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RDN-AP practice questions

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Question 1Advanced Clinical Nutrition Assessment and Diagnosis

A patient's 24-hour urine urea nitrogen is 12 g, and the dietitian calculates 4 g of non-urea nitrogen loss. Using the standard formula, what is the approximate total urinary nitrogen loss?

  1. 16 g Correct answer.
  2. 8 g
  3. 24 g
  4. 12 g

Explanation

Total urinary nitrogen equals urine urea nitrogen plus the constant non-urea nitrogen fraction (typically about 4 g). Adding 12 g and 4 g gives 16 g, which is then used with a 6.25 conversion factor to estimate protein catabolism.

Question 2Advanced Clinical Nutrition Assessment and Diagnosis

Which laboratory marker is most appropriate for assessing recent (short-term) dietary protein intake in a stable outpatient?

  1. Hemoglobin A1c
  2. Serum albumin
  3. Serum ferritin
  4. Prealbumin (transthyretin) Correct answer.

Explanation

Prealbumin has a short half-life of roughly two days, so it responds relatively quickly to changes in protein and energy intake. Albumin reflects a longer window and is heavily influenced by inflammation and hydration.

Question 3Advanced Clinical Nutrition Assessment and Diagnosis

During a nutrition-focused physical exam, a patient shows temporal wasting, prominent clavicles, and interosseous muscle depletion. These findings most directly support which diagnosis?

  1. Severe fat and muscle depletion consistent with malnutrition Correct answer.
  2. Isolated obesity with sarcopenia
  3. Fluid overload from heart failure
  4. Essential fatty acid deficiency

Explanation

Temporal wasting, prominent clavicles, and interosseous depletion are classic signs of muscle and subcutaneous fat loss used in nutrition-focused physical examination. Together they support a malnutrition diagnosis rather than isolated deficiency or fluid states.

Question 4Advanced Clinical Nutrition Assessment and Diagnosis

Which anthropometric measurement is most useful for estimating visceral adiposity risk in a clinical nutrition assessment?

  1. Knee height
  2. Head circumference
  3. Waist circumference Correct answer.
  4. Mid-upper arm circumference

Explanation

Waist circumference indexes central (visceral) adiposity and cardiometabolic risk and is a standard component of adult nutrition assessment. The other measures estimate lean mass, stature, or growth rather than central fat distribution.

Question 5Advanced Clinical Nutrition Assessment and Diagnosis

A 70-year-old with chronic kidney disease has a body mass index of 23 kg/m2 but reports unintentional loss of 8% of body weight over six months. Which assessment conclusion is most appropriate?

  1. Meets criteria only if albumin is below 3.0 g/dL
  2. Meets malnutrition criteria based on weight loss despite a normal BMI Correct answer.
  3. Meets criteria only if handgrip strength is reduced
  4. Does not meet malnutrition criteria because BMI is within range

Explanation

Unintentional weight loss of more than 5% within six months meets a recognized malnutrition criterion independent of BMI category. A normal BMI does not exclude malnutrition when significant weight loss has occurred.

Question 6Advanced Clinical Nutrition Assessment and Diagnosis

A patient's indirect calorimetry yields a measured resting energy expenditure of 1,500 kcal/day, while the Harris-Benedict equation predicts 1,800 kcal/day. How should the dietitian interpret this?

  1. The patient is hypometabolic relative to prediction and measured value should guide intake Correct answer.
  2. The patient is hypermetabolic and needs 1,800 kcal/day
  3. The measured value is invalid because it is below prediction
  4. Prediction equations should always override measured values

Explanation

Indirect calorimetry directly measures oxygen consumption and carbon dioxide production, so a measured value below prediction suggests relative hypometabolism. Clinical guidelines favor measured energy expenditure over predictive equations when calorimetry is available and technically valid.

Question 7Advanced Clinical Nutrition Assessment and Diagnosis

Which parameter is required to calculate the respiratory quotient during indirect calorimetry?

