If the body is in a state of negative water balance, this will have a direct and profound effect on the volume of
Rationale:
The statement is FALSE. Negative water balance means the body loses more water than it takes in, directly reducing the volume of extracellular fluid, particularly plasma volume, rather than intracellular fluid. This imbalance impacts blood pressure and overall hydration status, demonstrating the critical role of water in maintaining fluid compartments and physiological homeostasis within the body’s internal environment.
A: TRUE This option wrongly assumes a positive affirmation without considering the physiological consequences of negative water balance, which actually decreases fluid volumes rather than maintaining or increasing them, thus misrepresenting the actual effect on body fluid compartments.
B: FALSE This choice correctly identifies that negative water balance reduces body fluid volume, particularly extracellular fluid, emphasizing that water loss leads to diminished plasma volume, affecting circulation and cellular function, which aligns with physiological principles of fluid homeostasis.
An explorer has been lost in the desert for two days with very little water. As a result, you would expect to observe
Rationale:
Elevated vasopressin levels would be expected in an explorer lost in the desert with minimal water intake. Vasopressin, or antidiuretic hormone, increases to conserve water by reducing urine output and concentrating urine, helping maintain blood osmolarity and volume during dehydration caused by prolonged water deprivation in a hot environment such as a desert.
B: Decreased blood osmolarity is unlikely because dehydration raises blood osmolarity, triggering vasopressin release to retain water and restore osmotic balance, not lower it.
C: Normal urine production contradicts dehydration physiology, where vasopressin reduces urine volume to conserve water, so urine output typically decreases significantly in such conditions.
D: Increased blood volume is improbable since dehydration lowers blood volume due to water loss; vasopressin acts to conserve remaining fluid rather than increase overall blood volume.
An older adult patient receiving iso-osmolar continuous enteral nutrition develops restlessness, agitation, and weakness. Which laboratory result should the nurse report to the health care provider immediately?
Rationale:
The nurse should report Na+ 154 mEq/L (154 mmol/L) immediately. Elevated sodium levels indicate hypernatremia, which can cause neurological symptoms such as restlessness, agitation, and weakness, especially in older adults receiving enteral nutrition. Prompt intervention is critical to prevent severe complications like seizures or coma. Monitoring sodium helps maintain electrolyte balance and patient safety.
A: K+ 3.4 mEq/L (3.4 mmol/L). This potassium level is slightly low but not critically dangerous and unlikely to produce acute neurological symptoms compared to hypernatremia. It does not align with the patient’s restlessness and agitation.
B: Ca+2 7.8 mg/dL (1.95 mmol/L). Mild hypocalcemia may cause muscle cramps but rarely leads to severe agitation or restlessness seen here. The neurological signs correlate more closely with sodium imbalance than calcium fluctuations.
D: Base Balance This term is vague and nonspecific. Without a precise value, base balance cannot be linked directly to the patient’s symptoms or urgency, unlike the clearly elevated sodium level indicating hypernatremia.
The nurse is caring for a patient receiving peritoneal dialysis. The patient suddenly
Rationale:
The nurse should evaluate the patient's neurological status. Assessing neurological status is critical because sudden changes in a patient receiving peritoneal dialysis may indicate complications like electrolyte imbalances or infection, which can affect brain function. Early detection through neurological evaluation allows prompt intervention, preventing severe outcomes such as encephalopathy or seizures, ensuring patient safety and effective management during dialysis treatment.
A: The nurse should assess peritoneal dialysate return. Monitoring dialysate return focuses on fluid balance, not immediate neurological changes, missing urgent neurological deterioration risks in sudden patient status changes.
B: The nurse should check the patient's blood sugar. Blood sugar evaluation does not directly address acute neurological symptoms or dialysis-related complications causing sudden neurological decline.
C: The nurse should evaluate the patient's neurological status. This choice correctly prioritizes detecting neurological complications, essential for patient safety during sudden changes in peritoneal dialysis.
The most common cause of hypermagnesemia is
Rationale:
Hypermagnesemia is most commonly caused by renal failure. Renal failure impairs the kidneys' ability to excrete magnesium, leading to its accumulation in the blood. This retention results in elevated serum magnesium levels, making renal dysfunction the predominant etiology for hypermagnesemia compared to other systemic conditions that do not primarily affect magnesium clearance or balance.
A: Hepatic failure does not primarily affect magnesium excretion or cause its accumulation, as liver dysfunction influences metabolism differently and rarely leads to elevated magnesium levels.
