Nclexpn Quiz: Laboratory And Diagnostic Monitoring
20 questions · exam conditions
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Laboratory And Diagnostic MonitoringQuestion 1 of 20

A 40-year-old client is receiving a continuous IV heparin infusion for a DVT. The aPTT result is 110 seconds (facility therapeutic range 60–80 seconds), and the client has new oozing at the IV site. Which lab result should the nurse report to the RN immediately?

INR 1.1
Platelets 190,000/mm³
Hemoglobin 12.9 g/dL
aPTT 110 seconds with bleeding at the IV site
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Nclexpn Quiz

Nclexpn Quiz: Laboratory And Diagnostic Monitoring

Practice Laboratory And Diagnostic Monitoring in Nclexpn with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

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This quiz focuses on Laboratory And Diagnostic Monitoring, giving you a quick way to practice the rules, question types, and explanations that matter most for Nclexpn.

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Question 1

A 40-year-old client is receiving a continuous IV heparin infusion for a DVT. The aPTT result is 110 seconds (facility therapeutic range 60–80 seconds), and the client has new oozing at the IV site. Which lab result should the nurse report to the RN immediately?

  1. INR 1.1
  2. Platelets 190,000/mm³
  3. Hemoglobin 12.9 g/dL
  4. aPTT 110 seconds with bleeding at the IV site (correct answer)
Explanation: This question tests reduction of risk potential through lab and diagnostic monitoring. The key lab value is aPTT 110 seconds with bleeding, indicating excessive anticoagulation from heparin. The correct answer reflects appropriate clinical judgment within the LPN/VN scope by prioritizing reporting to stop infusion and reverse effects. The distractors are less critical as platelets 190,000/mm³, hemoglobin 12.9 g/dL, and INR 1.1 are normal, a misconception that all coagulation labs require action without clinical correlation. The clinical decision-making process includes monitoring aPTT against therapeutic range, assessing for bleeding, and escalating for protamine. A transferable strategy is to trend coagulation studies during anticoagulant therapy. Understanding lab findings like prolonged aPTT is essential in reducing client risk by preventing hemorrhagic complications in thrombosis treatment.

Question 2

A 55-year-old client is 8 hours post-op after a bowel resection. The client has increasing abdominal pain and a rigid abdomen; vital signs show HR 122/min and BP 88/54 mm Hg. Hemoglobin has dropped from 12.4 g/dL pre-op to 8.1 g/dL. Which finding indicates the need for immediate intervention?

  1. Sodium 140 mEq/L with urine output of 60 mL/hr
  2. Temperature 99.1°F (37.3°C) with an incision that is slightly erythematous
  3. WBC 10,500/mm³ with a mild left shift on differential
  4. Hemoglobin falling to 8.1 g/dL with hypotension and tachycardia (correct answer)
Explanation: The client's rigid abdomen, tachycardia, hypotension, and hemoglobin falling to 8.1 g/dL after bowel resection point to postoperative hemorrhage. This finding requires immediate reporting for volume replacement and possible surgical intervention. A sodium of 140 mEq/L with urine output of 60 mL/hr is within normal limits and does not explain the unstable presentation. A low-grade temperature with slight incisional erythema may suggest early wound inflammation, but it is not the acute threat. A WBC of 10,500/mm³ with a mild left shift may accompany infection, yet it does not account for the rapid drop in hemoglobin and shock. The correct choice is the one that combines the falling hemoglobin with the hemodynamic instability, because that pair identifies both the problem and the urgency.

Question 3

A 51-year-old client is taking lithium for bipolar disorder and comes for routine monitoring after starting a new thiazide diuretic. The client reports nausea and hand tremors; the lithium level is 1.8 mEq/L (typical therapeutic range 0.6–1.2 mEq/L). Which lab result should the nurse report to the RN immediately?

