DaVita PCT Basic Training Final Exam (2026/2027) Verified Answers
DaVita PCT Basic Training Final Exam
Questions and Answers ()
Verified Answers | CMS & DaVita Clinical Standards Aligned
Section 1: Kidney Anatomy and Physiology
Questions 1-15
Q1: The kidneys receive approximately what percentage of the cardiac output at rest?
A. 5-10%
B. 15-20%
C. 20-25% [CORRECT]
D. 35-40%
Correct Answer: C
Rationale: The kidneys receive approximately 20-25% of cardiac output at rest, which equates to roughly 1,000 to 1,200 mL of
blood per minute through the renal arteries. This high blood flow is essential for the kidneys' primary functions of filtration,
reabsorption, and secretion. This substantial perfusion allows the glomeruli to filter approximately 180 liters of plasma per
day. The remaining options underestimate or overestimate the actual renal blood flow percentage. Options A and B are too low,
while option D is excessively high for resting conditions.
Q2: Which structure is responsible for forming the filtrate during the initial step of urine
formation?
A. Loop of Henle
B. Bowman's capsule and glomerulus [CORRECT]
C. Collecting duct
D. Distal convoluted tubule
Correct Answer: B
Rationale: The glomerulus, enclosed within Bowman's capsule, forms the renal corpuscle and is the site of initial blood
filtration. Hydrostatic pressure within the glomerular capillaries forces water and small solutes across the filtration membrane
into Bowman's capsule, creating the filtrate. The Loop of Henle is responsible for concentrating urine through countercurrent
multiplication. The collecting duct adjusts final urine concentration under the influence of antidiuretic hormone (ADH). The
distal convoluted tubule is involved in fine-tuning electrolyte and acid-base balance.
Q3: A PCT is reviewing a patient's lab results and notes a BUN of 45 mg/dL and a serum
creatinine of 3.2 mg/dL. These values most likely indicate:
A. Adequate kidney function with normal GFR
B. Acute kidney injury or worsening chronic kidney disease with reduced GFR
[CORRECT]
C. Dehydration without renal impairment
D. Protein malnutrition with normal renal clearance
Correct Answer: B
Rationale: Elevated BUN (normal 7-20 mg/dL) and serum creatinine (normal 0.7-1.3 mg/dL for adults) both indicate reduced
glomerular filtration rate (GFR), which is the primary marker of kidney function. A BUN of 45 mg/dL and creatinine of 3.2
mg/dL represent significantly impaired kidney function consistent with acute kidney injury (AKI) or advanced chronic kidney
disease (CKD). While dehydration can elevate BUN, the concomitant rise in creatinine confirms renal impairment. Protein
malnutrition would typically cause a low BUN, not an elevated one. These values require immediate clinical attention and
physician notification per facility protocol.
CMS Conditions for Coverage Aligned | DaVita Clinical Standards
1
,DaVita PCT Basic Training Final Exam (2026/2027) Verified Answers
Q4: Which hormone produced by the kidneys is primarily responsible for stimulating red
blood cell production?
A. Aldosterone
B. Antidiuretic hormone (ADH)
C. Erythropoietin (EPO) [CORRECT]
D. Renin
Correct Answer: C
Rationale: Erythropoietin (EPO) is a glycoprotein hormone produced and released by the kidneys in response to hypoxia. EPO
stimulates the bone marrow to increase red blood cell (RBC) production. In chronic kidney disease, decreased EPO production
leads to anemia of chronic disease, which is why many ESRD patients require EPO-stimulating agents (ESAs) during dialysis.
Aldosterone is produced by the adrenal cortex and regulates sodium and potassium balance. ADH is produced by the posterior
pituitary and regulates water reabsorption. Renin is released by the kidneys but acts on the renin-angiotensin-aldosterone
system to regulate blood pressure, not RBC production.
Q5: The nephron's ability to concentrate urine depends primarily on which mechanism?