C: Pulmonary disorders generally impact respiratory function and oxygenation but lack a direct role in magnesium regulation or clearance, so they are not typical causes of hypermagnesemia.
D: Cardiovascular disorders affect heart and vessel function but do not significantly alter magnesium homeostasis or renal excretion, thus they are not common sources of hypermagnesemia.
Dehydration may cause some ions to become concentrated. If a person was suffering from severe hyperkalemia, you would expect
Rationale:
Severe hyperkalemia would cause abnormal cardiac rhythms. Elevated potassium levels disrupt the normal electrical gradients across cardiac cell membranes, leading to altered excitability and conduction. This disturbance can precipitate arrhythmias, which are irregular heartbeats that pose significant health risks. The heart's rhythm is highly sensitive to potassium fluctuations, making hyperkalemia a critical factor in cardiac complications.
A: The potassium ion concentration of the interstitial fluid to be less than normal contradicts hyperkalemia’s definition, which involves elevated potassium levels, not reduced concentrations in the extracellular space.
B: The membrane potential of nerves and muscles to be more negative is inaccurate since increased extracellular potassium typically causes depolarization, making the membrane potential less negative.
D: Muscle weakness and increased strength of twitch contractions is inconsistent; hyperkalemia usually causes muscle weakness but does not enhance twitch contraction strength simultaneously.
Which statement related to dehydration made by a patient with hypovolemia is the best indicator to the nurse of the need for additional teaching?
Rationale:
Drinking coffee and cola drinks throughout the day is the best indicator that the patient needs additional teaching.
Caffeine-containing beverages like coffee and cola increase fluid loss through diuretic effects, which can worsen dehydration rather than prevent it. These drinks are not appropriate for managing hypovolemia, making this statement a critical sign that the patient misunderstands proper hydration strategies and requires further education.
A: "I will drink 2 to 3 L of fluids every day." This reflects appropriate fluid intake to maintain hydration and prevent hypovolemia.
B: "I will drink a glass of water whenever I feel thirsty." Thirst is a natural signal for hydration needs, so this statement shows understanding of when to consume fluids.
D: "I will avoid drinks containing alcohol." Avoiding alcohol is correct since it promotes fluid loss and worsens dehydration, demonstrating awareness of harmful beverages.
Following a thyroidectomy, a patient reports "a tingling feeling around my mouth." Which assessment should the nurse complete first?
Rationale:
Testing for the presence of Chvostek's sign should be completed first. This sign indicates hypocalcemia, a common complication after thyroidectomy due to potential parathyroid gland injury, causing tingling sensations. Early detection allows prompt intervention to prevent severe neuromuscular symptoms or cardiac issues related to low calcium levels, ensuring patient safety and appropriate management.
A: Verify the serum potassium level. Potassium imbalance rarely causes perioral tingling post-thyroidectomy, making this assessment less immediate than checking for hypocalcemia signs.
C: Observe for blood on the neck dressing. While important, bleeding does not explain tingling sensations and is less urgent compared to neurological symptoms indicating calcium deficiency.
D: Confirm a prescription for thyroid replacement. Thyroid hormone replacement is crucial long-term but does not address acute neuromuscular symptoms like tingling occurring immediately after surgery.
If the tubular filtrate becomes too acidic, what is secreted by the tubular epithelial cells to buffer the secreted H+?
Rationale:
The tubular epithelial cells secrete HCO₃⁻ to buffer the secreted H⁺ when the tubular filtrate becomes too acidic. HCO₃⁻ acts as a crucial buffer by neutralizing excess hydrogen ions, maintaining pH balance within the filtrate. This mechanism helps prevent excessive acidity and preserves proper renal function by stabilizing the environment in the nephron.
B: OH⁻ does not serve as a primary buffer in tubular filtrate; it is less involved in renal acid-base regulation compared to bicarbonate ions. The kidney primarily uses bicarbonate, not hydroxide ions, for acid neutralization.
C: NH₃ acts by trapping H⁺ into NH₄⁺ but is not directly secreted to buffer acidity; instead, it facilitates ammonium formation, an indirect acid-base balance mechanism.
D: NH₄⁺ is a product formed when NH₃ binds H⁺ but is not secreted to buffer acidity; it represents acid excretion rather than buffering of secreted hydrogen ions.
Which of the following descriptions best summarizes fluid homeostasis?