  1. Serum calcium 9.0 mg/dL, unchanged from the previous clinic result
  2. Serum sodium 137 mEq/L, stable with the client's usual oral intake
  3. Serum glucose 104 mg/dL after eating only a light breakfast
  4. Serum lithium concentration of 1.8 mEq/L with nausea and tremors (correct answer)
Explanation: The reportable finding is the serum lithium concentration of 1.8 mEq/L with nausea and tremors. This is above the therapeutic range and, with a new thiazide diuretic reducing lithium clearance, points to lithium toxicity. The nurse should notify the RN immediately for reassessment and likely dose adjustment. Calcium 9.0 mg/dL is a normal calcium value, and being unchanged from a previous result makes it non-urgent. Sodium 137 mEq/L is a normal/low-normal sodium level; stable oral intake does not make it a critical reporting value. Glucose 104 mg/dL after a light breakfast is a normal postmeal glucose and does not explain the client's risk. The other values are plausible lab results, but they are not critical or related to the lithium toxicity.

Question 4

A 72-year-old client with atrial fibrillation takes warfarin daily and comes to the clinic for routine INR monitoring to guide dosing; today the client reports new gum bleeding when brushing teeth. The lab reports INR 5.6 (facility therapeutic goal 2.0–3.0). Which lab result should the nurse report to the RN immediately?

  1. INR 5.6 with new gum bleeding (correct answer)
  2. INR 2.4 with no bleeding
  3. Platelets 210,000/mm³
  4. Hemoglobin 13.2 g/dL
Explanation: This question tests reduction of risk potential through monitoring anticoagulation therapy and recognizing critical lab values. The INR of 5.6 is critically elevated (nearly double the therapeutic goal of 2.0-3.0) and combined with new bleeding symptoms indicates supratherapeutic anticoagulation requiring immediate intervention. The correct answer (A) reflects appropriate clinical judgment within LPN/VN scope by recognizing that an INR >5 with active bleeding requires immediate RN notification for potential warfarin dose adjustment or reversal. The other options (B: therapeutic INR without bleeding, C: normal platelets, D: normal hemoglobin) represent stable values that don't require immediate intervention, though option B's INR of 2.4 is therapeutic and appropriate for atrial fibrillation. The clinical decision-making process involves recognizing that INR >5 with bleeding symptoms indicates high risk for serious hemorrhage. A transferable strategy is to remember that INR >5 or any INR with new bleeding requires immediate action. Understanding coagulation studies is crucial for preventing life-threatening bleeding complications in anticoagulated patients.

Question 5

A 24-year-old client presents to urgent care with fatigue and heavy menstrual bleeding. Labs show hemoglobin 6.9 g/dL and hematocrit 21%; the client is pale and dizzy when standing. Which lab result should the nurse report to the RN immediately?

  1. Potassium 4.0 mEq/L
  2. WBC 7,800/mm³
  3. Platelets 320,000/mm³
  4. Hemoglobin 6.9 g/dL with dizziness (correct answer)
Explanation: This question tests reduction of risk potential through lab and diagnostic monitoring. The key lab value is hemoglobin 6.9 g/dL with dizziness, indicating severe anemia requiring transfusion or further evaluation. The correct answer reflects appropriate clinical judgment within the LPN/VN scope by prioritizing reporting for hemodynamic instability. The distractors are incorrect as WBC 7,800/mm³, platelets 320,000/mm³, and potassium 4.0 mEq/L are normal, a common misconception that fatigue alone does not warrant urgent action without lab confirmation. The clinical decision-making process involves assessing orthostatic symptoms, trending CBC, and escalating for blood products. A transferable strategy is to correlate hemoglobin with clinical signs of tissue hypoxia. Understanding lab findings like low hemoglobin is essential in reducing client risk by preventing syncope or organ damage from anemia.

Question 6

A 29-year-old client is 10 hours post-appendectomy and is being monitored for complications. The client has increasing lower abdominal pain and scant urine output; a bladder scan shows 650 mL of urine retained. What is the nurse's PRIORITY action based on the diagnostic findings?