A. Active transport in the proximal convoluted tubule
B. Countercurrent multiplication in the Loop of Henle [CORRECT]
C. Osmotic diffusion in the collecting duct
D. Filtration pressure in the glomerulus
Correct Answer: B
Rationale: Countercurrent multiplication in the Loop of Henle is the primary mechanism that creates the medullary osmotic
gradient necessary for urine concentration. The descending limb is permeable to water but not solutes, while the ascending
limb actively transports sodium, chloride, and potassium out, creating a gradient that can reach 1,200 mOsm/L at the tip of the
medulla. This gradient allows the collecting duct, under the influence of ADH, to reabsorb water and produce concentrated
urine. While active transport in the PCT is important for bulk reabsorption, and ADH-mediated water reabsorption in the
collecting duct is the final step, neither creates the concentration gradient itself.
[Select All That Apply]
Q6: Which of the following are normal functions of healthy kidneys? (Select All That
Apply)
A. Regulation of fluid and electrolyte balance [CORRECT]
B. Removal of metabolic waste products [CORRECT]
C. Regulation of acid-base balance [CORRECT]
D. Production of vitamin D active form (calcitriol) [CORRECT]
E. Storage of glycogen for energy reserves
Correct Answer: A, B, C, D
Rationale: Healthy kidneys perform multiple essential functions: (1) regulation of fluid and electrolyte balance by selectively
reabsorbing and secreting ions such as sodium, potassium, calcium, and phosphate; (2) removal of metabolic waste products
including urea, creatinine, and uric acid; (3) regulation of acid-base balance through bicarbonate reabsorption and hydrogen
ion secretion; and (4) production of the active form of vitamin D (1,25-dihydroxyvitamin D3, or calcitriol), which is essential
for calcium absorption and bone metabolism. Glycogen storage is a function of the liver and skeletal muscle, not the kidneys.
Understanding these functions is critical for PCTs because dialysis partially replaces only the waste removal and fluid balance
functions.
CMS Conditions for Coverage Aligned | DaVita Clinical Standards
2
,DaVita PCT Basic Training Final Exam (2026/2027) Verified Answers
Q7: A patient with ESRD presents with a serum potassium level of 6.8 mEq/L. The PCT
should recognize this as:
A. A normal finding in dialysis patients
B. Mild hyperkalemia requiring dietary counseling only
C. A medical emergency requiring immediate intervention [CORRECT]
D. A laboratory error that should be rechecked in one week
Correct Answer: C
Rationale: A serum potassium of 6.8 mEq/L is a critical hyperkalemic value (normal range 3.5-5.0 mEq/L) and constitutes a
medical emergency. Hyperkalemia can cause life-threatening cardiac arrhythmias, including ventricular fibrillation and
asystole. The PCT must immediately notify the nurse or physician, ensure the patient is on a cardiac monitor, and prepare for
emergency dialysis or administration of medications such as calcium gluconate, insulin with dextrose, or kayexalate. This is not
a normal finding even in ESRD patients, and delaying intervention can result in cardiac arrest. CMS Conditions for Coverage
require facilities to have protocols for managing hyperkalemia.
Q8: What is the primary route by which the kidneys regulate blood pressure?
A. Increasing heart rate through vagal stimulation
B. The renin-angiotensin-aldosterone system (RAAS) [CORRECT]
C. Direct neural innervation of the aortic arch
D. Secretion of thyroid-stimulating hormone
Correct Answer: B
Rationale: The kidneys regulate blood pressure primarily through the renin-angiotensin-aldosterone system (RAAS). When
renal perfusion pressure drops, juxtaglomerular cells in the afferent arteriole release renin. Renin converts angiotensinogen to
angiotensin I, which is then converted by angiotensin-converting enzyme (ACE) in the lungs to angiotensin II. Angiotensin II
causes vasoconstriction and stimulates aldosterone release from the adrenal cortex, leading to sodium and water retention,
both of which increase blood pressure. ESRD patients frequently have hypertension due to fluid overload and dysregulated
RAAS, making blood pressure management a key component of dialysis treatment.
