NCLEX Renal Practice Questions with Answers

Mastering the renal system is essential for nursing students, as the kidneys play a critical role in maintaining homeostasis through fluid and electrolyte balance, acid-base regulation, and waste excretion. This guide provides comprehensive NCLEX Renal Practice Questions with Answers designed to sharpen your clinical judgment and prepare you for the rigors of the board exam. By understanding the pathophysiology of conditions like acute kidney injury (AKI) and chronic kidney disease (CKD), you can better anticipate patient needs and prioritize care effectively.

Concept Explanation

Renal nursing care focuses on the physiological processes of filtration, reabsorption, and secretion performed by the functional unit of the kidney, the nephron. The kidneys serve as the body's primary regulatory organs, managing blood pressure via the renin-angiotensin-aldosterone system (RAAS), stimulating red blood cell production through erythropoietin, and activating Vitamin D for calcium absorption. When these functions fail, patients experience systemic complications including hyperkalemia, metabolic acidosis, and fluid volume overload. For those preparing for the exam, integrating these concepts with pharmacology knowledge is vital, as many renal patients require complex medication regimens. Key assessment findings often include changes in glomerular filtration rate (GFR), serum creatinine levels, and urine output, which are the gold standards for evaluating renal health according to the National Kidney Foundation.

Solved Examples

1. Evaluating Laboratory Data: A patient with chronic kidney disease (CKD) has a potassium level of $6.2 \text{ mEq/L}$. What is the priority nursing intervention?
   1. Assess the patient's cardiac rhythm via ECG.
   2. Administer a prescribed dose of sodium polystyrene sulfonate.
   3. Review the patient's dietary intake for high-potassium foods.
   4. Check the patient's most recent creatinine level.
   Solution: The correct answer is 1. Hyperkalemia (potassium > $5.0 \text{ mEq/L}$) can cause life-threatening cardiac arrhythmias. Assessing the heart rhythm is the priority to ensure patient safety before administering treatments.
2. Calculating Fluid Balance: A patient is on a fluid restriction of $1,200 \text{ mL}$ per 24 hours. If the patient consumed $450 \text{ mL}$ during the day shift and $350 \text{ mL}$ during the evening shift, how much can they have during the night shift?
   1. Calculate total consumed: $450 + 350 = 800 \text{ mL}$.
   2. Subtract from total allowance: $1,200 - 800 = 400 \text{ mL}$.
   3. The patient can have $400 \text{ mL}$ during the night shift.
3. Interpreting Urinalysis: A nurse notes a specific gravity of $1.035$ in a patient with acute tubular necrosis. What does this indicate?
   1. Specific gravity measures the concentration of particles in urine.
   2. The normal range is typically $1.005$ to $1.030$.
   3. A value of $1.035$ indicates highly concentrated urine, often seen in dehydration or fluid volume deficit.

Practice Questions

1. A patient with nephrotic syndrome is receiving IV albumin. Which assessment finding indicates the medication is effective?
   • Decreased abdominal girth
   • Increased heart rate
   • Decreased serum sodium
   • Weight gain of 2 lbs
2. The nurse is caring for a patient post-hemodialysis. Which of the following is an expected finding?
   • Slightly increased body temperature
   • Increased blood pressure
   • Weight gain since the start of the procedure
   • A palpable thrill over the AV fistula
3. A patient is diagnosed with calcium oxalate renal calculi. Which dietary instruction should the nurse provide?
   • Increase intake of spinach and rhubarb
   • Limit intake of organ meats and sardines
   • Increase daily fluid intake to 3 liters
   • Decrease intake of dairy products significantly

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4. A nurse is assessing a patient with Acute Kidney Injury (AKI) in the oliguric phase. Which electrolyte abnormality is most likely?
   • Hypokalemia
   • Hypermagnesemia
   • Hypercalcemia
   • Hypophosphatemia
5. Which medication should the nurse clarify with the provider for a patient with a GFR of $25 \text{ mL/min}$?
   • Furosemide
   • Ibuprofen
   • Amlodipine
   • Insulin lispro
6. A patient with polycystic kidney disease (PKD) reports sharp flank pain and hematuria. What is the nurse's priority action?
   • Encourage the patient to ambulate to pass a cyst.
   • Prepare the patient for an immediate nephrectomy.
   • Assess vital signs and pain level.
   • Increase the patient's fluid intake to $4 \text{ L/day}$.
7. A nurse is reviewing the lab results for a patient with CKD. Which finding is consistent with secondary hyperparathyroidism?
   • High serum calcium and high phosphorus
   • Low serum calcium and high phosphorus
   • Low serum calcium and low phosphorus
   • High serum calcium and low phosphorus
8. During the first hour of peritoneal dialysis, the patient complains of abdominal pain. What should the nurse do first?
   • Stop the infusion immediately.
   • Slow the rate of the dialysate infusion.
   • Check the effluent for cloudiness.
   • Notify the healthcare provider.