  1. Encourage oral fluids and reassess in 2 hours
  2. Prepare to perform straight catheterization per protocol/provider order and notify the RN (correct answer)
  3. Administer PRN opioid pain medication only
  4. Apply a heating pad over the suprapubic area
Explanation: This question tests reduction of risk potential through using bladder scanning to diagnose post-operative urinary retention. The bladder scan showing 650 mL indicates significant urinary retention (>600 mL) requiring catheterization to prevent bladder damage and relieve discomfort. The correct answer (B) reflects appropriate clinical judgment within LPN/VN scope by recognizing that bladder volumes >600 mL require catheterization per protocol while notifying the RN of this post-operative complication. The other options are inappropriate: A (oral fluids won't help empty a distended bladder), C (pain medication alone won't address retention), and D (heat won't resolve mechanical retention). The clinical decision-making process involves recognizing that post-operative urinary retention >600 mL requires mechanical drainage. A transferable strategy is to use bladder scanning to objectively assess retention and guide intervention decisions. Understanding bladder scan interpretation prevents complications like bladder overdistension and post-operative urinary tract infections.

Question 7

A 33-year-old client in labor receives magnesium sulfate for preeclampsia. The client becomes lethargic; respirations are 10/min, and the magnesium level is 7.8 mg/dL (therapeutic often 4–7 mg/dL). Which finding indicates the need for immediate intervention?

  1. Respirations 10/min with magnesium level 7.8 mg/dL (correct answer)
  2. Blood pressure 148/92 mm Hg
  3. Urine output 40 mL/hr
  4. Mild flushing and warmth
Explanation: This question tests reduction of risk potential through lab and diagnostic monitoring. The key finding is respirations 10/min with magnesium level 7.8 mg/dL, indicating magnesium toxicity causing respiratory depression. The correct answer reflects appropriate clinical judgment within the LPN/VN scope by recognizing the need for antidote like calcium gluconate. The distractors are less critical as BP 148/92 mm Hg, urine output 40 mL/hr, and flushing are expected or mild, a misconception that all preeclampsia treatments are safe without monitoring. The clinical decision-making process involves assessing reflexes and vitals, correlating with levels, and preparing for discontinuation. A transferable strategy is to monitor magnesium levels and symptoms for toxicity in obstetric care. Understanding lab findings like elevated magnesium is crucial in reducing client risk by preventing respiratory arrest in preeclampsia.

Question 8

A 50-year-old client with alcohol use disorder is admitted with confusion and unsteady gait. Labs show sodium 118 mEq/L; the client has a headache and is increasingly drowsy. Which lab result should the nurse report to the RN immediately?

  1. Chloride 100 mEq/L
  2. Potassium 3.6 mEq/L
  3. Glucose 96 mg/dL
  4. Sodium 118 mEq/L with change in level of consciousness (correct answer)
Explanation: This question tests reduction of risk potential through lab and diagnostic monitoring. The key lab value is sodium 118 mEq/L with altered consciousness, indicating severe hyponatremia risking seizures or coma. The correct answer reflects appropriate clinical judgment within the LPN/VN scope by prioritizing reporting for controlled correction. The distractors are less urgent as potassium 3.6 mEq/L, glucose 96 mg/dL, and chloride 100 mEq/L are normal, a misconception that confusion in alcohol use is always intoxication without electrolyte check. The clinical decision-making process involves linking sodium to neurological symptoms, notifying for hypertonic saline. A transferable strategy is to assess sodium in clients with altered mental status and risk factors. Understanding lab findings like low sodium is crucial in reducing client risk by preventing cerebral edema.

Question 9

A 72-year-old client with chronic atrial fibrillation takes warfarin daily and comes to the clinic for routine INR monitoring. Today the client reports new gum bleeding when brushing teeth; the INR is 5.2 (therapeutic goal 2.0–3.0). Which lab result should the nurse report to the RN immediately?