Q9: The normal glomerular filtration rate (GFR) for a healthy adult is approximately:
A. 25-50 mL/min
B. 60-90 mL/min
C. 90-120 mL/min [CORRECT]
D. 150-200 mL/min
Correct Answer: C
Rationale: A normal GFR for a healthy adult is approximately 90-120 mL/min/1.73 m2. GFR is the best overall indicator of
kidney function and is used to stage chronic kidney disease. CKD Stage 1 is GFR greater than or equal to 90 with kidney
damage; Stage 2 is 60-89; Stage 3a is 45-59; Stage 3b is 30-44; Stage 4 is 15-29; and Stage 5 (ESRD) is less than 15 mL/min,
at which point renal replacement therapy (dialysis or transplant) is typically required. Most dialysis patients have a GFR below
15 mL/min. PCTs should understand GFR staging because it determines the treatment plan and frequency of dialysis sessions.
CMS Conditions for Coverage Aligned | DaVita Clinical Standards
3
, DaVita PCT Basic Training Final Exam (2026/2027) Verified Answers
Q10: Which segment of the nephron is the primary site of drug and toxin secretion?
A. Glomerulus
B. Proximal convoluted tubule [CORRECT]
C. Ascending Loop of Henle
D. Collecting duct
Correct Answer: B
Rationale: The proximal convoluted tubule (PCT) is the primary site for the active secretion of drugs, toxins, and organic
acids/bases from the peritubular capillaries into the tubular lumen. This is a critical concept for dialysis patient care because
many medications given to ESRD patients require dose adjustments due to impaired secretion and reduced clearance. The PCT
contains specific transport proteins (OAT and OCT families) that actively pump substances into the tubular fluid for excretion.
The glomerulus is the site of passive filtration. The ascending Loop of Henle actively reabsorbs sodium and potassium. The
collecting duct primarily handles water reabsorption under ADH control.
Q11: A dialysis patient's lab shows a phosphorus level of 7.2 mg/dL. What complication is
this patient most at risk for developing?
A. Hypocalcemia and renal osteodystrophy [CORRECT]
B. Hypernatremia and fluid overload
C. Metabolic alkalosis
D. Increased red blood cell production
Correct Answer: A
Rationale: Elevated phosphorus (normal 2.5-4.5 mg/dL) in ESRD patients leads to hypocalcemia because excess phosphorus
binds with serum calcium, lowering ionized calcium levels. This triggers secondary hyperparathyroidism as the parathyroid
glands attempt to raise calcium by releasing PTH, which in turn causes calcium to be leached from bones, leading to renal
osteodystrophy. Management includes phosphorus binders (taken with meals), dietary phosphorus restriction, and possibly
calcimimetics. This is a critical concept for PCTs because they often educate patients about phosphorus-rich foods to avoid and
reinforce medication adherence for phosphate binders.
Q12: The peritubular capillaries surrounding the nephron are primarily involved in:
A. Forming the glomerular filtrate
B. Reabsorbing substances from the tubular fluid back into the blood [CORRECT]
C. Actively secreting hormones into the filtrate
D. Filtering proteins and blood cells from the plasma
Correct Answer: B
Rationale: The peritubular capillaries are the vascular network that surrounds the renal tubules and is primarily responsible
for reabsorbing water, electrolytes, glucose, amino acids, and other essential substances from the tubular lumen back into the
bloodstream. After filtration occurs at the glomerulus, approximately 99% of the filtrate is reabsorbed through the peritubular
capillaries via both active and passive transport mechanisms. The vasa recta, which are specialized peritubular capillaries
surrounding the Loop of Henle, also play a crucial role in maintaining the medullary osmotic gradient necessary for urine
concentration.
CMS Conditions for Coverage Aligned | DaVita Clinical Standards
4
DaVita PCT Basic Training Final Exam
Questions and Answers ()
Verified Answers | CMS & DaVita Clinical Standards Aligned
Section 1: Kidney Anatomy and Physiology
Questions 1-15
Q1: The kidneys receive approximately what percentage of the cardiac output at rest?
A. 5-10%
B. 15-20%
C. 20-25% [CORRECT]
D. 35-40%
Correct Answer: C
Rationale: The kidneys receive approximately 20-25% of cardiac output at rest, which equates to roughly 1,000 to 1,200 mL of
blood per minute through the renal arteries. This high blood flow is essential for the kidneys' primary functions of filtration,
reabsorption, and secretion. This substantial perfusion allows the glomeruli to filter approximately 180 liters of plasma per
day. The remaining options underestimate or overestimate the actual renal blood flow percentage. Options A and B are too low,
while option D is excessively high for resting conditions.
