Nursing Fundamentals NCLEX Practice Questions: 20 High-Yield Scenarios with Rationales
Free 20-question nursing fundamentals NCLEX practice set with detailed rationales on burns, DKA, IV potassium, warfarin, COPD, dialysis, insulin, CVC care.
Nursing Fundamentals NCLEX Practice Questions: 20 High-Yield Scenarios with Rationales
Nursing fundamentals questions test whether you can make safe, priority-based decisions at the bedside, and this free 20-question NCLEX practice set covers every high-yield topic you need to master before exam day. Work through medication safety, fluid resuscitation, diabetes emergencies, oxygen therapy, dialysis complications, postoperative drains, anticoagulants, and central line complications. Every question includes a detailed rationale that explains why the correct answer is right, why each distractor is wrong, and the key clinical concept behind it — so you understand the reasoning, not just the answer. No signup required.
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Question 1: Burns / Fluid Resuscitation
A nurse is caring for an adult client with severe burns involving 40% of the total body surface area. Lactated Ringer’s solution is infusing according to the Parkland formula during the first 24 hours after the burn injury. Which assessment finding is the priority indicator of effective fluid resuscitation?
The correct answer is urine output of 30 to 50 mL/hr. In an adult with major burns, this finding shows that the kidneys are being perfused and that circulating blood volume is likely adequate.
Use the clinical judgment idea of recognizing the most important cue: during the first 24 hours after a major burn, the nurse must monitor for signs that fluid resuscitation is working. Urine output is one of the most useful bedside indicators of perfusion.
Major burns cause capillary leak, which pulls fluid out of the bloodstream and into the tissues. This can lead to hypovolemia, decreased cardiac output, and decreased renal blood flow.
Clinical pearl: In adult burn resuscitation, low or falling urine output is an early warning sign of inadequate fluid replacement and possible burn shock.
Pain rated 8/10 is important and should be treated, but it is not the best measure of fluid resuscitation. Perfusion takes priority over comfort during the emergent resuscitation phase.
Question 2: Diabetic Ketoacidosis / IV Insulin
A nurse is caring for a client admitted with diabetic ketoacidosis who is receiving a continuous IV insulin infusion. The client's blood glucose has decreased to 250 mg/dL , but the anion gap remains elevated. Which action should the nurse take first?
The correct action is to add dextrose-containing IV fluids as prescribed and continue insulin therapy per protocol. In DKA, insulin is needed to stop ketone production and close the anion gap, not just to lower the blood glucose.
This is a take-action priority question: the nurse must use the lab cues to choose the safest next step. The glucose is improving, but the elevated anion gap shows that ketoacidosis is not resolved.
Insulin drives glucose into cells and also suppresses fat breakdown, which reduces ketone formation. When glucose falls to about 200 to 250 mg/dL, dextrose is added so insulin can continue without causing hypoglycemia.
Clinical pearl: In DKA, do not stop insulin just because the glucose looks better. The anion gap and acidosis must resolve.
The tempting distractor is continuing insulin without adding dextrose. That would treat the ketones but puts the client at high risk for hypoglycemia.
Question 3: Post-Mastectomy / JP Drain
A nurse is caring for a client in the early postoperative period after a mastectomy. The client has a Jackson-Pratt drain, and the drainage suddenly changes to a large amount of bright-red blood. Which action should the nurse take first?
The priority action is to assess the client’s vital signs and notify the healthcare provider. A sudden large amount of bright-red drainage after surgery is not expected and may mean active bleeding.
The clinical reasoning framework is circulation first: determine whether the client is becoming unstable, then escalate care promptly. Tachycardia, hypotension, pallor, restlessness, or decreasing level of consciousness can indicate blood loss.
A Jackson-Pratt drain should be monitored for amount, color, and sudden changes. Drainage may be bloody or serosanguineous early after surgery, but a sudden increase in bright-red output is a warning sign.
The tempting distractor is routine drain care. Emptying and documenting the output is appropriate after the client is assessed and the concern is addressed, but it is not enough during possible hemorrhage.
Question 4: Warfarin / Elevated INR
A nurse is caring for a client who is receiving warfarin . The morning laboratory results show an INR of 4.5 . Which action should the nurse take first?
The correct action is to withhold the warfarin dose and notify the healthcare provider. An INR of 4.5 means the blood is taking too long to clot, which increases the risk for serious bleeding.
The clinical judgment step is analyze cues: the nurse must recognize that the INR is too high, connect it to excessive anticoagulation, and choose the safest action.