  1. INR 5.2 with new gum bleeding (correct answer)
  2. Hemoglobin 13.6 g/dL
  3. Platelets 210,000/mm³
  4. Sodium 139 mEq/L
Explanation: This question tests reduction of risk potential through lab and diagnostic monitoring. The key lab value is an INR of 5.2, which is supratherapeutic and indicates an increased risk of bleeding, especially with new gum bleeding symptoms. The correct answer, reporting INR 5.2 with gum bleeding, reflects appropriate clinical judgment within the LPN/VN scope by prioritizing immediate notification to prevent hemorrhage. The distractors are less optimal because hemoglobin 13.6 g/dL, platelets 210,000/mm³, and sodium 139 mEq/L are within normal ranges and do not indicate acute risk, a common misconception being that all lab values require reporting regardless of context. The clinical decision-making process involves assessing the INR against the therapeutic goal, correlating it with bleeding symptoms, and escalating to the RN for potential antidote administration. A transferable strategy is to always compare lab results to reference ranges and clinical symptoms when interpreting coagulation studies. Understanding lab findings like elevated INR is crucial in reducing client risk by enabling timely interventions to prevent life-threatening bleeding.

Question 10

A 67-year-old client is 1 day post–total hip arthroplasty and is being monitored for post-operative bleeding. Morning labs show hemoglobin 7.1 g/dL (down from 11.8 g/dL pre-op) and blood pressure is 88/54 mm Hg with dizziness when sitting up. Which finding indicates the need for immediate intervention?

  1. Incisional pain rated 6/10
  2. Hemoglobin 7.1 g/dL with hypotension and dizziness (correct answer)
  3. Temperature 99.1°F (37.3°C)
  4. Urine output 40 mL/hr
Explanation: This question tests reduction of risk potential through monitoring post-operative bleeding using hemoglobin levels and clinical signs. The hemoglobin of 7.1 g/dL represents a significant drop from pre-operative levels (11.8 g/dL) and combined with hypotension and orthostatic symptoms indicates active bleeding requiring immediate intervention. The correct answer (B) reflects appropriate clinical judgment within LPN/VN scope by recognizing that hemoglobin <8 g/dL with hemodynamic instability requires immediate RN notification for potential blood transfusion. The other options (A: expected post-operative pain, C: low-grade temperature common post-op, D: adequate urine output) represent normal post-operative findings that don't indicate hemorrhage. The clinical decision-making process involves recognizing that a hemoglobin drop >3 g/dL with hypotension indicates significant blood loss. A transferable strategy is to monitor hemoglobin trends post-operatively and correlate with vital signs to detect bleeding. Understanding post-operative hemoglobin monitoring is essential for early detection and treatment of surgical hemorrhage.

Question 11

A 46-year-old client is admitted with pneumonia and has been receiving IV vancomycin; trough monitoring is ordered to reduce toxicity risk. The trough level returns at 24 mcg/mL (facility target 10–20 mcg/mL), and the client reports new ringing in the ears. Which lab result should the nurse report to the RN immediately?

  1. Vancomycin trough of 24 mcg/mL with new tinnitus (correct answer)
  2. WBC 12,000/mm³ with bands consistent with infection
  3. Temperature 100.4°F (38°C) with a mild productive cough
  4. Sodium 136 mEq/L within the normal laboratory range
Explanation: The result to escalate is the vancomycin trough of 24 mcg/mL paired with new tinnitus. The facility target is 10–20 mcg/mL, so this trough is supratherapeutic, and tinnitus is an early sign of vancomycin-induced ototoxicity that can progress to permanent hearing loss if the next dose is given. Reporting it lets the RN hold the dose and notify the prescriber. The other results are expected or non-urgent: a WBC of 12,000/mm³ with bands is a normal leukocytosis with left shift in a client fighting pneumonia; a temperature of 100.4°F (38°C) with a productive cough is the typical low-grade fever of pneumonia, not a toxicity signal; and a sodium of 136 mEq/L is within the normal range and unrelated to vancomycin's renal or auditory toxic effects. Whenever a trough is above target or the client reports ringing, buzzing, or hearing changes, treat it as possible ototoxicity and escalate immediately.

Question 12

A 64-year-old client with heart failure takes furosemide and is seen for routine electrolyte monitoring; the client reports palpitations and leg cramps. Labs show potassium 2.9 mEq/L. The nurse is monitoring due to risk for dysrhythmias from diuretic therapy. Which lab result should the nurse report to the RN immediately?