  1. Ratio of oxygen consumed to carbon dioxide produced
  2. Ratio of measured to predicted energy expenditure
  3. Ratio of carbon dioxide produced to oxygen consumed Correct answer.
  4. Ratio of urine urea nitrogen to total nitrogen

Explanation

The respiratory quotient is the volume of carbon dioxide produced divided by the volume of oxygen consumed. Values near 0.7 suggest fat oxidation, near 0.85 mixed substrate use, and above 1.0 net lipogenesis.

Question 8Advanced Clinical Nutrition Assessment and Diagnosis

A patient with advanced cirrhosis has a serum albumin of 2.6 g/dL but reports adequate oral intake and stable weight. How should the dietitian interpret the low albumin?

  1. The value indicates inadequate carbohydrate intake
  2. The low albumin confirms protein-energy malnutrition
  3. Albumin is likely depressed by hepatic synthetic dysfunction and inflammation rather than intake alone Correct answer.
  4. Albumin should be corrected by aggressive protein restriction

Explanation

Albumin is synthesized by the liver and behaves as a negative acute-phase reactant, so cirrhosis and inflammation lower it independently of intake. Nutrition status should be judged from intake, weight trend, and physical findings rather than albumin alone.

Question 9Advanced Clinical Nutrition Assessment and Diagnosis

Which method is considered the reference standard for measuring body composition in a clinical research setting?

  1. Dual-energy X-ray absorptiometry Correct answer.
  2. Skinfold thickness
  3. Bioelectrical impedance analysis
  4. Mid-upper arm circumference

Explanation

Dual-energy X-ray absorptiometry provides validated compartment-specific estimates of fat and lean mass and is widely used as a reference method. Field methods such as impedance and skinfolds are practical but more affected by hydration and technician technique.

Question 10Advanced Clinical Nutrition Assessment and Diagnosis

A patient with severe edema from nephrotic syndrome is weighed daily. How should the dietitian interpret a 3 kg weight gain over two days?

  1. Definite gain of 3 kg of adipose tissue
  2. Reliable measure of lean mass increase
  3. Likely fluid accumulation rather than tissue gain Correct answer.
  4. Evidence of improved nutrition status

Explanation

Rapid weight change over one to two days almost always reflects fluid shifts, since tissue gain of that magnitude is physiologically implausible. In edematous states, weight trends must be interpreted alongside fluid status and intake records.

Question 11Advanced Clinical Nutrition Assessment and Diagnosis

Which laboratory finding is most consistent with protein-energy malnutrition in a patient without inflammation?

  1. Elevated serum ferritin with normal albumin
  2. Elevated C-reactive protein with normal prealbumin
  3. High retinol-binding protein with high albumin
  4. Low prealbumin with low transferrin Correct answer.

Explanation

In the absence of inflammation, low prealbumin and transferrin are consistent with depleted visceral protein status from inadequate intake. Inflammatory states can lower these proteins independently, so interpretation requires knowing inflammatory status.

Question 12Advanced Clinical Nutrition Assessment and Diagnosis

A dietitian suspects essential fatty acid deficiency in a patient on long-term fat-free parenteral nutrition. Which clinical and laboratory pattern best supports this?

  1. Hyperpigmented rash and low serum ferritin
  2. Scaly dermatitis and elevated triene-to-tetraene ratio Correct answer.
  3. Peripheral neuropathy and low thiamine
  4. Night blindness and low retinol

Explanation

Essential fatty acid deficiency produces scaly dermatitis and a triene-to-tetraene ratio above the normal threshold because linoleic acid is replaced by oleic acid metabolites. It is a recognized complication of prolonged fat-free nutrition support.

Question 13Advanced Clinical Nutrition Assessment and Diagnosis

Which screening tool was developed specifically for hospitalized adults and incorporates weight loss, intake, and disease severity?

  1. Mini Nutritional Assessment (MNA)
  2. Malnutrition Universal Screening Tool (MUST)
  3. Patient-Generated Subjective Global Assessment (PG-SGA)
  4. Nutrition Risk Screening 2002 (NRS-2002) Correct answer.

Explanation

NRS-2002 was designed for hospitalized adults and combines nutritional status with disease severity to identify those likely to benefit from nutrition support. MUST is used across care settings, MNA targets older adults, and PG-SGA is a comprehensive assessment rather than a hospital screening tool.

