KAPLAN FLUID AND ELECTROLYTE EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF
Core Domains
Fluid Volume Balance (Deficit & Excess)
Electrolyte Imbalances (Sodium, Potassium, Calcium, Magnesium, Phosphorus)
Acid-Base Balance & ABG Interpretation
IV Fluid Types & Clinical Applications
Third-Spacing & Capillary Permeability
Renal Regulation of Fluids and Electrolytes
Nursing Interventions for Fluid/Electrolyte Disturbances
Pharmacological Management (Diuretics, Electrolyte Replacement)
Clinical Assessment & Monitoring Strategies
Ethics, Legal Compliance, and Professional Standards in Fluid Management
Introduction
This exam is designed to assess comprehensive knowledge and clinical decision-making skills related to fluid and electrolyte balance in adult and
pediatric patients. It evaluates the candidate's ability to recognize signs of fluid volume deficits and excesses, identify electrolyte imbalances,
interpret arterial blood gases, select appropriate IV fluids, and implement evidence-based nursing interventions. The assessment uses multiple-
choice and scenario-based questions that emphasize real-world application, critical thinking, and prioritization in clinical settings. Success on this
exam demonstrates readiness to manage complex fluid/electrolyte cases safely and effectively while adhering to regulatory and ethical standards.
Section One: Questions 1–100
Question 1
A patient with severe vomiting presents with pH 7.50, PaCO₂ 49 mmHg, and HCO₃⁻ 38 mEq/L. Which acid-base imbalance is most likely?
,A. Respiratory acidosis
B. Respiratory alkalosis
C. Metabolic alkalosis
D. Metabolic acidosis
🟢 Correct answer: C
🔴 RATIONALE: Severe vomiting causes loss of hydrochloric acid from the stomach, leading to metabolic alkalosis. The elevated pH and high
HCO₃⁻ confirm this diagnosis, while the elevated PaCO₂ represents compensatory respiratory retention of CO₂.
Question 2
Which laboratory value is the most sensitive indicator of fluid volume deficit in an elderly patient?
A. Serum sodium 148 mEq/L
B. Urine specific gravity 1.032
C. Hematocrit 52%
D. Serum creatinine 1.8 mg/dL
🟢 Correct answer: B
🔴 RATIONALE: Urine specific gravity is the most sensitive early indicator of fluid volume deficit, as it directly reflects kidney concentration ability.
A value >1.030 indicates significant dehydration.
Question 3
A patient receiving loop diuretics develops muscle weakness and palpitations. Which electrolyte imbalance should the nurse suspect first?
A. Hyperkalemia
B. Hypokalemia
C. Hypocalcemia
D. Hypernatremia
🟢 Correct answer: B
🔴 RATIONALE: Loop diuretics (e.g., furosemide) cause significant potassium loss, leading to hypokalemia. Muscle weakness and palpitations are
classic signs of low potassium.
,Question 4
Which IV fluid is appropriate for a patient with severe hyponatremia and seizures?
A. 0.45% NaCl (hypotonic)
B. 0.9% NaCl (isotonic)
C. 3% NaCl (hypertonic)
D. D5W (hypotonic)
🟢 Correct answer: C
🔴 RATIONALE: Severe hyponatremia with neurological symptoms (seizures) requires rapid correction with hypertonic 3% saline to prevent brain
herniation.
Question 5
A patient with heart failure has bilateral leg edema, crackles on auscultation, and weight gain of 3 kg in 2 days. Which condition is most likely?
A. Fluid volume deficit
B. Fluid volume excess
C. Third-spacing
D. Dehydration
🟢 Correct answer: B
🔴 RATIONALE: These findings (edema, crackles, rapid weight gain) are classic signs of fluid volume excess, commonly seen in heart failure due to
impaired cardiac output.
Question 6
Which electrolyte imbalance is most associated with tetany, Chvostek's sign, and Trousseau's sign?
A. Hyperkalemia
B. Hypokalemia
C. Hypocalcemia
D. Hypercalcemia
🟢 Correct answer: C
, 🔴 RATIONALE: Hypocalcemia increases neuromuscular excitability, causing tetany and positive Chvostek's (facial nerve) and Trousseau's (carpal
spasm) signs.
Question 7
A patient with kidney failure has serum potassium 6.8 mEq/L. Which intervention is the nurse's first priority?
A. Administer potassium-rich foods
B. Prepare for emergent dialysis
C. Give oral potassium supplement
D. Encourage banana consumption
🟢 Correct answer: B
🔴 RATIONALE: Severe hyperkalemia (K⁺ >6.5 mEq/L) in kidney failure requires emergent dialysis to prevent fatal cardiac arrhythmias. This is a
life-threatening emergency.
Question 8
Which assessment finding is most specific for hypomagnesemia?
A.Bradypnea
B. Hyperreflexia and tremors
C. Polyuria
D. Constipation
🟢 Correct answer: B
🔴 RATIONALE: Hypomagnesemia causes neuromuscular hyperexcitability, presenting as hyperreflexia, tremors, and seizures. It often coexists with
hypocalcemia and hypokalemia.
Question 9
A patient with burns over 40% body surface area develops hypovolemia despite IV fluids. What is the primary mechanism?
RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF
Core Domains
Fluid Volume Balance (Deficit & Excess)
Electrolyte Imbalances (Sodium, Potassium, Calcium, Magnesium, Phosphorus)
Acid-Base Balance & ABG Interpretation
IV Fluid Types & Clinical Applications
Third-Spacing & Capillary Permeability
Renal Regulation of Fluids and Electrolytes
Nursing Interventions for Fluid/Electrolyte Disturbances
Pharmacological Management (Diuretics, Electrolyte Replacement)
Clinical Assessment & Monitoring Strategies
Ethics, Legal Compliance, and Professional Standards in Fluid Management
Introduction
This exam is designed to assess comprehensive knowledge and clinical decision-making skills related to fluid and electrolyte balance in adult and
pediatric patients. It evaluates the candidate's ability to recognize signs of fluid volume deficits and excesses, identify electrolyte imbalances,
interpret arterial blood gases, select appropriate IV fluids, and implement evidence-based nursing interventions. The assessment uses multiple-
choice and scenario-based questions that emphasize real-world application, critical thinking, and prioritization in clinical settings. Success on this
exam demonstrates readiness to manage complex fluid/electrolyte cases safely and effectively while adhering to regulatory and ethical standards.
Section One: Questions 1–100
Question 1
A patient with severe vomiting presents with pH 7.50, PaCO₂ 49 mmHg, and HCO₃⁻ 38 mEq/L. Which acid-base imbalance is most likely?
,A. Respiratory acidosis
B. Respiratory alkalosis
C. Metabolic alkalosis
D. Metabolic acidosis
🟢 Correct answer: C
🔴 RATIONALE: Severe vomiting causes loss of hydrochloric acid from the stomach, leading to metabolic alkalosis. The elevated pH and high
HCO₃⁻ confirm this diagnosis, while the elevated PaCO₂ represents compensatory respiratory retention of CO₂.
Question 2
Which laboratory value is the most sensitive indicator of fluid volume deficit in an elderly patient?
A. Serum sodium 148 mEq/L
B. Urine specific gravity 1.032
C. Hematocrit 52%
D. Serum creatinine 1.8 mg/dL
🟢 Correct answer: B
🔴 RATIONALE: Urine specific gravity is the most sensitive early indicator of fluid volume deficit, as it directly reflects kidney concentration ability.
A value >1.030 indicates significant dehydration.
Question 3
A patient receiving loop diuretics develops muscle weakness and palpitations. Which electrolyte imbalance should the nurse suspect first?
A. Hyperkalemia
B. Hypokalemia
C. Hypocalcemia
D. Hypernatremia
🟢 Correct answer: B
🔴 RATIONALE: Loop diuretics (e.g., furosemide) cause significant potassium loss, leading to hypokalemia. Muscle weakness and palpitations are
classic signs of low potassium.
,Question 4
Which IV fluid is appropriate for a patient with severe hyponatremia and seizures?
A. 0.45% NaCl (hypotonic)
B. 0.9% NaCl (isotonic)
C. 3% NaCl (hypertonic)
D. D5W (hypotonic)
🟢 Correct answer: C
🔴 RATIONALE: Severe hyponatremia with neurological symptoms (seizures) requires rapid correction with hypertonic 3% saline to prevent brain
herniation.
Question 5
A patient with heart failure has bilateral leg edema, crackles on auscultation, and weight gain of 3 kg in 2 days. Which condition is most likely?
A. Fluid volume deficit
B. Fluid volume excess
C. Third-spacing
D. Dehydration
🟢 Correct answer: B
🔴 RATIONALE: These findings (edema, crackles, rapid weight gain) are classic signs of fluid volume excess, commonly seen in heart failure due to
impaired cardiac output.
Question 6
Which electrolyte imbalance is most associated with tetany, Chvostek's sign, and Trousseau's sign?
A. Hyperkalemia
B. Hypokalemia
C. Hypocalcemia
D. Hypercalcemia
🟢 Correct answer: C
, 🔴 RATIONALE: Hypocalcemia increases neuromuscular excitability, causing tetany and positive Chvostek's (facial nerve) and Trousseau's (carpal
spasm) signs.
Question 7
A patient with kidney failure has serum potassium 6.8 mEq/L. Which intervention is the nurse's first priority?
A. Administer potassium-rich foods
B. Prepare for emergent dialysis
C. Give oral potassium supplement
D. Encourage banana consumption
🟢 Correct answer: B
🔴 RATIONALE: Severe hyperkalemia (K⁺ >6.5 mEq/L) in kidney failure requires emergent dialysis to prevent fatal cardiac arrhythmias. This is a
life-threatening emergency.
Question 8
Which assessment finding is most specific for hypomagnesemia?
A.Bradypnea
B. Hyperreflexia and tremors
C. Polyuria
D. Constipation
🟢 Correct answer: B
🔴 RATIONALE: Hypomagnesemia causes neuromuscular hyperexcitability, presenting as hyperreflexia, tremors, and seizures. It often coexists with
hypocalcemia and hypokalemia.
Question 9
A patient with burns over 40% body surface area develops hypovolemia despite IV fluids. What is the primary mechanism?