  1. Chloride 101 mEq/L
  2. Potassium 2.9 mEq/L with palpitations (correct answer)
  3. Magnesium 1.9 mg/dL
  4. Sodium 139 mEq/L
Explanation: This question tests reduction of risk potential through monitoring electrolytes in patients on diuretic therapy. The potassium level of 2.9 mEq/L is critically low (normal 3.5-5.0 mEq/L) and combined with palpitations indicates cardiac effects of hypokalemia requiring immediate intervention. The correct answer (B) reflects appropriate clinical judgment within LPN/VN scope by recognizing that hypokalemia with cardiac symptoms in a heart failure patient requires immediate RN notification for potassium replacement. The other options (A: normal chloride, C: normal magnesium, D: normal sodium) represent stable electrolyte values that don't pose immediate cardiac risk. The clinical decision-making process involves recognizing that hypokalemia increases digoxin toxicity risk and can trigger fatal dysrhythmias in heart failure patients. A transferable strategy is to monitor potassium closely in patients on loop diuretics and correlate levels <3.0 mEq/L with cardiac symptoms. Understanding electrolyte monitoring with diuretic therapy prevents life-threatening dysrhythmias.

Question 13

A 70-year-old client with COPD is on 2 L/min nasal cannula and becomes increasingly drowsy; an ABG is drawn to evaluate ventilation. Results: pH 7.28, PaCO2 62 mm Hg, PaO2 58 mm Hg. Which finding indicates the need for immediate intervention?

  1. PaCO2 62 mm Hg with pH 7.28 and increasing drowsiness (correct answer)
  2. PaO2 58 mm Hg on 2 L/min nasal cannula
  3. Bicarbonate 26 mEq/L
  4. Oxygen saturation 92% earlier in the shift
Explanation: This question tests reduction of risk potential through interpreting arterial blood gases to identify respiratory failure. The pH of 7.28 with PaCO2 of 62 mm Hg indicates acute respiratory acidosis, and the increasing drowsiness suggests CO2 narcosis requiring immediate intervention. The correct answer (A) reflects appropriate clinical judgment within LPN/VN scope by recognizing that respiratory acidosis with altered mental status indicates ventilatory failure requiring immediate RN notification for potential BiPAP or intubation. While option B (hypoxemia) is also concerning, the CO2 retention with mental status changes represents more immediate life-threatening ventilatory failure; options C and D show compensated values. The clinical decision-making process prioritizes CO2 retention with neurological symptoms as indicating impending respiratory arrest. A transferable strategy is to recognize that PaCO2 >50 mm Hg with pH <7.35 and mental status changes indicates acute ventilatory failure. Understanding ABG interpretation in COPD patients prevents respiratory arrest through early intervention.

Question 14

A 41-year-old client with bipolar disorder takes lithium and comes for routine monitoring after starting a thiazide diuretic last week; the client reports nausea, diarrhea, and hand tremors. Lithium level is 1.8 mEq/L (facility therapeutic range 0.6–1.2 mEq/L). Which lab result should the nurse report to the RN immediately?

  1. Sodium 137 mEq/L
  2. Lithium level 1.8 mEq/L with nausea and tremor (correct answer)
  3. Glucose 96 mg/dL
  4. Calcium 9.4 mg/dL
Explanation: This question tests reduction of risk potential through monitoring lithium levels and recognizing drug interactions. The lithium level of 1.8 mEq/L is toxic (therapeutic range 0.6-1.2 mEq/L) and the symptoms of nausea, diarrhea, and tremors confirm lithium toxicity likely precipitated by the thiazide diuretic. The correct answer (B) reflects appropriate clinical judgment within LPN/VN scope by recognizing that lithium toxicity requires immediate RN notification for dose adjustment or discontinuation. The other options (A: normal sodium, C: normal glucose, D: normal calcium) represent stable values unrelated to the presenting toxicity. The clinical decision-making process involves recognizing that thiazide diuretics reduce lithium clearance, causing toxicity even at previously stable doses. A transferable strategy is to monitor lithium levels within 5-7 days of starting any diuretic and recognize early toxicity symptoms. Understanding drug interaction effects on lithium levels prevents progression to severe neurotoxicity.