Question 14Advanced Clinical Nutrition Assessment and Diagnosis

A patient reports a 24-hour food recall. Which limitation most affects the validity of this method?

  1. It cannot capture fluid intake
  2. It requires weighing all foods at the time of consumption
  3. It overestimates intake in all patients
  4. It relies on memory and may not represent usual intake Correct answer.

Explanation

A single 24-hour recall depends on memory and captures only one day, which may not reflect habitual intake. Multiple recalls or a food record are often used to improve representativeness.

Question 15Advanced Clinical Nutrition Assessment and Diagnosis

Which condition most increases a patient's protein requirements during critical illness?

  1. Mild seasonal allergic rhinitis
  2. Controlled hypothyroidism
  3. Major burns with large open wounds Correct answer.
  4. Stable chronic kidney disease without dialysis

Explanation

Major burns cause substantial protein loss through wounds and heightened catabolism, raising protein needs well above baseline. Stable conditions without catabolic stress generally do not require such increases.

Question 16Advanced Clinical Nutrition Assessment and Diagnosis

A patient's measured resting energy expenditure is 2,000 kcal/day. Using a stress factor of 1.2 for activity, what total energy estimate results?

  1. 2,400 kcal/day Correct answer.
  2. 1,800 kcal/day
  3. 2,000 kcal/day
  4. 2,200 kcal/day

Explanation

Multiplying measured resting energy expenditure by an activity or stress factor of 1.2 gives 2,400 kcal/day. This accounts for energy expended above resting conditions when measured expenditure is used as the base.

Question 17Advanced Clinical Nutrition Assessment and Diagnosis

Which finding on a nutrition-focused physical exam is most specific for dehydration?

  1. Koilonychia
  2. Bitemporal wasting
  3. Sunken eyes with dry mucous membranes and poor skin turgor Correct answer.
  4. Angular stomatitis

Explanation

Sunken eyes, dry mucous membranes, and reduced skin turgor are classic signs of volume depletion. The other findings reflect muscle wasting or specific micronutrient deficiencies rather than hydration status.

Question 18Advanced Clinical Nutrition Assessment and Diagnosis

A pregnant patient's weight is being tracked. Which pattern most warrants nutrition intervention?

  1. Stable weight in the first trimester with normal intake
  2. Inadequate gestational weight gain for prepregnancy BMI category Correct answer.
  3. Weight gain within the recommended range for BMI
  4. Weight gain slightly above the range in the third trimester

Explanation

Gestational weight gain outside the Institute of Medicine ranges for the prepregnancy BMI category signals increased risk for maternal and fetal complications and warrants assessment. Gains within recommended ranges are expected and appropriate.

Question 19Advanced Clinical Nutrition Assessment and Diagnosis

Which biomarker is used to assess long-term glycemic control and can inform nutrition counseling goals?

  1. Serum albumin
  2. Hemoglobin A1c Correct answer.
  3. Prealbumin
  4. C-reactive protein

Explanation

Hemoglobin A1c reflects average blood glucose over roughly the prior three months and is used to set and monitor glycemic goals. The other markers reflect nutrition or inflammation status rather than glycemia.

Question 20Advanced Clinical Nutrition Assessment and Diagnosis

A dietitian wants to estimate skeletal muscle mass in a bedbound patient who cannot stand. Which approach is most practical?

  1. Standing height and weight for BMI
  2. Mid-upper arm muscle circumference derived from arm circumference and triceps skinfold Correct answer.
  3. Dual-energy X-ray absorptiometry in a standing position
  4. Waist-to-hip ratio

Explanation

Mid-upper arm muscle circumference, calculated from arm circumference and triceps skinfold, provides a practical estimate of muscle mass when standing is not possible. BMI and waist ratios do not estimate muscle mass, and DXA requires positioning the patient can tolerate.

Question 21Advanced Clinical Nutrition Assessment and Diagnosis

Which statement best describes the role of C-reactive protein in nutrition assessment?

