takes no part in it, and the cured pink color is a separate reaction.
  2. Lowering the sodium content of the hamCheck
    Sodium nitrite brings a little sodium of its own, so it cannot lower the sodium of the ham; reduced-sodium cures use salt substitutes instead.
  3. Inhibiting C. botulinum and fixing pink colorCheck
    Nitrite blocks the germination of Clostridium botulinum spores and binds myoglobin into the stable pink cured pigment, the two jobs it does in ham.
  4. Increasing water retention and the cooked yieldCheck
    Water binding and a higher cooked yield come from salt and added phosphates; nitrite is used at levels far too low to hold water.
Nutrition care · 45%Question 2 of 4

During a follow-up nutrition-focused physical exam, where should the dietitian look for loss of muscle?

  1. Triceps skinfoldCheck
    The triceps area is pinched to judge subcutaneous fat, so it answers a question about fat stores, not muscle.
  2. Temporal regionCheck
    The temporal region, over the temporalis muscle, is a standard NFPE site for muscle wasting; hollowing there signals lost muscle mass.
  3. Orbital fat padsCheck
    Hollow, dark circles under the eyes reflect loss of the orbital fat pads, which is a fat finding rather than a muscle finding.
  4. Buccal fat padsCheck
    Flattened cheeks point to depleted buccal fat pads, another subcutaneous fat site that is easy to mistake for facial muscle.
Foodservice · 13%Question 3 of 4

When writing a new cycle menu, which item category should the planner schedule first?

  1. EntréesCheck
    Entrées are the costliest items and set the color, texture, and flavor pattern of each meal, so the rest of the cycle is built around them.
  2. Starches and vegetablesCheck
    Starches and vegetables are chosen next to complement the entrée; planning them first can force mismatched or costly main dishes.
  3. DessertsCheck
    Desserts are among the last items planned, picked to balance a meal whose heavier parts are already fixed.
  4. SaladsCheck
    Salads are fitted in after the main plate to add color and contrast, so they follow the plan rather than lead it.
Management · 21%Question 4 of 4

A school food authority wants to credit a commercial breaded chicken product toward the meat/meat alternate component of a reimbursable lunch. Which documentation is required?

  1. The product's Nutrition Facts panel and ingredient listCheck
    The Nutrition Facts panel lists grams of protein, but it cannot show how much creditable meat is in a breaded product.
  2. The distributor's specification sheet and price quoteCheck
    A specification sheet and a quote describe the item for purchasing; neither is accepted as crediting documentation for a reimbursable meal.
  3. A certificate of analysis for protein content from the vendorCheck
    A protein analysis cannot separate meat from breading, binders, or nonmeat protein, so it does not establish a crediting amount.
  4. A Child Nutrition label or a product formulation statementCheck
    Only a CN label or a signed product formulation statement shows how many ounce equivalents of meat/meat alternate one serving supplies, which is what crediting needs.

Practice, study guide, exam facts and booking

Other credentials in dietetics and nutrition

  • CDCES Who qualifies, the old CDE name, and renewal from 2027

Queued in this field: CDM, CFPP, IBCLC, CNSC, BC-ADM, NDTR, CNS not on the site yet

Sources

  1. [1]CDR: RD Exam Handbook for Candidates, April 2026 (PDF) cdrnet.org · checked Nov 13, 2026
  2. [2]CDR: RD exam overview (attempt limit, Test Bundle Voucher) cdrnet.org · checked Nov 13, 2026
  3. [3]CDR: RDN credential FAQ cdrnet.org · checked Nov 13, 2026
  4. [4]CDR: RD examination eligibility requirements cdrnet.org · checked Nov 13, 2026
  5. [5]CDR: 2024 graduate degree requirement for registration eligibility cdrnet.org · checked Nov 13, 2026
  6. [6]CDR: RD first exam attempt, summary by registration eligibility pathway, January–June 2026 (PDF) cdrnet.org · checked Nov 13, 2026
  7. [7]CDR: RD pass rates within one year of first attempt, by eligibility pathway, period ending 2025 (PDF) cdrnet.org · checked Nov 13, 2026
  8. [8]CDR: first-time pass rate data in 2025 by program, 403 programs (PDF) cdrnet.org · checked Nov 13, 2026
  9. [9]CDR: Professional Development Portfolio guide cdrnet.org · checked Nov 13, 2026
  10. [10]CDR: registration maintenance fees cdrnet.org · checked Nov 13, 2026
  11. [11]CDR: RD exam test specifications and study outline, January 1, 2027 – December 31, 2031 (PDF) cdrnet.org · checked Nov 13, 2026
  12. [12]CDR: RD exam test specification comparison, 2022 vs. 2027 (PDF) cdrnet.org · checked Nov 13, 2026
  13. [13]CDR: RD exam test specifications, January 1, 2022 – December 31, 2026 (PDF) admin.cdrnet.org · checked Nov 13, 2026

If a figure here looks wrong

Before you apply for the RD exam

Is the RDN exam different from the RD exam?

No. There is one Registration Examination for Dietitians, and passing it lets you use either title. RDN was added as an option and carries the same meaning.

Is a graduate degree now required for the registered dietitian exam?

If you are establishing eligibility now, yes: the minimum is a graduate degree (since 2024), in addition to ACEND coursework and supervised practice. People who were already eligible before the rule took effect were not required to go back for one.

Does passing the exam license me to practice?

It gives you national registration, not a license. States that license dietitians run their own application and rules, so check with the licensing board of each state you plan to practice in.

How many CPEUs does a registered dietitian need?

At least 75 over each cycle of 5 years, logged in the Professional Development Portfolio, with at least one unit in ethics or health equity.