Medium NCLEX Renal Practice Questions

Concept Explanation

NCLEX Renal practice questions focus on the kidney's role in maintaining homeostasis through filtration, fluid and electrolyte balance, acid-base regulation, and hormone production. The renal system is a critical component of the NCLEX Med Surg curriculum because it affects nearly every other body system, particularly the cardiovascular and hematologic systems. To succeed on medium-level renal questions, you must understand the pathophysiology of Acute Kidney Injury (AKI), Chronic Kidney Disease (CKD), and the nursing implications of renal replacement therapies like hemodialysis and peritoneal dialysis.

The kidneys filter approximately 180 liters of plasma daily, yet only about 1 to 2 liters are excreted as urine. This process involves the nephron, where glomerular filtration, tubular reabsorption, and tubular secretion occur. When these processes fail, waste products like urea and creatinine accumulate in the blood, leading to azotemia. Nurses must monitor glomerular filtration rate (GFR) as the gold standard for assessing renal function, alongside serum creatinine and Blood Urea Nitrogen (BUN) levels. You can use our AI Flashcard Generator to memorize these lab values and their clinical significance.

Key nursing priorities for renal patients include monitoring for fluid volume excess—characterized by edema, hypertension, and crackles in the lungs—and managing life-threatening electrolyte imbalances, specifically hyperkalemia. According to the National Kidney Foundation, early detection of kidney disease can significantly improve long-term outcomes and delay the progression to end-stage renal disease (ESRD).

Solved Examples

1. Determining Fluid Status: A patient with CKD presents with a weight gain of 2 kg over 24 hours. How much fluid has this patient likely retained?
   1. Recall the conversion factor: $1 \text{ kg} = 1,000 \text{ mL}$ (1 liter) of fluid.
   2. Multiply the weight gain by the conversion factor: $2 \text{ kg} \times 1,000 \text{ mL/kg} = 2,000 \text{ mL}$.
   3. Conclusion: The patient has retained approximately 2,000 mL of fluid.
2. Interpreting Lab Values: A nurse reviews the labs for a patient with AKI: Potassium $6.2 \text{ mEq/L}$, Creatinine $3.4 \text{ mg/dL}$, and BUN $50 \text{ mg/dL}$. Which value is the highest priority?
   1. Identify the normal ranges: Potassium ($3.5 \text{--} 5.0 \text{ mEq/L}$), Creatinine ($0.6 \text{--} 1.2 \text{ mg/dL}$), BUN ($10 \text{--} 20 \text{ mg/dL}$).
   2. Assess the risk: While all are elevated, hyperkalemia ($> 6.0 \text{ mEq/L}$) poses an immediate risk for lethal cardiac arrhythmias.
   3. Action: Notify the provider immediately for potential orders of calcium gluconate or insulin with dextrose.
3. Medication Safety: A patient with a GFR of $25 \text{ mL/min}$ is scheduled for a CT scan with intravenous contrast. What is the nurse's priority action?
   1. Recognize that a GFR below $60 \text{ mL/min}$ indicates renal impairment.
   2. Identify that IV contrast is nephrotoxic and can cause Contrast-Induced Nephropathy (CIN).
   3. Action: Hold the procedure and contact the provider to discuss alternative imaging or pre-procedure hydration protocols.

Practice Questions

1. A nurse is caring for a patient with Chronic Kidney Disease (CKD) who is prescribed epoetin alfa. Which assessment finding indicates the medication is achieving the desired therapeutic effect?

2. A patient with Acute Kidney Injury (AKI) is in the oliguric phase. The nurse should expect to find which of the following electrolyte abnormalities?

3. A nurse is performing an assessment on a patient who just returned from a hemodialysis session. Which finding requires immediate intervention?

4. A patient receiving peritoneal dialysis reports that the outflow is cloudy. What should be the nurse's first action?

5. Which dietary instruction is most appropriate for a patient with Stage 4 CKD who is not yet on dialysis?

6. A nurse is assessing an arteriovenous (AV) fistula in a patient's left arm. Which of the following findings is considered normal?

7. A patient with nephrotic syndrome is experiencing severe generalized edema. Which laboratory result would the nurse expect to see?

8. A nurse is caring for a patient with a history of calcium oxalate renal calculi. Which instruction should be included in the discharge teaching?

