KAPLAN FLUID AND ELECTROLYTE BALANCE QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF
Core Domains
*- Fluid Volume Deficit and Excess*
*- Sodium Imbalances (Hyponatremia & Hypernatremia)*
- Potassium Imbalances (Hypokalemia & Hyperkalemia)
- Calcium and Phosphate Imbalances
*- Magnesium Imbalances*
*- Acid-Base Balance and Disorders*
*- IV Fluid Therapy and Administration*
*- Nursing Interventions and Monitoring*
*- Regulatory and Legal Compliance in Fluid Management*
*- Ethical Considerations in Fluid/Electrolyte Care*
Introduction
This comprehensive assessment evaluates nursing competence in fluid and electrolyte balance, a critical foundation for safe patient care across all
clinical settings. The exam measures knowledge of homeostasis mechanisms, recognition of imbalances, appropriate interventions, and clinical
decision-making skills. Questions are presented in multiple-choice format with clinical scenarios that mirror real-world practice situations.
Candidates must demonstrate understanding of pathophysiology, laboratory interpretation, medication administration, monitoring techniques,
and prioritization strategies. Emphasis is placed on applying theoretical knowledge to clinical decision-making, recognizing critical values,
preventing complications, and ensuring patient safety through evidence-based interventions. This exam prepares nursing professionals for
certification assessments and clinical practice requirements.
SECTION ONE: QUESTIONS 1–100
Question 1
A patient presents with vomiting and diarrhea for 3 days. Vital signs show BP 90/60 mmHg, HR 118 bpm, and dry mucous membranes. Which
assessment finding best supports fluid volume deficit?
A. Bounding pulse
B. Jugular vein distention
C. High urine specific gravity
D. Decreased BUN
,🟢 C. High urine specific gravity
🔴 RATIONALE: In fluid volume deficit (hypovolemia), the kidneys conserve water resulting in concentrated urine with high specific gravity
(>1.030). Bounding pulse and jugular vein distention indicate fluid volume excess. Decreased BUN occurs in hypervolemia due to dilution, while
hypovolemia causes increased BUN.
Question 2
Which IV fluid is most appropriate for immediate volume replacement in a patient with hypovolemic shock?
A. 0.45% NaCl
B. D5W
C. 0.9% NaCl
D. 3% NaCl
🟢 C. 0.9% NaCl
🔴 RATIONALE: Isotonic fluids like 0.9% NaCl (normal saline) and Lactated Ringer's are used for rapid intravascular volume replacement in
hypovolemia. Hypotonic fluids (0.45% NaCl, D5W) shift fluid into cells and are inappropriate for shock. Hypertonic 3% NaCl is used for severe
hyponatremia, not volume replacement.
Question 3
A patient with heart failure has crackles in both lung fields, weight gain of 3 kg in 2 days, and bounding pulse. Which lab finding is expected?
A. Increased hematocrit
B. Decreased BUN
C. Increased serum sodium
D. High urine specific gravity
🟢 B. Decreased BUN
🔴 RATIONALE: In fluid volume excess (hypervolemia), excess fluid dilutes blood components causing decreased BUN and hematocrit. Increased
hematocrit, increased sodium, and high urine specific gravity are findings in hypovolemia where hemoconcentration occurs.
,Question 4
Normal serum sodium level range is:
A. 125–135 mEq/L
B. 135–145 mEq/L
C. 130–140 mEq/L
D. 145–155 mEq/L
🟢 B. 135–145 mEq/L
🔴 RATIONALE: Normal serum sodium is 135–145 mEq/L. Hyponatremia is sodium <135 mEq/L, and hypernatremia is sodium >145 mEq/L. This
is a fundamental value all nursing professionals must memorize.
Question 5
Which condition causes dilutional hyponatremia through water retention?
A. Diabetes insipidus
B. SIADH
C. Dehydration
D. Diabetic ketoacidosis
🟢 B. SIADH
🔴 RATIONALE: Syndrome of Inappropriate Antidiuretic Hormone (SIADH) causes excessive water retention which dilutes serum sodium, leading
to dilutional hyponatremia. Diabetes insipidus causes water loss and hypernatremia. Dehydration causes hypernatremia, and DKA causes
hypernatremia or pseudohyponatremia.
Question 6
A patient with hyponatremia presents with lethargy and confusion. What is the primary pathophysiological mechanism?
, A. Cellular dehydration
B. Cerebral edema from water shift into brain cells
C. Hypovolemic shock
D. Hyperosmolar state
🟢 B. Cerebral edema from water shift into brain cells
🔴 RATIONALE: Low serum sodium creates hypotonicity causing water to shift into brain cells, resulting in cerebral edema. This causes
neurological symptoms like lethargy, confusion, seizures, and coma. Cellular dehydration occurs in hypernatremia, not hyponatremia.
Question 7
Which IV solution is indicated for severe symptomatic hyponatremia?
A. 0.9% NaCl
B. 3% NaCl
C. Lactated Ringer's
D. D5W
🟢 B. 3% NaCl
🔴 RATIONALE: Hypertonic saline (3% NaCl) is used for severe symptomatic hyponatremia to rapidly but carefully increase serum sodium. Isotonic
0.9% NaCl and LR are for volume replacement. D5W is hypotonic and would worsen hyponatremia.
