CDR RD common mistakes
CDR RD · Understand the traps and how to avoid them.
Treating the RDA as the answer for every DRI question - using it to estimate the prevalence of inadequacy in a group, or comparing one 24-hour recall against it to declare a client deficient.
Candidates memorize 'RDA = the goal' early and never re-anchor which reference value belongs to assessment versus planning, so all four DRI terms collapse into one.
What to do instead
Build a four-line use-map and drill it until automatic: EAR = assessing prevalence of inadequacy in groups and planning for populations; RDA = intake goal for an individual; AI = used when no EAR exists, cannot be used for prevalence estimates; UL = risk of excessive intake. Add the rule that usual intake, not a single day, is compared against any DRI.
Applying adult reference standards to a pediatric, pregnant, or older adult client - adult BMI cut-points for a school-age child, or generic 30 kcal/kg for a woman in the second trimester.
Adult clinical norms are rehearsed most often in practice and study, and the stem's population descriptor blends into the background when the case looks otherwise routine.
What to do instead
When a client's age or obstetric status appears in the stem, halt and name the population-specific tool before looking at answers: BMI-for-age percentile (not adult BMI) for clients under 20; pregnancy adds roughly 340 kcal/day in the second and 450 kcal/day in the third trimester plus about 25 g/day protein; lactation and pediatric energy/protein needs scale with age and growth velocity, not with adult kg-based ranges.
Choosing an intervention option on a question that asks what the dietitian should do first or next, skipping assessment or diagnosis entirely.
Clinical reflex jumps straight to the fix; the words 'first' and 'next' are short and easy to skim past, and intervention answers read as the most competent-sounding choice.
What to do instead
For every 'first/next/initial' stem, silently place each option into the Nutrition Care Process sequence (Assess, Diagnose, Intervene, Monitor/Evaluate). Only the option filling the earliest unmet step can be correct. If a client has not yet been assessed for the problem in question, no intervention option can be first.
Selecting a PES statement whose problem is actually an intervention, a medical diagnosis, or a lab value, or whose etiology is not something the dietitian can address.
Candidates write the statement the way they would chart a note, using the disease ('diabetes mellitus') or the plan ('needs carbohydrate counting education') as the problem, because that is how the case is framed in the stem.
What to do instead
Run three checks on every candidate PES: the P must be an approved nutrition diagnosis term from the intake, clinical, or behavioral-environmental domain (e.g., 'excessive carbohydrate intake,' 'altered nutrition-related laboratory values'); the E must be a contributing risk factor the dietitian can act on; the S must come from assessment data. Reject any statement where the E is only a medical diagnosis with no modifiable nutrition link, or where the problem is really the intervention.
Assigning nutrition screening to the dietitian, or assigning nutrition assessment to unlicensed assistive staff - mixing the two terms when a scope-of-practice item turns on that distinction.
In day-to-day practice the words are used interchangeably, so candidates answer from the habit of their facility rather than from the definitions the exam is testing.
What to do instead
Lock the definitions: screening is a brief process to identify who is at risk or needs further evaluation and may be completed by trained staff such as technicians or nurses using a validated tool; assessment is the dietitian's interpretation of data to reach a nutrition diagnosis. If a question hinges on who may perform the task, answer from these definitions, not from local practice.
Running clinical calculations with generic constants - using 4 kcal/g for dextrose in parenteral nutrition, treating a 20% lipid emulsion as 9 kcal/g, or forgetting to check the answer against a plausible range.
The 4/4/9 carbohydrate/protein/fat rules are overlearned and get applied to substrates where they are wrong, and time pressure removes the habit of a sanity check.
What to do instead
Write the constants on scratch paper before starting: dextrose 3.4 kcal/g, amino acids 4 kcal/g, 20% lipid emulsion 2 kcal/mL (10 kcal/g lipid), alcohol 7 kcal/g. After any enteral or parenteral calculation, verify total kcal against 25-35 kcal/kg, protein against 1.0-1.5 g/kg, and check that the free-water volume from formula plus flushes is consistent with the fluid order.
Offering an action-oriented plan to a client described as having no intention of changing, or giving one-on-one education when the question describes a population-level or policy-level problem.
The default professional reflex is to teach and prescribe, and the stem's cues about readiness or level of intervention are subtle next to the vivid details of the case.
What to do instead
Name two things before reading options: the client's stage of change and the level of the intervention (individual, interpersonal, community, policy). Match strategy to stage - precontemplation calls for raising awareness and building rapport, not goal-setting; contemplation calls for exploring ambivalence. Match the level too: a question about a community's access problem is answered with environment, policy, or systems strategies, not a handout.
On management items, choosing the answer that avoids conflict or preserves harmony - skipping steps in progressive discipline, doing a subordinate's task instead of delegating, or siding with the popular employee.
Workplace instinct and likability bias push toward the least confrontational option, and the correct answer often requires a formally correct but uncomfortable action.
What to do instead
Answer management items from structure, not feeling. Recall the standard progressive discipline sequence and the principle that documentation precedes action at each step. For delegation, the delegator retains accountability. For motivation items, match theory to the described need (lower-order needs before higher-order; hygiene factors prevent dissatisfaction but do not motivate). Ask: what would a policy manual or arbitrator uphold?
Computing productivity or budget figures with the wrong base - dividing meals by total paid hours instead of productive hours for meals per labor hour, or misreading the sign on a budget variance.
The formulas are short and similar, and the direction convention (favorable versus unfavorable variance) is easy to invert under time pressure, especially for revenue versus expense lines.
What to do instead
Write the definitions before calculating: meals per labor hour equals meals served divided by productive (worked) labor hours, excluding benefit and vacation time; FTEs equal total hours worked divided by 40 (or by the facility's full-time standard). For variances, state in words whether the item is revenue or expense and whether the actual came in above or below budget before assigning favorable or unfavorable.
Matching a foodservice operation to the wrong production system - labeling a cook-chill operation conventional because food is cooked on site, or calling a central kitchen with satellite service conventional because it produces its own food.
The system names overlap with ordinary descriptions of what happens in a kitchen, so candidates pattern-match on 'food is cooked here' rather than on the defining variable, which is the time and distance between production and service.
What to do instead
Classify by the gap between production and service, and by equipment: conventional means production and service are close in time and place with little need for long holding; commissary or central production means a single production site supplies satellite units, requiring bulk transport; ready-prepared means food is produced, then held chilled or frozen for later service (cook-chill, cook-freeze, sous vide). Identify the time gap first, then assign the label.