  1. It helps distinguish inflammation-driven from intake-driven changes in visceral proteins Correct answer.
  2. It directly measures body fat percentage
  3. It is a specific marker of iron deficiency
  4. It replaces nitrogen balance in all patients

Explanation

CRP indicates the presence and magnitude of inflammation, which helps the dietitian interpret low albumin or prealbumin as possibly inflammation-driven rather than due to intake alone. It is not a composition or deficiency marker.

Question 22Advanced Clinical Nutrition Assessment and Diagnosis

A patient with short bowel syndrome has high ostomy output. Which assessment finding most directly reflects the resulting risk?

  1. Low serum magnesium and potassium with elevated stool sodium losses Correct answer.
  2. Elevated serum albumin with stable weight
  3. High serum ferritin with normal hemoglobin
  4. Normal prealbumin with low CRP

Explanation

High ostomy output causes losses of water and electrolytes, particularly sodium, magnesium, and potassium, which can produce deficiencies. Monitoring these electrolytes is central to assessing and managing short bowel syndrome.

Question 23Advanced Clinical Nutrition Assessment and Diagnosis

Which factor most affects the accuracy of bioelectrical impedance analysis for body composition?

  1. Hydration status Correct answer.
  2. Shoe size
  3. Hair color
  4. Blood type

Explanation

Bioelectrical impedance depends on the conduction of an electrical current through body water, so hydration status strongly influences results. Standardizing hydration and measurement conditions improves reliability.

Question 24Advanced Clinical Nutrition Assessment and Diagnosis

A patient's nitrogen balance is calculated as intake minus output and yields a negative value. What does this indicate?

  1. Net protein catabolism exceeding intake Correct answer.
  2. Positive protein anabolism
  3. Balanced nitrogen intake and output
  4. Excess dietary carbohydrate intake

Explanation

A negative nitrogen balance means nitrogen losses exceed intake, indicating net breakdown of body protein. Positive balance indicates anabolism or growth, and zero indicates equilibrium.

Question 25Advanced Clinical Nutrition Assessment and Diagnosis

Which assessment approach best captures usual dietary intake over several months in a free-living adult?

  1. One random spot urine collection
  2. A single 24-hour recall
  3. Repeated 24-hour recalls combined with a food frequency questionnaire Correct answer.
  4. A single body weight measurement

Explanation

Combining repeated recalls with a food frequency questionnaire captures both day-to-day detail and habitual patterns over time. A single recall or a single biomarker sample cannot represent long-term usual intake.

Question 26Advanced Clinical Nutrition Assessment and Diagnosis

A dietitian is selecting a screening tool for use with older adults living in the community. Which tool was designed specifically for this population and combines appetite, weight loss, mobility, and psychological stress items?

  1. Mini Nutritional Assessment (MNA) Correct answer.
  2. Nutrition Risk Screening 2002 (NRS-2002)
  3. Subjective Global Assessment (SGA)
  4. Malnutrition Universal Screening Tool (MUST)

Explanation

The MNA was developed and validated for adults aged 65 and older, including community-dwelling, home-care, and institutional settings, and its full form and short form incorporate appetite, weight loss, mobility, neuropsychological stress, and body mass index. It is the tool most associated with geriatric nutrition risk screening.

Question 27Advanced Clinical Nutrition Assessment and Diagnosis

A hospitalized patient's chart lists a body mass index of 17.0 kg/m² with unintentional loss of 8% of body weight over the past 3 months and a diagnosis of severe pneumonia. Using the Global Leadership Initiative on Malnutrition (GLIM) framework, how should this patient be classified?

  1. Malnutrition is confirmed; severity is staged as moderate based on BMI
  2. Malnutrition cannot be diagnosed because inflammation is present
  3. Malnutrition is not present because weight loss is below 10%
  4. Malnutrition is confirmed; severity is staged as severe based on BMI Correct answer.

Explanation

GLIM requires at least one phenotypic criterion (weight loss, low BMI, or reduced muscle mass) plus one etiologic criterion (reduced intake/absorption or inflammation/disease burden). This patient meets phenotypic criteria and has disease-related inflammation, and a BMI below 18.5 kg/m² in adults under 70 marks severe malnutrition, so the diagnosis is confirmed and staged as severe.

