Page 1 of 42
NURS 3209 FLUID AND ELECTROLYTE BALANCE
PRACTICE EXAM 2026/2027 COMPLETE (100) CURRENT
TESTING QUESTIONS AND CORRECT ANSWERS WITH
DETAILED RATIONALES.
NURS
Prepare for the NURS 3209 Fluid and Electrolyte Balance Exam Practice with a focused
study resource designed to reinforce essential nursing concepts related to fluid
regulation and electrolyte balance. It supports review of fluid volume changes,
electrolyte imbalances, intake and output, hydration, laboratory values, and
appropriate nursing interventions. Use the practice material to strengthen clinical
judgment, recognize abnormal findings, and identify areas that may require additional
review before the exam. This resource is best suited for NURS 3209 nursing students
and healthcare learners preparing for fluid and electrolyte balance assessments.
MULTIPLE CHOICE.
SECTION 1: BODY FLUID COMPARTMENTS AND DISTRIBUTION (Questions
1–15)
Question 1:
Which body fluid compartment contains the largest percentage of total body
water?
A) Intravascular fluid
B) Interstitial fluid
C) Intracellular fluid
D) Transcellular fluid
Answer: C) Intracellular fluid
Rationale: Intracellular fluid is the largest fluid compartment and
contains approximately two-thirds of total body water. Extracellular fluid
(which includes intravascular, interstitial, and transcellular fluid)
accounts for the remaining one-third.
, Page 2 of 42
Question 2:
Which statement correctly describes the distribution of body fluids in a
healthy adult? (Select all that apply)
A) Intracellular fluid (ICF) accounts for approximately one-third of total body
water
B) Extracellular fluid (ECF) is subdivided into interstitial fluid and plasma
C) The majority of body water is located in the extracellular compartment
D) Transcellular fluid includes cerebrospinal fluid, synovial fluid, and
peritoneal fluid
Answer: B and D
Rationale: In a healthy adult, total body water (TBW) is distributed as
follows: Intracellular fluid (ICF) accounts for approximately two-thirds
(about 65–75%) of TBW. Extracellular fluid (ECF) accounts for
approximately one-third of TBW and is subdivided into: interstitial fluid
(fluid between cells, about 75% of ECF), plasma (fluid within blood
vessels, about 25% of ECF), and transcellular fluid (cerebrospinal fluid,
synovial fluid, peritoneal fluid, pleural fluid, intraocular fluid, digestive
secretions). Both statements B and D are correct.
Question 3:
What is the average normal amount for fluid intake and fluid output in a
healthy adult?
A) 1,500 mL/day
B) 2,000 mL/day
C) 2,600 mL/day
D) 3,500 mL/day
Answer: C) 2,600 mL/day
Rationale: The average normal amount for fluid intake and fluid output is
approximately 2,600 mL/day. This balance is maintained through the
regulation of thirst, antidiuretic hormone (ADH), aldosterone, and the
renin-angiotensin-aldosterone system.
, Page 3 of 42
Question 4:
Insensible fluid loss refers to water loss through:
A) Urine output
B) Diarrhea and vomiting
C) Sweating and respiration
D) Wound drainage
Answer: C) Sweating and respiration
Rationale: Insensible fluid loss is the continuous, unnoticed loss of water
through the skin (perspiration) and lungs (respiration). It is not easily
measured and typically amounts to 500–1,000 mL/day. Sensible losses
include urine, feces, and wound drainage.
Question 5:
A patient with heart failure is at risk for which fluid imbalance?
A) Hypovolemia
B) Hypervolemia
C) Dehydration
D) Hypokalemia
Answer: B) Hypervolemia
Rationale: Hypervolemia (fluid volume excess) can be caused by heart
failure, renal failure, liver cirrhosis, excess IV fluid intake, and excess
sodium ingestion. In heart failure, the heart's decreased pumping ability
leads to fluid retention and edema.
Question 6:
What is the expected minimum urine output per hour in an adult?
A) 15 mL/hour
B) 30 mL/hour
C) 60 mL/hour
D) 100 mL/hour
Answer: B) 30 mL/hour
, Page 4 of 42
Rationale: The expected minimum urine output per hour in an adult is 30
mL/hour (or 0.5 mL/kg/hour). Output below this level may indicate
hypovolemia or renal impairment.
Question 7:
The nurse is assessing a patient with a significant intake/output imbalance.
What is the most appropriate action?
A) Document the imbalance and continue monitoring
B) Call the healthcare provider
C) Increase the patient's oral fluid intake
D) Administer a diuretic
Answer: B) Call the healthcare provider
Rationale: When a significant I/O imbalance is noted, the nurse should
call the healthcare provider to report the findings and obtain orders for
appropriate interventions. This is a safety priority.
Question 8:
A 2.2 lb (1 kg) weight gain is equivalent to approximately how many mL of fluid
retention?
A) 500 mL
B) 750 mL
C) 1,000 mL (1 L)
D) 1,500 mL
Answer: C) 1,000 mL (1 L)
Rationale: A 2.2 lb (1 kg) weight gain is equivalent to approximately 1,000
mL (1 L) of fluid retention. Daily weights are the most accurate indicator of
fluid volume status.