Question 8
Hypernatremia is defined as serum sodium greater than:
A. 135 mEq/L
B. 140 mEq/L
C. 145 mEq/L
D. 150 mEq/L
🟢 C. 145 mEq/L
RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF
Core Domains
*- Fluid Volume Deficit and Excess*
*- Sodium Imbalances (Hyponatremia & Hypernatremia)*
- Potassium Imbalances (Hypokalemia & Hyperkalemia)
- Calcium and Phosphate Imbalances
*- Magnesium Imbalances*
*- Acid-Base Balance and Disorders*
*- IV Fluid Therapy and Administration*
*- Nursing Interventions and Monitoring*
*- Regulatory and Legal Compliance in Fluid Management*
*- Ethical Considerations in Fluid/Electrolyte Care*
Introduction
This comprehensive assessment evaluates nursing competence in fluid and electrolyte balance, a critical foundation for safe patient care across all
clinical settings. The exam measures knowledge of homeostasis mechanisms, recognition of imbalances, appropriate interventions, and clinical
decision-making skills. Questions are presented in multiple-choice format with clinical scenarios that mirror real-world practice situations.
Candidates must demonstrate understanding of pathophysiology, laboratory interpretation, medication administration, monitoring techniques,
and prioritization strategies. Emphasis is placed on applying theoretical knowledge to clinical decision-making, recognizing critical values,
preventing complications, and ensuring patient safety through evidence-based interventions. This exam prepares nursing professionals for
certification assessments and clinical practice requirements.
SECTION ONE: QUESTIONS 1–100
Question 1
A patient presents with vomiting and diarrhea for 3 days. Vital signs show BP 90/60 mmHg, HR 118 bpm, and dry mucous membranes. Which
assessment finding best supports fluid volume deficit?
A. Bounding pulse
B. Jugular vein distention
C. High urine specific gravity
D. Decreased BUN
,🟢 C. High urine specific gravity
🔴 RATIONALE: In fluid volume deficit (hypovolemia), the kidneys conserve water resulting in concentrated urine with high specific gravity
(>1.030). Bounding pulse and jugular vein distention indicate fluid volume excess. Decreased BUN occurs in hypervolemia due to dilution, while
hypovolemia causes increased BUN.
Question 2
Which IV fluid is most appropriate for immediate volume replacement in a patient with hypovolemic shock?
A. 0.45% NaCl
B. D5W
C. 0.9% NaCl
D. 3% NaCl
🟢 C. 0.9% NaCl
🔴 RATIONALE: Isotonic fluids like 0.9% NaCl (normal saline) and Lactated Ringer's are used for rapid intravascular volume replacement in
hypovolemia. Hypotonic fluids (0.45% NaCl, D5W) shift fluid into cells and are inappropriate for shock. Hypertonic 3% NaCl is used for severe
hyponatremia, not volume replacement.
Question 3
A patient with heart failure has crackles in both lung fields, weight gain of 3 kg in 2 days, and bounding pulse. Which lab finding is expected?
A. Increased hematocrit
B. Decreased BUN
C. Increased serum sodium
D. High urine specific gravity
🟢 B. Decreased BUN
🔴 RATIONALE: In fluid volume excess (hypervolemia), excess fluid dilutes blood components causing decreased BUN and hematocrit. Increased
hematocrit, increased sodium, and high urine specific gravity are findings in hypovolemia where hemoconcentration occurs.
,Question 4
Normal serum sodium level range is:
A. 125–135 mEq/L
B. 135–145 mEq/L
C. 130–140 mEq/L
D. 145–155 mEq/L
🟢 B. 135–145 mEq/L
🔴 RATIONALE: Normal serum sodium is 135–145 mEq/L. Hyponatremia is sodium <135 mEq/L, and hypernatremia is sodium >145 mEq/L. This
is a fundamental value all nursing professionals must memorize.
Question 5
Which condition causes dilutional hyponatremia through water retention?
A. Diabetes insipidus
B. SIADH
C. Dehydration
D. Diabetic ketoacidosis
🟢 B. SIADH
🔴 RATIONALE: Syndrome of Inappropriate Antidiuretic Hormone (SIADH) causes excessive water retention which dilutes serum sodium, leading
to dilutional hyponatremia. Diabetes insipidus causes water loss and hypernatremia. Dehydration causes hypernatremia, and DKA causes
hypernatremia or pseudohyponatremia.
Question 6
A patient with hyponatremia presents with lethargy and confusion. What is the primary pathophysiological mechanism?
, A. Cellular dehydration
B. Cerebral edema from water shift into brain cells
C. Hypovolemic shock
D. Hyperosmolar state
🟢 B. Cerebral edema from water shift into brain cells
🔴 RATIONALE: Low serum sodium creates hypotonicity causing water to shift into brain cells, resulting in cerebral edema. This causes
neurological symptoms like lethargy, confusion, seizures, and coma. Cellular dehydration occurs in hypernatremia, not hyponatremia.
Question 7
Which IV solution is indicated for severe symptomatic hyponatremia?
A. 0.9% NaCl
B. 3% NaCl
C. Lactated Ringer's
D. D5W
🟢 B. 3% NaCl
🔴 RATIONALE: Hypertonic saline (3% NaCl) is used for severe symptomatic hyponatremia to rapidly but carefully increase serum sodium. Isotonic
0.9% NaCl and LR are for volume replacement. D5W is hypotonic and would worsen hyponatremia.
Question 8
Hypernatremia is defined as serum sodium greater than:
A. 135 mEq/L
B. 140 mEq/L
C. 145 mEq/L
D. 150 mEq/L
🟢 C. 145 mEq/L