9. A patient is diagnosed with prerenal Acute Kidney Injury. The nurse understands that this condition is most likely caused by which of the following?

10. Following a renal biopsy, which nursing intervention is the highest priority for the first 24 hours?

Answers & Explanations

1. Answer: An increase in Hematocrit/Hemoglobin levels. Epoetin alfa stimulates the bone marrow to produce red blood cells, which the kidneys normally do by releasing erythropoietin. Patients with CKD often have anemia due to decreased erythropoietin production. For more on hematologic interventions, see our NCLEX Hematology Practice Questions.
2. Answer: Hyperkalemia and Hypermagnesemia. During the oliguric phase of AKI, the kidneys cannot excrete potassium, magnesium, or phosphorus, leading to elevated serum levels. Conversely, sodium may be low due to dilutional hyponatremia.
3. Answer: A blood pressure of $88/52 \text{ mmHg}$. Hemodialysis involves the rapid removal of fluid, which can lead to hypotension. While mild fatigue is expected, significant hypotension indicates a compromise in cardiac output and requires immediate fluid resuscitation or Trendelenburg positioning.
4. Answer: Obtain a sample of the drainage for culture and sensitivity. Cloudy dialysate outflow is the earliest sign of peritonitis, a serious complication of peritoneal dialysis. The nurse must also notify the provider, but securing a sample for diagnosis is a priority.
5. Answer: Limit protein intake to $0.6 \text{--} 0.8 \text{ g/kg}$ of body weight. Before dialysis begins, protein is restricted to slow the buildup of nitrogenous wastes. Once dialysis starts, protein intake is usually increased to replace amino acids lost during the procedure.
6. Answer: Presence of a palpable thrill and audible bruit. A thrill (vibration) and bruit (whooshing sound) indicate that the fistula is patent and has high-pressure blood flow necessary for dialysis. You can practice recognizing these physical assessment markers with our Retrieval Challenge tool.
7. Answer: Serum albumin $2.2 \text{ g/dL}$ (Low). Nephrotic syndrome is characterized by massive proteinuria, which leads to hypoalbuminemia. This decrease in oncotic pressure causes fluid to leak into the interstitial space, resulting in edema.
8. Answer: Increase daily fluid intake to at least 2 to 3 liters. High fluid intake dilutes the urine and prevents the crystallization of minerals that form stones. Patients should also limit high-oxalate foods like spinach and rhubarb.
9. Answer: Severe dehydration or massive hemorrhage. Prerenal AKI is caused by factors that reduce systemic circulation, causing a decrease in renal blood flow. This is distinct from intrarenal (direct damage to tissue) or postrenal (obstruction). This concept is also covered in NCLEX Fluid Balance Practice Questions.
10. Answer: Monitoring for signs of internal bleeding (flank pain, decreased BP). The kidneys are highly vascular. A biopsy carries a significant risk of hemorrhage. The nurse must monitor the puncture site and vital signs frequently.

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

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

Frequently Asked Questions

What is the difference between AKI and CKD?

Acute Kidney Injury (AKI) is a sudden, often reversible loss of kidney function usually caused by an acute event like dehydration or infection. Chronic Kidney Disease (CKD) is a progressive, irreversible loss of function lasting more than three months, often linked to long-term conditions like diabetes or hypertension.

Why is hyperkalemia so dangerous in renal patients?

Hyperkalemia is dangerous because the heart's electrical conduction system is highly sensitive to potassium levels. Excess potassium can lead to peaked T-waves, widened QRS complexes, and ultimately life-threatening ventricular fibrillation or asystole.

How do ACE inhibitors affect the kidneys?

ACE inhibitors can be "kidney-protective" in early CKD by reducing intraglomerular pressure and proteinuria. However, in patients with advanced renal failure or renal artery stenosis, they can acutely decrease GFR and increase potassium levels, requiring careful monitoring.

What is "renal diet" exactly?

A renal diet typically involves restricting sodium, potassium, and phosphorus to prevent the accumulation of these substances. Fluid restriction is also common, especially for patients on hemodialysis who no longer produce significant amounts of urine.

Why is anemia common in patients with kidney failure?

Anemia occurs because the kidneys are responsible for producing erythropoietin, a hormone that signals the bone marrow to create red blood cells. When renal tissue is damaged, erythropoietin production drops, leading to a lower red blood cell count.