Question 9:
Which assessment finding is the most accurate way for the nurse to evaluate
NURS 3209 FLUID AND ELECTROLYTE BALANCE
PRACTICE EXAM 2026/2027 COMPLETE (100) CURRENT
TESTING QUESTIONS AND CORRECT ANSWERS WITH
DETAILED RATIONALES.
NURS
Prepare for the NURS 3209 Fluid and Electrolyte Balance Exam Practice with a focused
study resource designed to reinforce essential nursing concepts related to fluid
regulation and electrolyte balance. It supports review of fluid volume changes,
electrolyte imbalances, intake and output, hydration, laboratory values, and
appropriate nursing interventions. Use the practice material to strengthen clinical
judgment, recognize abnormal findings, and identify areas that may require additional
review before the exam. This resource is best suited for NURS 3209 nursing students
and healthcare learners preparing for fluid and electrolyte balance assessments.
MULTIPLE CHOICE.
SECTION 1: BODY FLUID COMPARTMENTS AND DISTRIBUTION (Questions
1–15)
Question 1:
Which body fluid compartment contains the largest percentage of total body
water?
A) Intravascular fluid
B) Interstitial fluid
C) Intracellular fluid
D) Transcellular fluid
Answer: C) Intracellular fluid
Rationale: Intracellular fluid is the largest fluid compartment and
contains approximately two-thirds of total body water. Extracellular fluid
(which includes intravascular, interstitial, and transcellular fluid)
accounts for the remaining one-third.
, Page 2 of 42
Question 2:
Which statement correctly describes the distribution of body fluids in a
healthy adult? (Select all that apply)
A) Intracellular fluid (ICF) accounts for approximately one-third of total body
water
B) Extracellular fluid (ECF) is subdivided into interstitial fluid and plasma
C) The majority of body water is located in the extracellular compartment
D) Transcellular fluid includes cerebrospinal fluid, synovial fluid, and
peritoneal fluid
Answer: B and D
Rationale: In a healthy adult, total body water (TBW) is distributed as
follows: Intracellular fluid (ICF) accounts for approximately two-thirds
(about 65–75%) of TBW. Extracellular fluid (ECF) accounts for
approximately one-third of TBW and is subdivided into: interstitial fluid
(fluid between cells, about 75% of ECF), plasma (fluid within blood
vessels, about 25% of ECF), and transcellular fluid (cerebrospinal fluid,
synovial fluid, peritoneal fluid, pleural fluid, intraocular fluid, digestive
secretions). Both statements B and D are correct.
Question 3:
What is the average normal amount for fluid intake and fluid output in a
healthy adult?
A) 1,500 mL/day
B) 2,000 mL/day
C) 2,600 mL/day
D) 3,500 mL/day
Answer: C) 2,600 mL/day
Rationale: The average normal amount for fluid intake and fluid output is
approximately 2,600 mL/day. This balance is maintained through the
regulation of thirst, antidiuretic hormone (ADH), aldosterone, and the
renin-angiotensin-aldosterone system.
, Page 3 of 42
Question 4:
Insensible fluid loss refers to water loss through:
A) Urine output
B) Diarrhea and vomiting
C) Sweating and respiration
D) Wound drainage
Answer: C) Sweating and respiration
Rationale: Insensible fluid loss is the continuous, unnoticed loss of water
through the skin (perspiration) and lungs (respiration). It is not easily
measured and typically amounts to 500–1,000 mL/day. Sensible losses
include urine, feces, and wound drainage.
Question 5:
A patient with heart failure is at risk for which fluid imbalance?
A) Hypovolemia
B) Hypervolemia
C) Dehydration
D) Hypokalemia
Answer: B) Hypervolemia
Rationale: Hypervolemia (fluid volume excess) can be caused by heart
failure, renal failure, liver cirrhosis, excess IV fluid intake, and excess
sodium ingestion. In heart failure, the heart's decreased pumping ability
leads to fluid retention and edema.
Question 6:
What is the expected minimum urine output per hour in an adult?
A) 15 mL/hour
B) 30 mL/hour
C) 60 mL/hour
D) 100 mL/hour
Answer: B) 30 mL/hour
, Page 4 of 42
Rationale: The expected minimum urine output per hour in an adult is 30
mL/hour (or 0.5 mL/kg/hour). Output below this level may indicate
hypovolemia or renal impairment.
Question 7:
The nurse is assessing a patient with a significant intake/output imbalance.
What is the most appropriate action?
A) Document the imbalance and continue monitoring
B) Call the healthcare provider
C) Increase the patient's oral fluid intake
D) Administer a diuretic
Answer: B) Call the healthcare provider
Rationale: When a significant I/O imbalance is noted, the nurse should
call the healthcare provider to report the findings and obtain orders for
appropriate interventions. This is a safety priority.
Question 8:
A 2.2 lb (1 kg) weight gain is equivalent to approximately how many mL of fluid
retention?
A) 500 mL
B) 750 mL
C) 1,000 mL (1 L)
D) 1,500 mL
Answer: C) 1,000 mL (1 L)
Rationale: A 2.2 lb (1 kg) weight gain is equivalent to approximately 1,000
mL (1 L) of fluid retention. Daily weights are the most accurate indicator of
fluid volume status.
Question 9:
Which assessment finding is the most accurate way for the nurse to evaluate