Question 15

A 58-year-old client with chronic kidney disease is admitted for weakness and missed dialysis; telemetry shows peaked T waves, and the basic metabolic panel shows potassium 6.4 mEq/L and creatinine 5.1 mg/dL. Monitoring is needed due to risk for dysrhythmias. Which finding indicates the need for immediate intervention?

  1. Creatinine 5.1 mg/dL with stable prior baseline
  2. Potassium 6.4 mEq/L with peaked T waves (correct answer)
  3. Sodium 138 mEq/L with weakness and fatigue
  4. BUN 44 mg/dL with a stable baseline
Explanation: Priority goes to the finding that creates the most immediate life threat. A potassium level of 6.4 mEq/L is dangerously elevated, and the peaked T waves on the ECG mean the hyperkalemia is already affecting cardiac conduction. That combination can progress quickly to ventricular dysrhythmia, so it requires immediate intervention. A creatinine of 5.1 mg/dL with a stable prior baseline is an expected finding in chronic kidney disease and is not a new emergency. A sodium of 138 mEq/L is within the normal range, and the associated weakness and fatigue are nonspecific symptoms, not an urgent cardiac finding. A BUN of 44 mg/dL with a stable baseline also reflects stable renal impairment rather than the acute dysrhythmic event. In CKD, the critical step is connecting the potassium level with the ECG: hyperkalemia with peaked T waves is the signal for immediate treatment.

Question 16

A 52-year-old client presents to urgent care with burning on urination and flank discomfort; a urinalysis is ordered to evaluate for infection. Results: nitrites positive, leukocyte esterase positive, and WBC 30–50/hpf; temperature is 101.8°F (38.8°C). The nurse is monitoring to identify worsening infection. The nurse should monitor for which potential complication based on the lab results?

  1. Sepsis (e.g., hypotension, increasing heart rate, confusion) (correct answer)
  2. Hypoglycemia (e.g., tremors, diaphoresis)
  3. Pulmonary embolism (e.g., sudden chest pain, hemoptysis)
  4. Hyperthyroidism (e.g., heat intolerance, exophthalmos)
Explanation: This question tests reduction of risk potential through interpreting urinalysis results to identify urinary tract infection and monitor for complications. The positive nitrites, positive leukocyte esterase, and elevated WBCs confirm bacterial UTI, and the fever of 101.8°F with flank pain suggests pyelonephritis with risk for sepsis progression. The correct answer (A) reflects appropriate clinical judgment within LPN/VN scope by recognizing that UTI with systemic symptoms requires monitoring for sepsis signs (hypotension, tachycardia, altered mental status). The other options are unrelated to UTI complications: B (hypoglycemia unrelated to infection), C (pulmonary embolism not a UTI complication), and D (hyperthyroidism unrelated to acute infection). The clinical decision-making process involves recognizing that pyelonephritis can progress to urosepsis requiring early detection. A transferable strategy is to monitor vital signs and mental status in patients with positive urinalysis and systemic symptoms. Understanding urinalysis interpretation helps identify patients at risk for sepsis from urinary sources.

Question 17

A 62-year-old client with heart failure takes furosemide and is being monitored for electrolyte changes. Morning labs show potassium 2.9 mEq/L; the client reports new muscle cramps. Which lab result should the nurse report to the RN immediately?

  1. Potassium 2.9 mEq/L (correct answer)
  2. Sodium 136 mEq/L
  3. BUN 18 mg/dL
  4. Calcium 9.1 mg/dL
Explanation: This question tests reduction of risk potential through lab and diagnostic monitoring. The key lab value is potassium 2.9 mEq/L, signifying hypokalemia that can lead to muscle weakness and cardiac dysrhythmias. The correct answer reflects appropriate clinical judgment within the LPN/VN scope by identifying the need for prompt reporting and potential supplementation. The distractors are incorrect because sodium 136 mEq/L, BUN 18 mg/dL, and calcium 9.1 mg/dL are normal, a common misconception that diuretic use only affects fluid balance without electrolyte monitoring. The clinical decision-making process includes assessing for symptoms like cramps, correlating with diuretic therapy, and notifying for replacement orders. A transferable strategy is to trend electrolytes in clients on loop diuretics for early imbalance detection. Understanding lab findings like low potassium is vital in reducing client risk by preventing complications in heart failure management.

