DaVita Final Exam Questions and Answers
with Rationale 2026/2027
Question 1
What is the primary purpose of the water treatment system in a
hemodialysis facility?
A) To add essential minerals and trace nutrients back into
municipal tap water
B) To remove chemical contaminants, heavy metals, chlorine,
chloramines, bacteria, and endotoxins from feed water before it
reaches the proportioning system
C) To cool the municipal water supply to freezing temperatures
D) To increase the electrical conductivity of the dialysate
concentrate
Answer: B
Rationale: Because dialysis patients are exposed to massive
volumes of water across semipermeable membranes, the water
treatment system must purify feed water to eliminate toxic
contaminants, chemicals, and biological pathogens.
Question 2
What immediate action must a Patient Care Technician take if
total chlorine testing of the primary carbon adsorption tank
,effluent reveals a level above the allowable limit (greater than
0.1 mg/L)?
A) Ignore the reading if the municipal water pressure is stable
B) Stop all dialysis treatments immediately, notify the licensed
nurse and biomedical technician, and prevent water from
entering the reverse osmosis system
C) Increase the dialysate temperature by two degrees Celsius
D) Flush the water softener tank with concentrated acid solution
Answer: B
Rationale: Chlorine and chloramines are potent oxidizers that
destroy red blood cell membranes on contact; breakthrough
above safe limits requires immediate shutdown to protect
patients from acute hemolysis.
Question 3
What is the correct protocol for collecting a post-dialysis blood
urea nitrogen (BUN) sample to ensure an accurate Kt/V
calculation?
A) Draw the sample immediately while the blood pump is
running at 400 mL/min
B) Reduce the blood pump speed to 100 mL/min for 15 seconds,
stop the pump, clamp the arterial line, and draw the sample from
the arterial port to avoid recirculation contamination
,C) Collect the sample from the venous line 10 minutes before
the end of treatment without altering pump speed
D) Draw the sample directly from the patient's arm using a
standard peripheral venipuncture needle
Answer: B
Rationale: Waiting 15 seconds at a reduced blood pump speed of
100 mL/min eliminates access cardiopulmonary recirculation,
ensuring the post-BUN sample accurately reflects systemic urea
concentration.
Question 4
During hemodialysis, what condition is most frequently
responsible for a sudden, sharp rise in dynamic venous pressure?
A) An empty saline bag attached to the arterial blood line
B) A physical obstruction or restriction downstream from the
pressure monitor, such as a kinked venous blood line or a clotted
drip chamber
C) A complete failure of the municipal water supply pressure
D) Low dialysate flow rate through the dialyzer compartment
Answer: B
Rationale: Any blockage, kinking, or clotting located between
the pressure monitor and the patient's vascular access creates
backpressure, registering as an elevated venous pressure alarm.
Question 5
, What is the primary clinical consequence of chronic
hyperphosphatemia in end-stage renal disease patients?
A) Rapid reduction in blood pressure and increased energy
levels
B) Accelerated bone mineral loss, vascular calcification, and
secondary hyperparathyroidism
C) Complete normalization of serum albumin and protein values
D) Immediate improvement in red blood cell production
Answer: B
Rationale: Uncontrolled high serum phosphorus binds with
calcium, leading to severe bone demineralization, metastatic
calcification of blood vessels, and parathyroid hyperplasia.
Question 6
What is the primary physiological mechanism by which
hemodialysis removes excess fluid from a patient?
A) Active chemical transport across the dialyzer membrane
B) Ultrafiltration driven by a positive or negative
transmembrane pressure gradient
C) Osmosis using heavy protein molecules in the dialysate
D) Natural evaporation through the patient's skin pores
Answer: B
with Rationale 2026/2027
Question 1
What is the primary purpose of the water treatment system in a
hemodialysis facility?
A) To add essential minerals and trace nutrients back into
municipal tap water
B) To remove chemical contaminants, heavy metals, chlorine,
chloramines, bacteria, and endotoxins from feed water before it
reaches the proportioning system
C) To cool the municipal water supply to freezing temperatures
D) To increase the electrical conductivity of the dialysate
concentrate
Answer: B
Rationale: Because dialysis patients are exposed to massive
volumes of water across semipermeable membranes, the water
treatment system must purify feed water to eliminate toxic
contaminants, chemicals, and biological pathogens.
Question 2
What immediate action must a Patient Care Technician take if
total chlorine testing of the primary carbon adsorption tank
,effluent reveals a level above the allowable limit (greater than
0.1 mg/L)?
A) Ignore the reading if the municipal water pressure is stable
B) Stop all dialysis treatments immediately, notify the licensed
nurse and biomedical technician, and prevent water from
entering the reverse osmosis system
C) Increase the dialysate temperature by two degrees Celsius
D) Flush the water softener tank with concentrated acid solution
Answer: B
Rationale: Chlorine and chloramines are potent oxidizers that
destroy red blood cell membranes on contact; breakthrough
above safe limits requires immediate shutdown to protect
patients from acute hemolysis.
Question 3
What is the correct protocol for collecting a post-dialysis blood
urea nitrogen (BUN) sample to ensure an accurate Kt/V
calculation?
A) Draw the sample immediately while the blood pump is
running at 400 mL/min
B) Reduce the blood pump speed to 100 mL/min for 15 seconds,
stop the pump, clamp the arterial line, and draw the sample from
the arterial port to avoid recirculation contamination
,C) Collect the sample from the venous line 10 minutes before
the end of treatment without altering pump speed
D) Draw the sample directly from the patient's arm using a
standard peripheral venipuncture needle
Answer: B
Rationale: Waiting 15 seconds at a reduced blood pump speed of
100 mL/min eliminates access cardiopulmonary recirculation,
ensuring the post-BUN sample accurately reflects systemic urea
concentration.
Question 4
During hemodialysis, what condition is most frequently
responsible for a sudden, sharp rise in dynamic venous pressure?
A) An empty saline bag attached to the arterial blood line
B) A physical obstruction or restriction downstream from the
pressure monitor, such as a kinked venous blood line or a clotted
drip chamber
C) A complete failure of the municipal water supply pressure
D) Low dialysate flow rate through the dialyzer compartment
Answer: B
Rationale: Any blockage, kinking, or clotting located between
the pressure monitor and the patient's vascular access creates
backpressure, registering as an elevated venous pressure alarm.
Question 5
, What is the primary clinical consequence of chronic
hyperphosphatemia in end-stage renal disease patients?
A) Rapid reduction in blood pressure and increased energy
levels
B) Accelerated bone mineral loss, vascular calcification, and
secondary hyperparathyroidism
C) Complete normalization of serum albumin and protein values
D) Immediate improvement in red blood cell production
Answer: B
Rationale: Uncontrolled high serum phosphorus binds with
calcium, leading to severe bone demineralization, metastatic
calcification of blood vessels, and parathyroid hyperplasia.
Question 6
What is the primary physiological mechanism by which
hemodialysis removes excess fluid from a patient?
A) Active chemical transport across the dialyzer membrane
B) Ultrafiltration driven by a positive or negative
transmembrane pressure gradient
C) Osmosis using heavy protein molecules in the dialysate
D) Natural evaporation through the patient's skin pores
Answer: B