Warfarin works by reducing vitamin K-dependent clotting factors, so too much anticoagulant effect can lead to prolonged bleeding, bruising, hematuria, melena, or intracranial bleeding.
Clinical pearl: for warfarin, a high INR means high bleeding risk. Do not give the next dose when the INR is dangerously elevated unless the provider specifically directs it.
The most tempting distractor is monitoring for bleeding only. Monitoring is important, but it does not prevent the next dose from worsening the problem.
Question 5: IV Potassium Chloride
A nurse is caring for a client receiving intravenous potassium chloride through a peripheral IV line. The client reports burning and pain at the IV site. Which action should the nurse take first?
The correct action is to stop the infusion and assess the IV site. Burning or pain during peripheral potassium chloride administration may mean the vein is irritated or the fluid is infiltrating into surrounding tissue.
This is a safety and medication-administration priority: stop the potential source of injury first, then assess before deciding what to do next.
Potassium chloride is irritating to veins because it is a concentrated electrolyte solution. If it leaks out of the vein, it can cause inflammation, tissue injury, and severe discomfort.
- Clinical pearl: pain, burning, swelling, redness, coolness, leaking, or firmness at an IV site requires prompt assessment.
- Never continue an irritant IV medication through a painful site without checking patency.
The tempting distractor is slowing the infusion rate. Slowing may help irritation only after the IV site is confirmed to be safe, but it does not protect the client if infiltration or extravasation is occurring.
Question 6: Calcium Channel Blocker / Hypotension
A nurse is preparing to administer a prescribed calcium channel blocker to a client with hypertension. The client’s blood pressure is 90/60 mm Hg . Which action should the nurse take first?
The correct action is to hold the medication and notify the healthcare provider. A blood pressure of 90/60 mm Hg is low, and a calcium channel blocker can lower it further.
This is a medication safety question. The nurse uses the Nursing Process: assess the vital sign, recognize that giving the medication may cause harm, hold the dose, and report the finding.
Calcium channel blockers reduce calcium entry into vascular smooth muscle and cardiac cells. This can cause vasodilation, decreased blood pressure, and, with some agents, slower heart rate or decreased contractility.
Clinical pearl: check blood pressure before giving antihypertensives. A low blood pressure before the dose is a warning sign to hold the medication and clarify the plan.
The tempting distractor is to recheck the blood pressure after giving the medication, but that is unsafe. The nurse should not give a medication that may worsen hypotension and then wait to see what happens.
Question 7: COPD / Bronchodilator Priority
A nurse is caring for a client with chronic obstructive pulmonary disease who is receiving prescribed oxygen therapy. The client has diffuse wheezing, increased work of breathing, a respiratory rate of 24 breaths/min, and an oxygen saturation of 88%. Which action should the nurse take first?
The priority action is to administer the prescribed bronchodilator. Wheezing and increased work of breathing mean the client’s airways are narrowed, so the nurse must help open the airways.
This is an ABCs question. The breathing problem is not just low oxygen; it is poor airflow from bronchospasm or obstruction, so improving ventilation comes first.
Bronchodilators relax airway smooth muscle, widen the bronchi, and reduce airflow resistance. This helps the client move air more effectively and may improve the oxygen saturation.
Clinical pearl: many clients with COPD have an ordered oxygen saturation target around 88% to 92%. Do not automatically increase oxygen to a high flow rate without considering the order, the target saturation, and signs of carbon dioxide retention.
The tempting distractor is increasing oxygen. Oxygen may be needed if the client remains hypoxemic, but it does not fix wheezing from bronchospasm and can be harmful if given too aggressively in susceptible clients with COPD.
Question 8: Digoxin / Hypokalemia
A nurse is preparing to administer digoxin to an adult client. The client’s serum potassium level is 2.8 mEq/L . Which action should the nurse take?
The correct action is to hold the digoxin and notify the healthcare provider. A potassium level of 2.8 mEq/L is low, and low potassium makes digoxin more likely to cause toxicity and dangerous dysrhythmias.
The clinical reasoning is medication safety: before giving a high-risk medication, the nurse must analyze the client’s assessment data and lab values. If a finding makes the medication unsafe, the nurse holds the drug and reports the finding.
Digoxin increases cardiac contractility by affecting sodium-potassium exchange in heart cells. When potassium is low, digoxin has a stronger effect on the myocardium, which increases the risk for bradycardia, heart block, and other dysrhythmias.
Clinical pearl: before administering digoxin, check the apical pulse and review potassium and other relevant labs. Warning signs of toxicity include nausea, vomiting, anorexia, confusion, visual changes, and dysrhythmias.