Rationale:
Almost every body organ and system helps maintain homeostasis. This description accurately reflects fluid homeostasis because it involves multiple organs and systems working together to regulate fluid balance, electrolyte levels, and overall internal stability. It emphasizes the integrative nature of homeostasis, where various physiological processes and organs contribute collectively rather than relying on a single system or structure.
B: The cardiovascular and renal systems primarily maintain homeostasis. This option overlooks the involvement of other systems like the endocrine and nervous systems, which also play critical roles in fluid regulation and maintaining internal equilibrium.
C: Homeostasis is maintained through intra- and extracellular exchange. While fluid exchange occurs, this statement focuses narrowly on cellular fluid movement, neglecting the systemic coordination required for overall fluid homeostasis.
D: Homeostasis is maintained by the arterioles, capillaries, and venules. These vascular components participate in fluid exchange but do not independently regulate fluid balance or homeostasis across the entire body.
The relationship between input and output of a substance is known as what?
Rationale:
The relationship between input and output of a substance is known as homeostasis. Homeostasis refers to the body's ability to maintain stable internal conditions by regulating the balance between the intake and elimination of substances, ensuring equilibrium and proper physiological function despite external changes or fluctuations in supply and demand.
A: balance concept suggests equilibrium but lacks the specific physiological regulation implied by homeostasis. It does not encompass the dynamic process of maintaining internal stability through input-output adjustments.
C: metabolic pool refers to the total available supply of substrates for metabolism, not the regulatory process managing their input and output balance or internal stability maintenance.
D: body reserves indicate stored nutrients or substances, focusing on quantity rather than the dynamic relationship governing intake and elimination to sustain internal conditions.
The hormone that directly controls water reabsorption by the kidneys is
Rationale:
Vasopressin directly controls water reabsorption by the kidneys. Vasopressin, also known as antidiuretic hormone (ADH), increases water permeability in kidney collecting ducts, promoting water reabsorption and concentrating urine. This hormone precisely regulates body water balance by signaling kidney cells to retain water, preventing dehydration and maintaining blood pressure and osmolarity within optimal physiological ranges.
B: Aldosterone primarily regulates sodium reabsorption and potassium excretion, indirectly influencing water balance but not directly controlling water reabsorption in kidney tubules. It mainly affects electrolyte balance rather than immediate water permeability.
C: Epinephrine functions mainly in the fight-or-flight response, affecting heart rate and blood vessel constriction, with no direct role in kidney water reabsorption mechanisms or antidiuretic hormone activity.
D: ANP (atrial natriuretic peptide) promotes sodium excretion and vasodilation, reducing blood volume and pressure, but it does not directly enhance water reabsorption by the kidneys like vasopressin does.
A nurse performing a nutritional assessment determines BMI of a 5-foot 11-inch male patient who weighs 180 pounds. What would be the BMI for this patient?
Rationale:
The BMI for a 5-foot 11-inch male weighing 180 pounds is 25.1. This value is derived by converting height to inches (71 inches), then to meters squared, and applying the BMI formula: weight (kg) ÷ height (m²). The calculation yields approximately 25.1, placing the patient in the overweight category, consistent with standard BMI classifications.
A: 18.5 represents the boundary for underweight status and does not match the patient's weight-height ratio, indicating it underestimates the actual BMI.
B: 20.3 reflects a normal weight range but is too low for this combination of height and weight, failing to account for the patient's actual mass.
D: 28.2 suggests a higher overweight category, overestimating the patient's BMI based on his 180-pound weight relative to 5'11" height measurements.
A hospitalized patient has been NPO with only intravenous fluid intake for a prolonged period. What assessments might indicate protein-calorie malnutrition?
Rationale:
Poor wound healing, apathy, and edema are classic signs of protein-calorie malnutrition due to inadequate nutrient supply affecting tissue repair, mental status, and fluid balance. These symptoms reflect the body's compromised ability to maintain normal physiological functions when deprived of sufficient protein and calories over an extended period, especially during prolonged NPO status with only intravenous fluids.
A: fever, joint pain, dehydration These symptoms primarily indicate infection, inflammation, or fluid loss rather than malnutrition, which typically presents with impaired healing and altered mental state rather than acute inflammatory signs.
C: sleep disturbances, anger, increased output These manifestations relate more to neurological or psychological issues and fluid balance changes, not the characteristic physical and cognitive signs of malnutrition.
D: weight gain, visual deficits, erythema of skin Weight increase contradicts malnutrition, while visual problems and skin redness are unrelated to protein-calorie deficiencies specifically caused by prolonged NPO status.
