The RDN (Registered Dietitian Nutritionist) is an allied-health certification awarded by CDR.
CDR publishes the official exam outline, eligibility rules and fees — see CDR's official page before you book.
In our 1070-card RDN deck the heaviest topics are Management (28%), Pathology (25%), Physiology (13%) — that is how this deck is weighted, not the official blueprint, so use it to plan practice and check CDR's exam outline for the real weighting. This guide shows where the material gets hardest, which topics to practise first, and a 5-step plan built on active recall.
Start with the free RDN practice test
20 mixed questions with answers — find your weak topics before you plan around them →
Based on the 1070 flashcards in our RDN deck. Use it to budget study time, then confirm the official blueprint with the certifying body below.
| Topic | Cards | Share of deck | Practice |
|---|---|---|---|
| Management | 300 | 28% | Free questions → |
| Pathology | 270 | 25% | Free questions → |
| Physiology | 140 | 13% | Free questions → |
| Basics | 110 | 10% | Free questions → |
| Procedures | 110 | 10% | Free questions → |
| Assessment | 70 | 7% | Free questions → |
| Pharmacology | 40 | 4% | in the full deck |
| Diagnostics | 30 | 3% | in the full deck |
Our RDN cards carry difficulty ratings. The spread tells you how much of the deck is quick recall versus genuinely demanding:
0
Easy cards
0% of deck
534
Medium cards
50% of deck
536
Hard cards
50% of deck
These are genuine cards from the heaviest-weighted topics above. Answer each one before you reveal it — that is what active recall means in practice.
Which disaccharide is composed of glucose and galactose, and what specific glycosidic linkage must be hydrolyzed for absorption?
Show answer →Lactose consists of glucose and galactose joined by a beta-1,4 glycosidic linkage. The enzyme lactase (beta-galactosidase) is required to hydrolyze this bond. CDR Tip: Beta-linkages are generally indigestible by human enzymes (e.g., cellulose), with lactose being the primary exception. Distinguish from Sucrose (alpha-1,2) and Maltose (alpha-1,4), which are hydrolyzed more easily.
When preparing a custard, a chef notices the mixture becomes lumpy and releases water (syneresis) after overheating. Which protein process has occurred beyond the initial unfolding of polypeptide chains?
Show answer →Coagulation. While denaturation is the physical unfolding of protein structures (secondary/tertiary) due to heat, acidity, or agitation, coagulation is the subsequent formation of new cross-links between denatured proteins, creating a solid mass. Over-coagulation squeezes out liquid, a process known as syneresis. CDR Exam Tip: Distinguish between denaturation (the process) and coagulation (the result). Denaturation is sometimes reversible, but coagulation in food is almost always irreversible.
Proteins are described as amphoteric substances in food systems. How does this functional role contribute to the stability of the food's pH?
Show answer →Buffering capacity. Because proteins contain both acidic (carboxyl, -COOH) and basic (amino, -NH2) functional groups, they can act as buffers by accepting H+ ions in acidic conditions or donating H+ ions in basic conditions. This resists changes in pH, which is critical for maintaining the structural integrity, enzymatic activity, and flavor profiles in various food systems and biological fluids.
Eligibility, fees, question counts and the current blueprint live on the official CDR site (linked below). Print the outline — it is the map for everything that follows.
These 3 topics alone account for roughly 66% of our 1070-card RDN deck. Time spent here pays off more than anywhere else.
Answer questions before flipping to the answer — that struggle is what builds retention. Start with the 30 free RDN cards, then work through the full deck one category at a time.
After a full pass, re-drill only the cards you missed. Small categories are quick wins — closing a weak topic can be an afternoon's work.
Our deck rates 536 cards as hard. If those feel comfortable in your final two weeks, you are studying above test level.
Put the plan into practice
Every topic in the table above, with progress tracking across devices.
One-time payment · less than 1¢ per card · 30-day money-back guarantee
Try 30 free RDN cards firstWeight your time toward the biggest topics: in our 1070-card RDN deck, Management has 300 cards (28%), Pathology has 270 cards (25%), Physiology has 140 cards (13%). Always cross-check against the official CDR exam outline.
Question counts, time limits and fees change — always confirm them in the official CDR handbook (linked on this page). For practice, our RDN deck has 1070 question-and-answer flashcards covering the listed topics.
Difficulty is personal, but our deck's ratings give a sense of the spread: 0 easy, 534 medium and 536 hard cards. If the hard cards feel manageable, you are in good shape.
Try the 30 free RDN flashcards — no sign-up needed. If the format works for you, the full 1070-card deck is a one-time $7.
Eligibility rules, fees, question counts and passing standards are set by the certifying body and change over time. Always confirm them at the source before you apply or schedule your exam — our flashcards are practice material, not the official handbook.