The tempting error is to give the medication anyway or give it with food. Food may help with mild stomach upset, but it does not fix hypokalemia or reduce the risk of digoxin toxicity.
Question 9: Post-Dialysis Symptoms
A nurse is caring for a client with end-stage kidney disease who has just returned from hemodialysis. The client reports dizziness, weakness, and nausea. Which action should the nurse take first?
The priority action is to check the client’s blood pressure and heart rate. Dizziness, weakness, and nausea after hemodialysis can be early signs of hypotension from rapid fluid removal.
This question uses the nursing process: assess before treating symptoms or notifying the provider. Vital signs give objective data about perfusion and guide the next intervention.
During dialysis, fluid is removed from the bloodstream. If too much fluid is removed or fluid shifts too quickly, circulating volume can drop, leading to low blood pressure, dizziness, nausea, and weakness.
Clinical pearl: symptoms after dialysis should be treated as possible hemodynamic instability until vital signs prove otherwise. A symptomatic client should not be allowed to stand or ambulate until assessed.
The most tempting distractor is giving an antiemetic, but that treats only nausea. It does not identify or address the possible cause: decreased blood pressure and reduced perfusion.
Question 10: Prednisone Teaching
A nurse is providing discharge teaching to a client who has been prescribed oral prednisone for an autoimmune condition. Which instruction should the nurse include?
The correct instruction is to take prednisone with food to reduce stomach irritation. Prednisone is a systemic corticosteroid that can irritate the gastrointestinal tract and increase the risk of dyspepsia, nausea, or epigastric discomfort.
This question uses a medication-safety framework: choose the teaching that helps the client take the drug safely and prevent a common adverse effect. For oral corticosteroids, safe teaching includes taking the medication with food, monitoring blood glucose, watching for signs of infection, and avoiding abrupt discontinuation.
The key mechanism is that prednisone provides glucocorticoid effects and suppresses inflammation and immune activity. With ongoing use, it can also suppress the body’s normal adrenal cortisol production.
Clinical pearl: a client who has taken prednisone for more than a short course should not stop it suddenly unless instructed, because abrupt withdrawal can cause adrenal insufficiency.
The most tempting distractor is stopping the medication when symptoms improve, but symptom relief does not mean adrenal function has recovered or that the autoimmune condition is controlled.
Question 11: Heart Failure / Diuretic / Hypokalemia
A nurse is preparing to administer a prescribed loop diuretic to a client with chronic heart failure. The client’s serum potassium level is 3.0 mEq/L . Which action should the nurse take first?
The correct action is to hold the diuretic and notify the healthcare provider. A potassium level of 3.0 mEq/L is low, and loop diuretics can lower potassium even more.
This is a medication safety priority: assess the relevant lab, recognize the risk, and prevent harm before giving the medication. In heart failure, hypokalemia is especially concerning because it increases the risk for cardiac dysrhythmias.
Loop diuretics increase sodium and water loss in the kidneys, but they also increase potassium loss in the urine. Less potassium means cardiac cells may become more electrically unstable.
Clinical pearl: before giving potassium-wasting diuretics, check potassium and report significant hypokalemia. Low potassium plus heart disease can become a rhythm problem.
The tempting mistake is to give the medication because the client has heart failure and needs diuresis. However, giving it now could worsen the electrolyte imbalance and create a more immediate safety risk.
Question 12: Warfarin / Bruising
A nurse is caring for a client prescribed warfarin. The client’s INR is 2.8, and the client reports new spontaneous bruising with small hematomas. Which intervention is the nurse’s priority?
The priority action is to hold the warfarin dose and notify the healthcare provider. New spontaneous bruising and hematomas are warning signs of bleeding, even if the INR is within the expected therapeutic range for many conditions.
This question uses the NCJMM take-action step: the nurse must choose the safest immediate action after recognizing a possible adverse medication effect.
Warfarin decreases production of vitamin K–dependent clotting factors, so blood takes longer to clot. Excess anticoagulation or increased sensitivity to the medication can lead to bruising, hematomas, bleeding gums, hematuria, or black stools.
- Key clinical pearl: assess the client, hold the dose if bleeding is suspected, and report the finding for further orders.
- Do not rely on the INR alone; client symptoms can signal bleeding risk before a critical lab value appears.
The most tempting distractor is giving vitamin K. Vitamin K may be used for reversal, but it is not given automatically without a prescription or protocol, especially when major bleeding has not been established.
Question 13: Laparoscopic Cholecystectomy / Shoulder Pain
A nurse is caring for a client who had a laparoscopic cholecystectomy earlier today. The client reports mild shoulder discomfort and has no signs of acute distress. Which nursing intervention is most appropriate?