The cells of the distal nephron are interspersed among the principal cells and contribute to acid-base regulation.
Rationale:
The cells of the distal nephron interspersed among the principal cells that contribute to acid-base regulation are intercalated cells. Intercalated cells actively secrete hydrogen ions and reabsorb bicarbonate, playing a critical role in maintaining the body's acid-base balance. Their specialized function supports pH homeostasis within the renal tubules, distinguishing them from other cell types in the nephron.
A: Endothelial cells line blood vessels and do not participate in acid-base regulation in the nephron, making them unrelated to the distal nephron’s acid-base balancing function.
C: Endocrine cells release hormones systemically, lacking the localized acid-base regulatory role within the nephron’s distal tubule structure.
D: Granular cells secrete renin for blood pressure regulation, without involvement in acid-base homeostasis or direct nephron tubular function.
The osmolarity in the deepest part of the loop of Henle is mOsM.
Rationale:
The osmolarity in the deepest part of the loop of Henle is 1200 mOsM. This high osmolarity results from the active transport of solutes, particularly sodium and chloride ions, out of the ascending limb, creating a concentrated medullary interstitium essential for water reabsorption and urine concentration. This osmotic gradient is critical for kidney function.
B: 100 mOsM represents a hypotonic environment, which does not align with the kidney medulla’s hyperosmotic nature necessary for water reabsorption and urine concentration.
C: 300 mOsM reflects isotonic conditions similar to plasma, not the hyperosmotic environment found in the deepest loop of Henle.
D: 900 mOsM is less concentrated than the actual maximum osmolarity, insufficient to explain the kidney’s ability to produce highly concentrated urine.
A patients PaCO2 is abnormal on an ABG report. Which of the following illnesses would most likely be the medical diagnosis?
Rationale:
Chronic obstructive pulmonary disease most likely explains an abnormal PaCO2 on an ABG report. COPD impairs gas exchange and ventilation, causing retention of carbon dioxide, which elevates PaCO2 levels. This respiratory condition directly affects airway obstruction and alveolar ventilation, leading to abnormal arterial blood gases, particularly increased PaCO2, making it the most relevant diagnosis among the options given.
A: Rheumatoid arthritis primarily affects joints and is not typically associated with abnormal PaCO2 or respiratory gas exchange disturbances.
B: Sexually transmitted infections generally impact reproductive organs and do not influence arterial carbon dioxide levels.
D: Infections of the bladder and ureters affect the urinary tract, not respiratory function or PaCO2 regulation.
The most potent stimulus for vasopressin release is
Rationale:
Plasma osmolarity is the most potent stimulus for vasopressin release. Vasopressin secretion is primarily regulated by osmoreceptors sensitive to changes in plasma osmolarity; even slight increases trigger vasopressin release to conserve water. This mechanism finely tunes body fluid balance by promoting water reabsorption in kidneys, effectively concentrating urine and restoring osmotic equilibrium.
B: Blood volume influences vasopressin but less sensitively than osmolarity; baroreceptors respond only to significant volume loss, making it a secondary, less immediate trigger for vasopressin secretion.
C: Blood pressure affects vasopressin through baroreceptor activation but requires more substantial drops to elicit release, rendering it less sensitive than osmolarity in stimulating vasopressin.
D: Low potassium does not directly stimulate vasopressin release; potassium levels influence other hormonal pathways but lack a primary role in regulating vasopressin secretion.
Which of these statements describes chemical buffer systems?
Rationale:
Chemical buffer systems respond to changes in acid or base levels.
This option accurately captures the fundamental role of chemical buffer systems, which maintain pH balance by neutralizing excess acids or bases. They act quickly to prevent significant shifts in hydrogen ion concentration, stabilizing the body’s internal environment without relying on slower physiological mechanisms like respiration or renal function.
A: They respond in one to three minutes to changes in hydrogen ion concentration. This timing aligns with respiratory or renal responses, not the almost instantaneous action of chemical buffers.
C: They promote H+ excretion by the kidneys when acidosis is present. Kidney function is a slower compensatory mechanism distinct from the immediate neutralization performed by chemical buffers.
D: They stimulate the respiratory centre when acidosis is present. Respiratory stimulation is controlled by chemoreceptors, not chemical buffer systems, which function through chemical reactions rather than neural pathways.
The nurse is caring for a patient who has a temporary percutaneous dialysis catheter in
Rationale:
Assess the catheter site for redness and/or swelling.
