Registered Dietitian (RD) Exam Practice Test
Build your confidence for Registered Dietitian (RD) Exam. Practice the concepts, understand the answers, and strengthen your knowledge one question at a time.
Try a sample questionExam overview and details
The Registered Dietitian (RD) Exam, administered by the Commission on Dietetic Registration (CDR), is the culminating assessment required to earn the Registered Dietitian Nutritionist (RDN) credential. This rigorous, computer-based examination validates that a candidate possesses the entry-level knowledge and competencies necessary to practice safely and effectively as a dietetics professional. Successfully passing the RD Exam signifies mastery across five core domains: Principles of Dietetics, Nutrition Care for Individuals and Groups, Management of Food and Nutrition Programs and Services, Public Health and Community Nutrition, and Research and Evidence-Based Practice. Earning the RDN credential is a non-negotiable prerequisite for state licensure in most jurisdictions and is the definitive standard for professional recognition in clinical, community, foodservice management, research, and private practice settings. It demonstrates a commitment to evidence-based practice and a foundational understanding required to improve patient outcomes, manage complex nutrition services, and contribute to public health initiatives.
Sample Questions
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A patient with suspected refeeding syndrome after starting tube feeds has phosphorus 1.4 mg/dL, potassium 2.9 mEq/L, edema, and new weakness. The resident wants to advance to goal because calories are still below needs. What should the RDN recommend?
A hospital is choosing between a conventional trayline and a room-service model. Leadership is concerned about therapeutic diet accuracy, late trays, and patient satisfaction. Which planning step is most important before selecting equipment?
An RDN reviews a 2025 app that estimates energy intake from food photos. It performs well with packaged foods but poorly with mixed cultural dishes. Which implementation concern is most important?
A research abstract reports that a diet intervention lowered systolic blood pressure by 4 mm Hg with a 95 percent confidence interval of -7 to -1 mm Hg. The sample size is small but randomized. What is the best interpretation?
A patient with ALS has increasing meal fatigue, coughing, and 10 percent weight loss. The family wants to wait on gastrostomy until eating becomes impossible. What should the RDN discuss?
Career Opportunities & Salary
Exam insights and study advice
Achieving the RDN credential is a critical differentiator in the nutrition and dietetics field, signifying a validated standard of competence that is recognized by employers, healthcare institutions, and regulatory bodies. It is essential for obtaining state licensure, which is legally required to practice in most states and is a common prerequisite for reimbursement from insurance providers. This certification unlocks advanced career opportunities, enhances professional credibility, and is often mandatory for clinical positions in hospitals, long-term care facilities, and other healthcare environments. It represents a commitment to the highest standards of professional practice and is the cornerstone for career advancement, specialization, and leadership roles within the industry.
What this exam covers
Use the published domain weights to plan your study. Practice results do not predict your certification exam score.