Question 28Advanced Clinical Nutrition Assessment and Diagnosis

A dietitian is interpreting a 24-hour urinary creatinine excretion in a patient with markedly reduced skeletal muscle mass. Which conclusion is most appropriate?

  1. Creatinine excretion will be lower because it reflects the creatine pool in muscle Correct answer.
  2. Creatinine excretion will overestimate muscle mass because creatinine is retained in adipose tissue
  3. Creatinine excretion is unaffected by muscle mass and reflects recent dietary protein
  4. Creatinine excretion will be falsely elevated by reduced glomerular filtration

Explanation

Urinary creatinine derives from the nonenzymatic breakdown of creatine phosphate in skeletal muscle, so daily excretion is roughly proportional to total muscle mass. In a patient with depleted muscle, excretion falls accordingly, and the dietitian should interpret low values as consistent with reduced lean mass rather than as a laboratory error.

Question 29Advanced Clinical Nutrition Assessment and Diagnosis

During a nutrition-focused physical examination, a dietitian assesses the temporal region of an adult patient's head. Which finding is most consistent with loss of subcutaneous fat?

  1. Visible concavity with hollowing of the temporal region Correct answer.
  2. Coarse, sparse hair over the temples
  3. Fullness with slight rounding over the temple
  4. Bilateral pitting edema over the forehead

Explanation

Temporal wasting is graded by the degree of hollowing between the lateral orbital rim and the hairline; a clearly sunken or hollow appearance indicates subcutaneous fat and muscle loss. Fullness or slight rounding is normal, so the presence of concavity is the finding that signals depletion.

Question 30Advanced Clinical Nutrition Assessment and Diagnosis

A patient with chronic kidney disease stage 4 has a serum albumin of 3.1 g/dL and a CRP of 18 mg/L. Which interpretation of the albumin value is most accurate?

  1. Albumin confirms protein-energy malnutrition because it is below the reference range
  2. Albumin is reduced partly by inflammation and is not a specific nutrition marker Correct answer.
  3. Albumin is unaffected by kidney disease and reflects visceral protein stores
  4. Albumin is a sensitive marker of short-term dietary protein intake

Explanation

Albumin behaves as a negative acute-phase reactant, so inflammatory cytokines suppress its hepatic synthesis and increase its transcapillary loss independently of nutrient intake. Its long half-life and large body pool also make it insensitive to short-term dietary change, so a low value in an inflamed patient should not be read as a specific index of malnutrition.

Question 31Advanced Clinical Nutrition Assessment and Diagnosis

A dietitian is using a food frequency questionnaire to estimate a free-living adult's usual intake over the previous year. Which characteristic of this instrument most limits its quantitative precision?

  1. It relies on a fixed list and memory-based estimation of portion sizes Correct answer.
  2. It cannot be self-administered
  3. It requires weighed food records to be valid
  4. It captures only the previous 24 hours of intake

Explanation

A food frequency questionnaire asks respondents to recall how often and how much they usually consume from a predefined food list, so its accuracy depends on memory, the completeness of that list, and the respondent's ability to estimate portions. These features make it useful for ranking usual intake but weaker for precise quantification.

Question 32Advanced Clinical Nutrition Assessment and Diagnosis

A patient receiving hemodialysis is assessed for protein-energy wasting. Which combination of findings best supports this diagnosis?

  1. Serum albumin 3.9 g/dL with stable dry weight and adequate intake
  2. Elevated CRP with normal appetite and stable lean mass
  3. Isolated low serum prealbumin with normal weight and muscle mass
  4. Low serum albumin, reduced mid-arm muscle circumference, and unintentional weight loss Correct answer.

Explanation

Protein-energy wasting in kidney disease is defined by multiple criteria, including low serum albumin or cholesterol, reduced body mass or muscle mass, and decreased intake or weight loss. The combination of biochemical depletion, anthropometric muscle loss, and unintentional weight loss satisfies several criteria and supports the diagnosis.

Question 33Advanced Clinical Nutrition Assessment and Diagnosis

A dietitian is estimating energy needs for a critically ill patient using the Penn State equation. Which input distinguishes the Penn State equation from simple weight-based predictive equations?