Monitoring the catheter insertion site for signs of redness or swelling is crucial to identify early infection or inflammation, ensuring timely intervention. This practice supports patient safety by preventing complications associated with percutaneous dialysis catheters, promoting wound healing, and maintaining catheter function throughout the temporary usage period.
A: In caring for this patient, the nurse should lacks specificity and does not address the essential action required for catheter care.
B: Apply a sterile gauze dressing to maintain sterility overlooks the preferred transparent dressing that allows site visualization without frequent disruption.
C: Replace the transparent dressing every 10 days to prevent manipulation understates the recommended frequency; dressings should be changed weekly or when compromised.
A nurse is teaching a young mother about meal preparation for good nutrition. What is one recommendation of the MyPyramid Food Guide?
Rationale:
Eating whole-grain foods with meals is a key recommendation of the MyPyramid Food Guide. This guide emphasizes balanced nutrition by encouraging the consumption of whole grains to provide essential fiber, vitamins, and minerals. Whole grains support digestive health and reduce the risk of chronic diseases, aligning with the guide’s goal to promote overall well-being through varied and nutrient-rich food choices.
A: Increase intake of saturated fats contradicts nutritional guidelines since saturated fats raise cholesterol and heart disease risk, making this recommendation unsuitable for healthy meal preparation.
C: Change the number of food groups misrepresents the MyPyramid’s structure, which maintains consistent food groups to help individuals balance nutrient intake appropriately.
D: Decrease emphasis on chronic illness ignores the guide’s focus on reducing disease risk through proper nutrition, which is central to its educational purpose.
A physician writes an order to force fluids. What will be the first action the nurse will take in implementing this order?
Rationale:
The first action the nurse will take is to explain to the patient why this is needed. This step ensures the patient understands the purpose and importance of increased fluid intake, promoting cooperation and adherence. Effective communication establishes trust, reduces anxiety, and facilitates compliance, making the implementation of the physician’s order smoother and more successful in achieving the desired health outcome.
B: Tell the patient and family to increase oral intake focuses on instruction without first ensuring the patient's comprehension or consent, which may hinder cooperation and compliance.
C: Decide how much fluid to increase each 8 hours assumes dosing without patient involvement or initial explanation, potentially causing confusion or noncompliance.
D: Divide the intake so the largest amount is at night is impractical and not aligned with standard nursing practices for fluid distribution, risking discomfort or poor absorption.
A patient with renal failure is on a low phosphate diet. Which food should the nurse instruct unlicensed assistive personnel (UAP) to remove from the patient's food tray?
Rationale:
Skim Milk should be removed from the patient's food tray.
Skim milk contains high levels of phosphate, which can worsen hyperphosphatemia in renal failure patients. A low phosphate diet aims to limit such foods to prevent complications like bone disease and vascular calcification. Removing skim milk helps maintain appropriate phosphate levels, supporting renal function and reducing potential harm in these patients.
B: Grape Juice contains minimal phosphate, making it suitable for a low phosphate diet and safe for renal failure patients.
C: TEA has negligible phosphate content and does not contribute significantly to phosphate load, thus appropriate for patients on low phosphate diets.
D: Mixed Green Salad generally has low phosphate content, making it acceptable and not requiring removal from the tray.
A 100-kg patient gets hemodialysis 3 days a week. In planning the care for this patient, the nurse recommends
Rationale:
A diet of 2500 to 3500 kcal per day is recommended for a 100-kg patient undergoing hemodialysis three times weekly. This caloric range supports adequate energy needs, prevents protein catabolism, and helps maintain nutritional status during dialysis, which increases metabolic demands and nutrient loss. Proper calorie intake is crucial to prevent malnutrition and support recovery.
B: Protein intake of less than 50 grams per day is insufficient for hemodialysis patients, who require higher protein to compensate for losses during treatment and maintain nitrogen balance.
C: Potassium intake of 10 mEq per day is excessively low and could lead to hypokalemia; potassium needs vary and must be individualized based on serum levels and dialysis efficacy.
D: Fluid intake of less than 500 mL per day is overly restrictive, risking dehydration; fluid allowances depend on residual kidney function and interdialytic weight gain.
Chemical buffer systems are the most powerful mechanism available for defending against changes in [H+] because they respond the fastest.
Rationale:
Chemical buffer systems are not the most powerful mechanism for defending against changes in [H+] despite their rapid response.