Question 18

A 74-year-old client with hypertension takes lisinopril. Routine labs today show potassium 5.9 mEq/L and creatinine 2.0 mg/dL; the client reports new weakness. Which lab result should the nurse report to the RN immediately?

  1. Potassium 5.9 mEq/L (correct answer)
  2. Creatinine 2.0 mg/dL
  3. Sodium 138 mEq/L
  4. Calcium 9.3 mg/dL
Explanation: This question tests reduction of risk potential through lab and diagnostic monitoring. The key lab value is potassium 5.9 mEq/L, indicating hyperkalemia exacerbated by ACE inhibitor use, with symptoms like weakness. The correct answer reflects appropriate clinical judgment within the LPN/VN scope by prioritizing reporting to avoid cardiac issues. The distractors are less urgent as creatinine 2.0 mg/dL indicates renal impairment but not immediate threat, and sodium 138 mEq/L and calcium 9.3 mg/dL are normal, a misconception that all changes in renal labs are equally critical. The clinical decision-making process includes assessing for drug-induced imbalances, correlating with symptoms, and notifying for dose adjustments. A transferable strategy is to monitor electrolytes in clients on renin-angiotensin system inhibitors. Understanding lab findings like elevated potassium is vital in reducing client risk by preventing arrhythmias in hypertension management.

Question 19

A 58-year-old client with chronic kidney disease is admitted for weakness and palpitations; telemetry shows peaked T waves. The basic metabolic panel shows potassium 6.4 mEq/L. Which finding indicates the need for immediate intervention?

  1. Chloride 103 mEq/L
  2. Creatinine 2.1 mg/dL
  3. Blood urea nitrogen (BUN) 34 mg/dL
  4. Potassium 6.4 mEq/L with peaked T waves on telemetry (correct answer)
Explanation: This question tests reduction of risk potential through lab and diagnostic monitoring. The key lab value is potassium 6.4 mEq/L with peaked T waves, indicating hyperkalemia that can cause cardiac arrhythmias. The correct answer reflects appropriate clinical judgment within the LPN/VN scope by identifying the urgent need for intervention to stabilize cardiac rhythm. The distractors are less critical as creatinine 2.1 mg/dL and BUN 34 mg/dL suggest chronic kidney issues without immediate threat, and chloride 103 mEq/L is normal, a misconception being that all elevated renal values require equal urgency. The clinical decision-making process involves linking electrolyte imbalances to ECG changes and symptoms like weakness, prioritizing notification for treatments like kayexalate or dialysis. A transferable strategy is to associate hyperkalemia with ECG abnormalities and renal function when interpreting metabolic panels. Understanding lab findings like elevated potassium is vital in reducing client risk by averting cardiac arrest in vulnerable populations.

Question 20

A 56-year-old client receiving chemotherapy reports chills and a sore throat. CBC shows absolute neutrophil count (ANC) 420/mm³ and temperature 101.6°F (38.7°C). Which finding indicates the need for immediate intervention?

  1. ANC 420/mm³ with fever (correct answer)
  2. Hemoglobin 10.8 g/dL
  3. Platelets 165,000/mm³
  4. Sodium 135 mEq/L
Explanation: This question tests reduction of risk potential through lab and diagnostic monitoring. The key finding is ANC 420/mm³ with fever, indicating neutropenia and high infection risk post-chemotherapy. The correct answer reflects appropriate clinical judgment within the LPN/VN scope by identifying the need for isolation and antibiotics. The distractors are less urgent as hemoglobin 10.8 g/dL, platelets 165,000/mm³, and sodium 135 mEq/L are mildly abnormal without symptoms, a misconception that all CBC changes in chemo patients are equivalent. The clinical decision-making process includes calculating ANC, linking to fever, and notifying for sepsis precautions. A transferable strategy is to compute ANC for infection risk assessment in immunocompromised clients. Understanding lab findings like low ANC is crucial in reducing client risk by preventing septic shock in oncology care.