  1. Body mass index category alone
  2. Diet-induced thermogenesis factor
  3. Minute ventilation measured from the ventilator Correct answer.
  4. Serum albumin concentration

Explanation

The Penn State equation was developed for mechanically ventilated patients and incorporates measured minute ventilation along with body temperature and, in the revised version, age and a weight term. Minute ventilation is the variable that reflects the metabolic demand of breathing and is not part of simple weight-based formulas.

Question 34Advanced Clinical Nutrition Assessment and Diagnosis

A patient with ascites is being assessed for nutritional status. Which anthropometric adjustment is most appropriate when interpreting body weight?

  1. Estimate dry weight by subtracting an assumed fluid amount based on grade of ascites Correct answer.
  2. Use a weight obtained after a large paracentesis only
  3. Use ideal body weight calculated from height
  4. Use current weight without adjustment

Explanation

Ascites and peripheral edema add fluid weight that obscures true body mass, so clinicians estimate dry or adjusted weight by subtracting an amount consistent with the severity of ascites, often roughly 2 to 5 kg depending on grade. Serial weights and clinical correlation are needed because the correction is an estimate.

Question 35Advanced Clinical Nutrition Assessment and Diagnosis

A patient reports unintentionally eating less than half of usual intake for the past 10 days because of painful oral mucositis. Which GLIM etiologic criterion does this finding satisfy?

  1. Reduced food intake or assimilation Correct answer.
  2. Disease burden or inflammation
  3. Low body mass index
  4. Loss of muscle mass

Explanation

GLIM separates phenotypic criteria (weight loss, low BMI, reduced muscle mass) from etiologic criteria (reduced intake or assimilation, and disease burden or inflammation). Prolonged intake below half of requirements satisfies the reduced intake criterion, which must then be paired with a phenotypic criterion to establish the diagnosis.

Question 36Advanced Clinical Nutrition Assessment and Diagnosis

A dietitian is evaluating a patient for refeeding syndrome risk before initiating nutrition support. Which combination of pre-feeding findings places the patient at highest risk?

  1. BMI of 16 kg/m², negligible intake for 12 days, and low serum phosphate Correct answer.
  2. BMI of 22 kg/m² with 3% weight loss over 6 months
  3. BMI of 30 kg/m² with isolated hypomagnesemia
  4. BMI of 28 kg/m² with normal electrolytes and no weight loss

Explanation

Major risk factors for refeeding syndrome include low body mass index, prolonged negligible intake, and pre-existing electrolyte depletion such as hypophosphatemia. The presence of several major criteria together identifies a patient who needs slow initiation of feeding, thiamine supplementation, and close electrolyte monitoring.

Question 37Advanced Clinical Nutrition Assessment and Diagnosis

A dietitian needs to determine the resting energy expenditure of a patient who is spontaneously breathing, alert, and able to cooperate with a canopy measurement. Which condition must be met for the indirect calorimetry result to be considered valid?

  1. The fraction of inspired oxygen must exceed 60%
  2. The patient must be receiving continuous enteral feeding during the test
  3. The measured respiratory quotient must fall within a plausible physiologic range Correct answer.
  4. The test must be performed immediately after a meal

Explanation

A valid indirect calorimetry study requires a steady metabolic state and a respiratory quotient within a plausible range, roughly 0.7 to 1.0, because values outside it suggest measurement error, hyperventilation, or non-steady-state conditions. Stable oxygen consumption and carbon dioxide production are also required for the calculation to be trustworthy.

Question 38Advanced Clinical Nutrition Assessment and Diagnosis

A dietitian is assessing a patient with a suspected eating disorder who reports a normal body weight. Which assessment approach is most useful for detecting restrictive eating behavior that weight alone would miss?

  1. Calculate percent ideal body weight only
  2. Measure serum albumin as a marker of restriction
  3. Use a validated eating disorder screening instrument such as the SCOFF questionnaire Correct answer.
  4. Rely on body mass index because normal weight excludes an eating disorder

Explanation

Eating disorders occur across the weight spectrum, so a normal body mass index does not exclude them. Brief validated screens such as the SCOFF questionnaire probe core behaviors and cognitions and are appropriate for identifying patients who need further evaluation regardless of weight.