Buffer systems quickly neutralize excess acids or bases but can be overwhelmed; respiratory and renal systems provide stronger, longer-term regulation by controlling CO2 and bicarbonate levels, which have greater capacity to maintain pH homeostasis over time.
A: TRUE Overemphasizes speed alone, neglecting that buffers have limited capacity and cannot completely stabilize pH without respiratory and renal contributions, which offer more substantial control.
B: FALSE Correctly acknowledges that while buffers act fastest, they are not the most powerful, as other physiological systems provide more comprehensive and effective acid-base balance.
To diagnose SIADH as the cause of hyponatremia which must not be present?
Rationale:
Hypovolemia must not be present to diagnose SIADH as the cause of hyponatremia. SIADH typically occurs with euvolemia or slight hypervolemia, not hypovolemia, which suggests other causes like volume depletion. Identifying absence of hypovolemia helps distinguish SIADH from other hyponatremic states involving fluid loss or inadequate sodium retention, crucial for accurate diagnosis and management.
B: Hypotonicity occurs in SIADH but is not a criterion that must be absent; it actually supports the diagnosis by indicating dilutional hyponatremia. Its presence does not exclude SIADH but rather complements it.
C: No cardiac/renal/hepatic failure is necessary to exclude other causes of hyponatremia, but this criterion does not directly rule out hypovolemia, which must be absent for SIADH diagnosis.
D: Urine osmolality >100 ml/kg indicates inappropriately concentrated urine in SIADH; it is a supportive diagnostic feature, not a condition that must be absent to confirm SIADH.
The patient is complaining of severe flank pain when he tries to urinate. His urinalysis shows sediment and crystals along with a few bacteria. Using this information along with the clinical picture, the nurse realizes that the patient's condition is
Rationale:
The patient's condition is postrenal.
Postrenal causes involve obstruction of urine flow, which aligns with severe flank pain during urination and urinalysis showing sediment, crystals, and bacteria. These findings indicate urinary tract obstruction or infection leading to back pressure and pain, consistent with postrenal pathology rather than intrinsic kidney damage or perfusion issues.
A: prerenal. This option relates to decreased kidney perfusion without obstruction, not matching symptoms of pain and sediment crystals.
C: intrarenal. This reflects direct kidney damage, which typically shows different urinalysis findings and doesn’t primarily cause obstructive pain.
D: not renal related. The urinalysis abnormalities and flank pain clearly indicate a renal or urinary tract issue, excluding non-renal causes.
Which trace mineral would best be increased for a PN-dependent patient with intractable diarrhea?
Rationale:
Zinc would best be increased for a PN-dependent patient with intractable diarrhea. Zinc is crucial for immune function, wound healing, and intestinal mucosa integrity, which is often compromised during prolonged diarrhea. Parenteral nutrition patients are prone to zinc deficiency due to losses in stool and limited absorption, making supplementation essential to support recovery and prevent further complications related to zinc depletion.
B: Copper is vital for enzymatic reactions and red blood cell formation but is not primarily lost through diarrhea, so increasing it does not address the main trace mineral depletion in this scenario.
C: Iodine is essential for thyroid hormone synthesis but is not significantly affected by diarrhea or parenteral nutrition, making its adjustment irrelevant for this condition.
D: Manganese supports bone formation and metabolism but is rarely deficient in diarrhea cases and can accumulate dangerously in PN patients, so increasing it is not appropriate.
The nurse notes a serum calcium level of 7.9 mg/dL for a patient who has chronic malnutrition. Which action should the nurse expect to take first?
Rationale:
The nurse should first monitor the ionized calcium level. Monitoring ionized calcium provides a more accurate assessment of biologically active calcium in the blood, especially important in chronic malnutrition where total serum calcium may be misleading due to altered protein binding. This guides further treatment decisions by clarifying the patient’s true calcium status before interventions like supplementation or hormone evaluation.
B: Give oral calcium citrate tablets. Immediate supplementation without confirming ionized calcium risks inappropriate treatment since total serum calcium might not reflect the physiologically active fraction, particularly in malnourished patients with altered protein levels.
C: Check parathyroid hormone level. Measuring PTH without first understanding ionized calcium status may lead to premature conclusions, as PTH secretion is influenced by active calcium rather than total serum calcium alone.
D: Administer vitamin D supplements. Vitamin D administration before verifying ionized calcium and the underlying cause might result in ineffective or unsafe management, as vitamin D influences calcium absorption but does not replace the need for accurate calcium assessment.