CDR DTR common mistakes
CDR DTR · Understand the traps and how to avoid them.
When computing the percentage of calories from fat in a 24-hour recall, the candidate divides fat grams by total grams of food (or divides fat grams by total kcal) instead of converting fat grams to kilocalories first, and picks an answer that is roughly double or half the correct value.
'Percent fat' is memorized as a single step, and under time pressure the candidate reuses the percent-of-weight procedure from math class rather than remembering that fat yields 9 kcal/g while carbohydrate and protein yield 4 kcal/g.
What to do instead
Force the three-line setup on scratch paper every time: fat grams × 9 = fat kcal; carbohydrate grams × 4 + protein grams × 4 + fat kcal = total kcal; fat kcal ÷ total kcal = proportion. Sanity-check by noting that fat's kcal number should be more than twice its gram number.
On a nitrogen balance item, the candidate divides protein intake by 6.25 correctly but then subtracts only the measured urinary urea nitrogen, omitting the obligatory ~4 g/day of insensible and fecal nitrogen loss, so the client is called in positive balance when they are actually in negative balance.
The candidate remembers the 6.25 conversion factor because it is numeric and memorable, but treats the +4 g constant as an optional add-on rather than a fixed part of the equation.
What to do instead
Memorize the whole equation as one chunk, e.g., 'intake ÷ 6.25, minus urine urea N, minus 4.' Work three practice cases where the 4 g flips the sign of the balance, and check that any answer showing positive balance differs from the raw subtraction by about 4 g.
When calculating ideal or desirable body weight, the candidate applies 2.3 kg per inch starting from zero inches, or applies the male base weight to a female client, producing an IBW several kilograms off and propagating the error into the protein or fluid requirement.
The two-part structure of the formula (a fixed allowance for the first 5 feet plus a per-inch allowance) collapses into a single remembered number, and the sex-specific base weights (about 45.5 kg for women, 48.2 kg for men) are recalled as interchangeable.
What to do instead
Write the formula out in full each time before substituting: base weight for first 5 feet (sex-specific) + 2.3 kg for each inch over 5 feet. Anchor it with a memorized reference case (a 5-foot-0 female = 45.5 kg) and verify your answer is above that floor.
The candidate converts body weight in pounds to kilograms by multiplying by 2.2 instead of dividing, or drops the conversion entirely and multiplies a grams-per-kilogram protein or fluid requirement by the pound figure, then selects the largest, most 'generous' option on the list.
2.2 is remembered as 'the number you use for pounds and kilograms' without the direction being attached, and large computed answers feel clinically plausible, so nothing triggers a check.
What to do instead
Attach direction to the number verbally: 'kilograms are heavier, so the kilogram number is smaller.' Estimate first (a 180-lb client is a bit over 80 kg) and reject any answer that is not in that neighborhood before doing exact math.
The candidate identifies the correct nutrition diagnosis and then selects a nutrition intervention as the answer to a stem asking what should be done first, or selects an assessment activity for a stem that is describing monitoring and evaluation.
The candidate reads the clinical scenario and reacts to the disease state and the most familiar intervention, skipping the step of classifying which of the four Nutrition Care Process steps the question is actually testing.
What to do instead
Before looking at the options, write one word on scratch paper naming the NCP step the stem implies (assessment, diagnosis, intervention, monitoring/evaluation) and eliminate any option belonging to a different step. Treat 'first', 'initial', 'priority', and 'next' as explicit cues to the sequence.
In enteral feeding calculations, the candidate treats milliliters of water added for dilution as if it supplied calories, or forgets that free water from the formula counts toward the fluid goal and adds the full flush volume on top, overshooting the fluid prescription.
Water and formula are both measured in milliliters, so the units look interchangeable, and the formula's percent-free-water value is not top-of-mind during a timed exam.
What to do instead
Keep the two quantities physically separate on the page: one column for formula volume (the only source of kcal) and one column for water (dilution plus flushes, zero kcal). Subtract the formula's free water from the fluid goal before computing the flush.
The candidate answers a temperature-control item using 40 to 140 degrees Fahrenheit as the danger zone, or judges a food safe on temperature alone without considering how long it sat in that range.
Older study materials circulate widely and the round numbers 40 and 140 are easier to recall than the current 41 to 135 range, and time is treated as a separate topic rather than part of the same control.
What to do instead
Memorize the pair as one unit, '41 to 135 and two hours,' and rehearse it against cold holding (41 or below), hot holding (135 or above), and cooling (135 to 70 within two hours, then to 41 within four more). When an option cites a temperature, check whether the stem also gives a time you must use.
On a HACCP item, the candidate labels a cooking temperature as the critical control point itself, or orders verification before monitoring, or names a critical limit that is a monitoring procedure rather than a measurable boundary.
The seven principles are memorized as a list of words without a worked example, so the candidate cannot tell which noun belongs to which role when they appear in a scenario.
What to do instead
For each principle, hold one concrete anchor: hazard analysis, then CCP (the step), then critical limit (the number), then monitoring (who and how often), then corrective action, then verification, then recordkeeping. Practice by mapping a single cook-chill recipe step by step and labeling each item with its principle.
When computing staffing needs, the candidate calculates full-time equivalents by dividing total weekly labor hours by 8 instead of 40, or counts two 20-hour-per-week employees as 2.0 FTE, then chooses a headcount that is roughly five times too high or double the true FTE.
The candidate conflates 'hours in a workday' with 'hours in an FTE week' and treats headcount as interchangeable with FTE because both are described as 'staff.'
What to do instead
Define FTE once and reuse it: 1.0 FTE equals 40 paid hours per week. Convert every employee to hours, sum the hours, divide by 40, and then check whether the question asked for FTEs or for bodies scheduled, since those are different answers.
The candidate classifies salary, job security, and pleasant working conditions as motivators in a motivation-theory item, or reverses the order of needs in a hierarchy item, choosing the physiological need when the scenario describes a need for recognition.
Everyday intuition says pay motivates people, which conflicts with the two-factor theory the exam tests, and the candidate answers from intuition rather than from the model's own definitions.
What to do instead
Draw a two-column table from memory before the exam: motivators (achievement, recognition, responsibility, advancement, the work itself) versus hygiene factors (pay, policy, supervision, working conditions, security). For hierarchy items, identify the unmet need in the stem first and match it to the level rather than ranking needs abstractly.