RDN Registered Dietitian Nutritionist Examination Practice Test

Eligibility is granted by the Commission on Dietetic Registration (CDR) upon verification that you have: 1) Completed a bachelor's or higher degree from a regionally accredited university, 2) Completed coursework through an Accreditation Council for Education in Nutrition and Dietetics (ACEND)-accredited Didactic Program in Dietetics (DPD), and 3) Successfully finished an ACEND-accredited supervised practice program (Dietetic Internship, Individualized Supervised Practice Pathway, or a Coordinated Program). You must submit a Verification Statement from your program director to CDR to receive your Authorization to Test (ATT).

The exam is a computer-adaptive test (CAT) consisting of 125-145 scored questions, delivered over 3 hours. It is based on the CDR's Detailed Content Outline, which organizes questions into four primary domains: Principles of Dietetics (20%), Nutrition Care for Individuals and Groups (40%), Management of Food and Nutrition Programs and Services (22%), and Foodservice Systems (18%). Questions are application-focused, requiring you to analyze scenarios, interpret data, and make appropriate clinical or managerial decisions.

The RDN exam uses a scaled scoring system ranging from 1 to 50. The passing scaled score is 25. This is not a percentage. The computer-adaptive format adjusts question difficulty based on your performance; a correct answer leads to a more difficult subsequent question, while an incorrect answer leads to an easier one. Your final score is based on the difficulty level of the questions you answered correctly. A score report indicating 'Pass' or 'Fail' is provided immediately at the test center.

The 'RDN' is a legally protected credential with standardized education, supervised practice, examination, and continuing professional education requirements mandated by the CDR. In many states, only RDNs (and those with equivalent state licenses) can provide medical nutrition therapy. The title 'nutritionist' is largely unregulated and can be used by anyone, regardless of formal education or training. The RDN credential ensures a specific, verified level of expertise and accountability.

The most critical resource is the official CDR Registration Examination for Dietitians Handbook for Candidates and the Detailed Content Outline, which provides the exact blueprint for the exam. The CDR's Study Guide and online practice tests are highly recommended. Many candidates also utilize comprehensive review courses, textbooks from their DPD/internship (e.g., Krause's Food & the Nutrition Care Process), and form study groups with peers.