RDN-AP study guide
RDN-AP · Work through your exam, one topic at a time.
The Registered Dietitian Nutritionist Advanced Practice (RDN-AP) credential is a board certification for dietitians who already hold the RDN and want formal recognition of advanced, autonomous practice. It signals that a clinician can manage complex nutrition problems independently - interpreting ambiguous assessment data, designing and adjusting nutrition support, and making decisions in critically ill, multimorbid, pediatric, and post-surgical populations. The RDN-AP study guide has 9 sections and about 3,815 words.
01Advanced Clinical Nutrition Assessment and Diagnosis
Advanced assessment asks you to fuse anthropometrics, biochemical data, clinical findings, and dietary/functional history into a defensible nutrition diagnosis written as a PES statement (Problem, Etiology, Signs/Symptoms). This domain tests whether you can reason when one variable misleads you: a normal albumin during inflammation, a normal BMI in a sarcopenic older adult, or a 24-hour recall that misses binge-purge cycles.
479 words, about 2 min02Medical Nutrition Therapy in Complex and Critically Ill Patients
Critical care nutrition centers on timing, hemodynamics, and substrate dose rather than on reaching calculated goals quickly. The exam tests whether you can withhold, start, or advance feeding in shock, titrate protein through organ failure, and recognize when standard equations mislead.
419 words, about 2 min03Nutrition Support: Enteral and Parenteral Nutrition
This domain tests the mechanics of delivery: route selection, initiation and advancement, formula choice, access-device care, and the transition between enteral nutrition, parenteral nutrition, and oral intake. Answers hinge on whether the gut is usable and whether the patient is hemodynamically safe to feed.
434 words, about 2 min04Chronic Disease Management and Multimorbidity
This domain tests individualized, longitudinal care for people living with two or more chronic conditions, where single-disease guidelines conflict. The exam rewards you for prioritizing safety, self-management capacity, and drug-nutrient interactions over rigid targets.
383 words, about 2 min05Pediatric and Neonatal Advanced Nutrition Care
Pediatric nutrition is judged against growth trajectory, not a single weight. This domain tests intrauterine and postnatal growth interpretation, human milk fortification, parenteral nutrition in the very low birth weight infant, and disease-specific pediatric requirements.
459 words, about 2 min06Nutrition in Gastrointestinal, Hepatic, and Renal Disorders
This domain tests organ-specific nutrition logic: when to feed a diseased gut, how to avoid starving a cirrhotic patient, and how to counsel a dialysis patient without creating unnecessary restriction. In acute pancreatitis, early oral or enteral feeding within 24–48 hours shortens ileus and hospital stay; NPO is not therapeutic.
414 words, about 2 min07Oncology, Transplant, and Surgical Nutrition
This domain tests how you feed patients before, during, and after major physiologic insults, and when aggressive nutrition helps versus harms. It blends cancer cachexia, enhanced recovery pathways, transplant immunosuppression, and postoperative complications.
394 words, about 2 min08Evidence-Based Practice, Research, and Quality Improvement
This domain tests whether you can appraise a study, translate findings into practice, and measure whether your own service is performing. Expect questions framed as a clinical scenario plus a research or quality problem.
400 words, about 2 min09Interprofessional Leadership, Ethics, and Practice Management
This domain tests professional judgment in the spaces where clinical facts conflict with patient values, institutional constraints, and legal duties. Expect ethics scenarios, team conflict, payer questions, and questions about scope of practice.
433 words, about 2 min