Q2: Which structure is responsible for forming the filtrate during the initial step of urine
formation?
A. Loop of Henle
B. Bowman's capsule and glomerulus [CORRECT]
C. Collecting duct
D. Distal convoluted tubule
Correct Answer: B
Rationale: The glomerulus, enclosed within Bowman's capsule, forms the renal corpuscle and is the site of initial blood
filtration. Hydrostatic pressure within the glomerular capillaries forces water and small solutes across the filtration membrane
into Bowman's capsule, creating the filtrate. The Loop of Henle is responsible for concentrating urine through countercurrent
multiplication. The collecting duct adjusts final urine concentration under the influence of antidiuretic hormone (ADH). The
distal convoluted tubule is involved in fine-tuning electrolyte and acid-base balance.
Q3: A PCT is reviewing a patient's lab results and notes a BUN of 45 mg/dL and a serum
creatinine of 3.2 mg/dL. These values most likely indicate:
A. Adequate kidney function with normal GFR
B. Acute kidney injury or worsening chronic kidney disease with reduced GFR
[CORRECT]
C. Dehydration without renal impairment
D. Protein malnutrition with normal renal clearance
Correct Answer: B
Rationale: Elevated BUN (normal 7-20 mg/dL) and serum creatinine (normal 0.7-1.3 mg/dL for adults) both indicate reduced
glomerular filtration rate (GFR), which is the primary marker of kidney function. A BUN of 45 mg/dL and creatinine of 3.2
mg/dL represent significantly impaired kidney function consistent with acute kidney injury (AKI) or advanced chronic kidney
disease (CKD). While dehydration can elevate BUN, the concomitant rise in creatinine confirms renal impairment. Protein
malnutrition would typically cause a low BUN, not an elevated one. These values require immediate clinical attention and
physician notification per facility protocol.
CMS Conditions for Coverage Aligned | DaVita Clinical Standards
1
,DaVita PCT Basic Training Final Exam (2026/2027) Verified Answers
Q4: Which hormone produced by the kidneys is primarily responsible for stimulating red
blood cell production?
A. Aldosterone
B. Antidiuretic hormone (ADH)
C. Erythropoietin (EPO) [CORRECT]
D. Renin
Correct Answer: C
Rationale: Erythropoietin (EPO) is a glycoprotein hormone produced and released by the kidneys in response to hypoxia. EPO
stimulates the bone marrow to increase red blood cell (RBC) production. In chronic kidney disease, decreased EPO production
leads to anemia of chronic disease, which is why many ESRD patients require EPO-stimulating agents (ESAs) during dialysis.
Aldosterone is produced by the adrenal cortex and regulates sodium and potassium balance. ADH is produced by the posterior
pituitary and regulates water reabsorption. Renin is released by the kidneys but acts on the renin-angiotensin-aldosterone
system to regulate blood pressure, not RBC production.
Q5: The nephron's ability to concentrate urine depends primarily on which mechanism?
A. Active transport in the proximal convoluted tubule
B. Countercurrent multiplication in the Loop of Henle [CORRECT]
C. Osmotic diffusion in the collecting duct
D. Filtration pressure in the glomerulus
Correct Answer: B
Rationale: Countercurrent multiplication in the Loop of Henle is the primary mechanism that creates the medullary osmotic
gradient necessary for urine concentration. The descending limb is permeable to water but not solutes, while the ascending
limb actively transports sodium, chloride, and potassium out, creating a gradient that can reach 1,200 mOsm/L at the tip of the
medulla. This gradient allows the collecting duct, under the influence of ADH, to reabsorb water and produce concentrated
urine. While active transport in the PCT is important for bulk reabsorption, and ADH-mediated water reabsorption in the
collecting duct is the final step, neither creates the concentration gradient itself.