The correct answer is to encourage ambulation as tolerated. Mild shoulder pain after laparoscopic surgery is usually caused by leftover CO2 gas irritating the diaphragm, which can cause referred pain to the shoulder.
The nurse uses the nursing process to recognize this as an expected postoperative finding and choose a safe comfort intervention. Walking helps the body move and absorb the gas, promotes circulation, and supports bowel motility.
The key clinical pearl is this: mild shoulder pain after laparoscopy is expected, but severe or worsening pain is not. Report pain that is intense, persistent, or accompanied by fever, abdominal rigidity, bleeding, vomiting, jaundice, or respiratory distress.
The most tempting distractor is notifying the surgeon immediately. That would be appropriate if there were signs of a complication, but mild shoulder discomfort alone after laparoscopy is usually managed with ambulation, comfort measures, and prescribed analgesics if needed.
Question 14: Heparin / Therapeutic aPTT
A nurse is caring for a client receiving a continuous heparin infusion for deep vein thrombosis. The client's aPTT is 80 seconds, and the facility's therapeutic range is 60 to 80 seconds. Which action should the nurse take?
The correct action is to continue the heparin infusion at the current rate because the client's aPTT is within the facility's therapeutic range.
The clinical reasoning is analyze the cue, then act by protocol: compare the lab result with the ordered therapeutic range before changing the infusion.
Heparin works by enhancing antithrombin activity, which reduces clotting factor activity and prevents the clot from getting larger. The aPTT is used to monitor the anticoagulant effect of unfractionated heparin.
Clinical pearl: a therapeutic aPTT means the nurse usually maintains the infusion and continues monitoring for bleeding, not automatically lowers the dose because the value is near the upper limit.
The tempting distractor is to decrease the rate, but that would be unnecessary here and could make anticoagulation too low, increasing the risk of clot progression.
Question 15: Multiple Sclerosis / Lifestyle Teaching
A nurse is providing teaching to a client who has a new diagnosis of multiple sclerosis. Which lifestyle instruction should the nurse include?
The correct teaching is to stay active with a regular exercise program based on tolerance. In multiple sclerosis, regular activity helps maintain strength, balance, mobility, mood, and independence.
This question uses the generate-solutions step of clinical judgment: the nurse selects the health teaching that best supports long-term function and safety.
MS causes demyelination in the central nervous system. Because damaged nerve pathways conduct signals less efficiently, symptoms such as weakness, fatigue, numbness, and visual changes can occur.
A key clinical pearl is that heat can temporarily worsen MS symptoms in some clients. Teach activity pacing, rest periods, hydration, and cooling strategies.
The most tempting wrong idea is to avoid activity to prevent fatigue. That increases deconditioning and weakness; the safer approach is activity as tolerated with planned rest.
Question 16: Alcohol Withdrawal
A nurse is caring for a client admitted with alcohol withdrawal. The client becomes increasingly agitated and anxious and has visible tremors. Which action should the nurse take first?
The priority action is to give the prescribed benzodiazepine. The client’s increasing agitation, anxiety, and tremors show worsening alcohol withdrawal, which can progress to seizures and delirium tremens.
This is a take-action priority question. The safest first step is the intervention that prevents life-threatening complications, not the intervention that only provides comfort.
Alcohol withdrawal occurs because the brain has adapted to alcohol’s depressant effects. When alcohol is stopped, the nervous system becomes overactive; benzodiazepines calm this overactivity by enhancing GABA, the major inhibitory neurotransmitter.
Clinical pearl: worsening tremors, agitation, confusion, hallucinations, or autonomic instability can signal severe withdrawal and require prompt treatment and close monitoring.
The most tempting distractor is offering snacks and fluids. Hydration and nutrition matter, but they do not prevent withdrawal seizures or delirium tremens when symptoms are escalating.
Question 17: Chemotherapy / Nausea
A nurse is caring for a client receiving chemotherapy for breast cancer. The client reports nausea and requests medication. Which action should the nurse take first?
The correct action is to administer the prescribed antiemetic. Chemotherapy-induced nausea can become severe, so early treatment helps prevent dehydration, poor intake, and interruption of cancer therapy.
The priority framework is the nursing process: the nurse assesses the symptom, implements the prescribed treatment, and then evaluates the client’s response. Because the client has an active symptom and an ordered medication is available, delaying medication is not appropriate.
Chemotherapy can stimulate nausea pathways in the gastrointestinal tract and central nervous system, including serotonin-mediated signals from the gut. Antiemetics help block these pathways and reduce nausea and vomiting.