Question 39Advanced Clinical Nutrition Assessment and Diagnosis

A dietitian is choosing an anthropometric measure to track changes in visceral adiposity in a patient with a stable body mass index. Which measure is most appropriate?

  1. Head circumference
  2. Calf circumference
  3. Mid-upper arm circumference
  4. Waist circumference Correct answer.

Explanation

Waist circumference reflects abdominal and visceral fat distribution and can change even when body mass index is stable. It is therefore the preferred simple anthropometric index for tracking central adiposity and associated cardiometabolic risk.

Question 40Advanced Clinical Nutrition Assessment and Diagnosis

A dietitian is interpreting a serum prealbumin (transthyretin) concentration of 12 mg/dL drawn from a patient two days after major surgery. Which interpretation is most defensible?

  1. The value indicates adequate visceral protein because it is within the reference range
  2. The value confirms chronic protein-energy malnutrition
  3. The value should be used to set the patient's protein prescription
  4. The value is likely depressed by the acute-phase response and does not reflect intake alone Correct answer.

Explanation

Transthyretin has a short half-life and is suppressed by inflammation and surgical stress, so a low value in the early postoperative period cannot be attributed to nutrition status alone. It should not be used as a stand-alone diagnostic or prescriptive marker in acutely ill patients.

Question 41Medical Nutrition Therapy in Complex and Critically Ill Patients

A patient in the ICU with septic shock and hemodynamic instability requires nutrition support. Which route of feeding is generally preferred once enteral access is established and the patient is tolerating it?

  1. Intravenous lipid emulsion alone
  2. Post-pyloric continuous feeding Correct answer.
  3. Gastric bolus feeding
  4. Peripheral parenteral nutrition

Explanation

In hemodynamically unstable ICU patients, gastric feeding is often poorly tolerated because of delayed emptying and risk of aspiration, so post-pyloric continuous infusion is favored. Continuous delivery also improves tolerance when splanchnic perfusion is marginal. Parenteral routes are reserved for when enteral feeding fails or is contraindicated.

Question 42Medical Nutrition Therapy in Complex and Critically Ill Patients

Which laboratory marker is most commonly used to monitor the acute-phase inflammatory response that confounds interpretation of visceral protein status in critically ill patients?

  1. Albumin
  2. Prealbumin (transthyretin)
  3. C-reactive protein Correct answer.
  4. Transferrin

Explanation

C-reactive protein rises rapidly with inflammation and is used to gauge the acute-phase response, which makes visceral proteins unreliable as nutrition markers. Prealbumin, transferrin, and albumin all fall during inflammation regardless of intake. Clinicians therefore interpret these proteins cautiously in critical illness.

Question 43Medical Nutrition Therapy in Complex and Critically Ill Patients

A 70 kg patient with acute respiratory distress syndrome is being fed enterally. Which caloric target best reflects current recommendations to avoid overfeeding in the acute phase?

  1. 25-30 kcal/kg/day Correct answer.
  2. 35 kcal/kg/day
  3. 40 kcal/kg/day
  4. 15-20 kcal/kg/day

Explanation

Guidelines recommend approximately 25-30 kcal/kg/day during the acute phase of critical illness, with attention to avoiding overfeeding. Overfeeding, particularly with excess carbohydrate, increases carbon dioxide production and can worsen respiratory status. Higher targets are generally reserved for recovery or anabolic phases.

Question 44Medical Nutrition Therapy in Complex and Critically Ill Patients

Which strategy is recommended to reduce the risk of refeeding syndrome when initiating nutrition in a severely malnourished patient?

  1. Start at full caloric goal immediately
  2. Restrict all carbohydrates indefinitely
  3. Withhold thiamine supplementation
  4. Start low and advance gradually while monitoring electrolytes Correct answer.

Explanation

Refeeding syndrome is mitigated by starting calories below goal and advancing slowly while monitoring and correcting electrolytes such as phosphate, potassium, and magnesium. Thiamine should be given before or with feeding. Abrupt full-goal feeding increases the risk of dangerous electrolyte shifts.