Answers & Explanations

1. Answer: Decreased abdominal girth. Albumin increases oncotic pressure, pulling fluid from the interstitial space back into the vascular compartment. In nephrotic syndrome, this helps reduce edema and ascites, leading to a decrease in abdominal girth.
2. Answer: A palpable thrill over the AV fistula. A thrill (vibration) and bruit (whooshing sound) are normal findings that indicate the fistula is patent. Blood pressure usually decreases after dialysis due to fluid removal.
3. Answer: Increase daily fluid intake to 3 liters. High fluid intake dilutes the urine and prevents the crystallization of minerals, which is the most effective way to prevent all types of kidney stones. For more complex calculations involving patient fluids, see our guide on IV flow rate practice.
4. Answer: Hypermagnesemia. In the oliguric phase of AKI, the kidneys cannot excrete magnesium, potassium, or phosphorus, leading to elevated levels. Calcium levels typically drop (hypocalcemia) as phosphorus rises.
5. Answer: Ibuprofen. NSAIDs like ibuprofen are nephrotoxic and can further decrease renal perfusion by inhibiting prostaglandins. They should be avoided in patients with significant renal impairment (GFR < 30). This is a common topic in medication safety questions.
6. Answer: Assess vital signs and pain level. Hematuria and sharp pain in PKD usually indicate a ruptured cyst or a stone. Initial assessment of stability and pain severity is the first step in the nursing process.
7. Answer: Low serum calcium and high phosphorus. In CKD, the kidneys fail to excrete phosphorus and fail to activate Vitamin D. High phosphorus binds to calcium, and low Vitamin D prevents calcium absorption, leading to hypocalcemia, which triggers the parathyroid glands.
8. Answer: Slow the rate of the dialysate infusion. Abdominal pain during the initial "fill" phase is common and often caused by the temperature or speed of the fluid. Slowing the rate usually alleviates the discomfort. If pain persists or fluid is cloudy (sign of peritonitis), further action is needed.

1. Which laboratory value is the most sensitive indicator of renal function?

• ABlood Urea Nitrogen (BUN)
• BSerum Creatinine
• CUrine Specific Gravity
• DSerum Potassium

Frequently Asked Questions

What is the difference between AKI and CKD for the NCLEX?

Acute Kidney Injury (AKI) is a sudden, often reversible reduction in kidney function, whereas Chronic Kidney Disease (CKD) is a progressive, irreversible loss of function over months or years. On the NCLEX, focus on the causes of AKI (prerenal, intrarenal, postrenal) and the stages of CKD based on GFR.

Why is hyperkalemia so dangerous in renal patients?

The kidneys are responsible for excreting 90% of the body's potassium, so renal failure leads to rapid accumulation. High potassium levels interfere with cardiac electrical conduction, potentially causing ventricular fibrillation or asystole.

How do I calculate a patient's fluid restriction allowance?

Standard practice often involves taking the previous day's total urine output and adding $500 \text{ to } 600 \text{ mL}$ to account for insensible losses (sweat, respiration). You can practice similar math in our dosage calculation section.

What are the signs of peritonitis in a dialysis patient?

The hallmark signs of peritonitis in peritoneal dialysis patients include cloudy dialysate effluent, abdominal pain, rebound tenderness, and fever. According to the CDC, maintaining sterile technique during connections is the best prevention.

What is the "disequilibrium syndrome" in hemodialysis?

Disequilibrium syndrome is a rare but serious complication occurring during or after dialysis when solutes are removed from the blood faster than from the brain cells. This causes cerebral edema, leading to symptoms like headache, nausea, confusion, and seizures.