Clinical pearl: treat chemotherapy-related nausea early rather than waiting for vomiting to occur. Persistent vomiting, inability to keep fluids down, dizziness, decreased urine output, or signs of dehydration require prompt follow-up.
The most tempting distractor is offering fluids. Fluids are helpful for hydration, but they do not control active chemotherapy-induced nausea as effectively as the prescribed antiemetic.
Question 18: Hemodialysis / Intradialytic Hypotension
A client with chronic kidney disease is receiving hemodialysis and reports sudden weakness and nausea during the treatment. Which action should the nurse take first?
The priority action is to check the client’s blood pressure and heart rate. Sudden weakness and nausea during hemodialysis can be early signs of intradialytic hypotension.
The clinical reasoning framework is the nursing process: assess first, then intervene. Objective vital signs tell the nurse whether the client is becoming unstable and whether dialysis settings or other interventions are needed.
The key mechanism is rapid fluid removal. If fluid is removed faster than the vascular space can refill, circulating volume falls, venous return decreases, and blood pressure can drop.
Clinical pearl: during dialysis, sudden weakness, nausea, dizziness, diaphoresis, cramping, or confusion should prompt an immediate blood pressure check.
The tempting distractor is stopping dialysis immediately. Dialysis may need to be adjusted or stopped if hypotension is confirmed, but the nurse should obtain assessment data first unless the client is in obvious life-threatening distress.
Question 19: Type 1 Diabetes / Insulin Teaching
A nurse is teaching a client newly diagnosed with type 1 diabetes mellitus about self-administration of insulin. Which instruction is most important for the nurse to include?
The correct answer is to rotate injection sites. Repeated insulin injections in the same spot can damage subcutaneous tissue and cause lipodystrophy, which can make insulin absorption unpredictable.
This question uses the nursing process step of implementation: the nurse must choose the safest medication-teaching instruction. Safe insulin teaching focuses on the right site, right timing, right storage, and regular blood glucose monitoring.
Insulin is absorbed through subcutaneous tissue. If that tissue becomes thickened, scarred, or pitted, the same dose may work too slowly, too quickly, or inconsistently.
Clinical pearl: teach clients to rotate injections in an organized pattern and avoid injecting into areas that are hard, tender, bruised, scarred, or thickened.
The most tempting distractor is taking insulin only after meals, but insulin timing depends on the type. Rapid-acting insulin is commonly given before or with meals, while basal insulin is given on a schedule and is not based only on meal timing.
Question 20: Central Venous Catheter / Early Complication
A nurse is caring for a client during the first 24 hours after insertion of a central venous catheter. Which complication should the nurse assess for first?
The correct answer is pneumothorax. A newly inserted central venous catheter can accidentally puncture the pleura, allowing air to enter the pleural space and collapse part of the lung.
This question uses the ABCs and recognize-cues reasoning: after central line placement, the nurse must watch for complications that affect breathing first.
- Key warning signs: sudden shortness of breath, chest pain, decreased breath sounds, restlessness, tachycardia, or oxygen desaturation.
- Clinical pearl: pneumothorax is most associated with chest/neck central line access, especially subclavian and internal jugular sites.
Hypertension may occur from pain or anxiety, but it is not a typical direct complication of central venous catheter insertion. Electrolyte or glucose changes are not the priority concern immediately after catheter placement unless another condition or therapy explains them.
Great job working through these NCLEX-style questions. Review the rationales carefully, especially the priority-thinking patterns:
- Assess before acting when the client may be unstable.
- Hold medications when assessment data shows danger.
- Prioritize airway, breathing, circulation, perfusion, and safety.
- Watch for medication complications.
- Know expected vs unexpected postoperative findings.
Key Takeaways From These Nursing Fundamentals NCLEX Questions
- Nursing fundamentals NCLEX questions often test priority decision-making, not just memorization.
- Always connect the client’s symptoms to airway, breathing, circulation, perfusion, and safety.
- For medication questions, know when to hold a drug, check labs, assess vital signs, or notify the provider.
- High-risk medications like warfarin, heparin, digoxin, insulin, potassium chloride, and antihypertensives require careful safety checks before administration.
- Fluid balance questions often focus on urine output, blood pressure, heart rate, electrolytes, and signs of dehydration or overload.
- Postoperative and device-related questions test whether you can recognize expected findings vs warning signs, such as bleeding, infection, pneumothorax, or IV infiltration.
- The safest NCLEX answer is usually the one that prevents the most immediate harm to the client.
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