Question 45Medical Nutrition Therapy in Complex and Critically Ill Patients

A patient with acute kidney injury receiving continuous renal replacement therapy has elevated protein needs. Which protein intake range is most appropriate?

  1. 1.5-2.0 g/kg/day Correct answer.
  2. 1.0-1.2 g/kg/day
  3. 0.8-1.0 g/kg/day
  4. 0.6-0.8 g/kg/day

Explanation

Continuous renal replacement therapy removes amino acids and proteins, so protein requirements rise to roughly 1.5-2.0 g/kg/day in critically ill patients on CRRT. Standard lower targets risk negative nitrogen balance. Higher protein intake helps offset dialytic losses.

Question 46Medical Nutrition Therapy in Complex and Critically Ill Patients

Which condition is an absolute contraindication to initiating enteral nutrition?

  1. Hemodynamic stability on low-dose vasopressors
  2. Bowel obstruction with active vomiting and distension Correct answer.
  3. Mild pancreatitis with tolerated oral intake
  4. Recent tracheostomy

Explanation

Enteral feeding is contraindicated in complete mechanical bowel obstruction with vomiting and distension because the feed cannot pass and aspiration risk is high. Many other conditions, including mild pancreatitis and low-dose vasopressor use, do not preclude enteral feeding. A recent tracheostomy is not itself a contraindication.

Question 47Medical Nutrition Therapy in Complex and Critically Ill Patients

A patient with severe acute pancreatitis is unable to eat orally. What is the preferred nutrition approach once resuscitation is complete?

  1. Prolonged bowel rest with intravenous fluids alone
  2. Clear liquid diet only
  3. Total parenteral nutrition from day one
  4. Nasogastric enteral feeding Correct answer.

Explanation

Enteral nutrition, including nasogastric feeding, is preferred in severe acute pancreatitis because it maintains gut integrity and reduces infectious complications compared with parenteral nutrition. Bowel rest with fluids alone prolongs catabolism. Total parenteral nutrition is reserved for when enteral feeding fails.

Question 48Medical Nutrition Therapy in Complex and Critically Ill Patients

Which feeding strategy is recommended to reduce aspiration risk in a critically ill patient receiving gastric enteral nutrition?

  1. Elevating the head of the bed 30-45 degrees Correct answer.
  2. Keeping the patient supine during feeding
  3. Rapid high-volume bolus feeds
  4. Checking residual volumes every hour as the sole preventive measure

Explanation

Elevating the head of the bed 30-45 degrees reduces gastroesophageal reflux and aspiration during gastric feeding. Supine positioning and rapid bolus delivery increase aspiration risk. Routine residual volume checks are no longer emphasized as the primary preventive strategy.

Question 49Medical Nutrition Therapy in Complex and Critically Ill Patients

A patient with cirrhosis and hepatic encephalopathy is being fed enterally. Which protein recommendation is most appropriate?

  1. Provide normal protein intake of about 1.2-1.5 g/kg/day Correct answer.
  2. Severely restrict protein to 0.4 g/kg/day
  3. Withhold protein until encephalopathy resolves
  4. Use only branched-chain amino acid formulas

Explanation

Protein restriction is not recommended in hepatic encephalopathy; patients with cirrhosis are typically catabolic and need about 1.2-1.5 g/kg/day of protein. Adequate protein improves outcomes and does not worsen encephalopathy. Branched-chain amino acid formulas are not routinely required.

Question 50Medical Nutrition Therapy in Complex and Critically Ill Patients

Which vitamin deficiency is associated with prolonged use of certain parenteral nutrition formulations lacking adequate supplementation and can cause a serious neurologic syndrome?

  1. Folate
  2. Vitamin C
  3. Vitamin E
  4. Thiamine (vitamin B1) Correct answer.

Explanation

Thiamine deficiency can cause Wernicke encephalopathy and beriberi, and risk rises with inadequate parenteral supplementation or refeeding. Standard parenteral nutrition should include thiamine. Other vitamins listed are important but do not produce this classic neurologic syndrome.