[Select All That Apply]
Q6: Which of the following are normal functions of healthy kidneys? (Select All That
Apply)
A. Regulation of fluid and electrolyte balance [CORRECT]
B. Removal of metabolic waste products [CORRECT]
C. Regulation of acid-base balance [CORRECT]
D. Production of vitamin D active form (calcitriol) [CORRECT]
E. Storage of glycogen for energy reserves
Correct Answer: A, B, C, D
Rationale: Healthy kidneys perform multiple essential functions: (1) regulation of fluid and electrolyte balance by selectively
reabsorbing and secreting ions such as sodium, potassium, calcium, and phosphate; (2) removal of metabolic waste products
including urea, creatinine, and uric acid; (3) regulation of acid-base balance through bicarbonate reabsorption and hydrogen
ion secretion; and (4) production of the active form of vitamin D (1,25-dihydroxyvitamin D3, or calcitriol), which is essential
for calcium absorption and bone metabolism. Glycogen storage is a function of the liver and skeletal muscle, not the kidneys.
Understanding these functions is critical for PCTs because dialysis partially replaces only the waste removal and fluid balance
functions.
CMS Conditions for Coverage Aligned | DaVita Clinical Standards
2
,DaVita PCT Basic Training Final Exam (2026/2027) Verified Answers
Q7: A patient with ESRD presents with a serum potassium level of 6.8 mEq/L. The PCT
should recognize this as:
A. A normal finding in dialysis patients
B. Mild hyperkalemia requiring dietary counseling only
C. A medical emergency requiring immediate intervention [CORRECT]
D. A laboratory error that should be rechecked in one week
Correct Answer: C
Rationale: A serum potassium of 6.8 mEq/L is a critical hyperkalemic value (normal range 3.5-5.0 mEq/L) and constitutes a
medical emergency. Hyperkalemia can cause life-threatening cardiac arrhythmias, including ventricular fibrillation and
asystole. The PCT must immediately notify the nurse or physician, ensure the patient is on a cardiac monitor, and prepare for
emergency dialysis or administration of medications such as calcium gluconate, insulin with dextrose, or kayexalate. This is not
a normal finding even in ESRD patients, and delaying intervention can result in cardiac arrest. CMS Conditions for Coverage
require facilities to have protocols for managing hyperkalemia.
Q8: What is the primary route by which the kidneys regulate blood pressure?
A. Increasing heart rate through vagal stimulation
B. The renin-angiotensin-aldosterone system (RAAS) [CORRECT]
C. Direct neural innervation of the aortic arch
D. Secretion of thyroid-stimulating hormone
Correct Answer: B
Rationale: The kidneys regulate blood pressure primarily through the renin-angiotensin-aldosterone system (RAAS). When
renal perfusion pressure drops, juxtaglomerular cells in the afferent arteriole release renin. Renin converts angiotensinogen to
angiotensin I, which is then converted by angiotensin-converting enzyme (ACE) in the lungs to angiotensin II. Angiotensin II
causes vasoconstriction and stimulates aldosterone release from the adrenal cortex, leading to sodium and water retention,
both of which increase blood pressure. ESRD patients frequently have hypertension due to fluid overload and dysregulated
RAAS, making blood pressure management a key component of dialysis treatment.
Q9: The normal glomerular filtration rate (GFR) for a healthy adult is approximately:
A. 25-50 mL/min
B. 60-90 mL/min
C. 90-120 mL/min [CORRECT]
D. 150-200 mL/min
Correct Answer: C
Rationale: A normal GFR for a healthy adult is approximately 90-120 mL/min/1.73 m2. GFR is the best overall indicator of
kidney function and is used to stage chronic kidney disease. CKD Stage 1 is GFR greater than or equal to 90 with kidney
damage; Stage 2 is 60-89; Stage 3a is 45-59; Stage 3b is 30-44; Stage 4 is 15-29; and Stage 5 (ESRD) is less than 15 mL/min,
at which point renal replacement therapy (dialysis or transplant) is typically required. Most dialysis patients have a GFR below
15 mL/min. PCTs should understand GFR staging because it determines the treatment plan and frequency of dialysis sessions.
CMS Conditions for Coverage Aligned | DaVita Clinical Standards
3
, DaVita PCT Basic Training Final Exam (2026/2027) Verified Answers
Q10: Which segment of the nephron is the primary site of drug and toxin secretion?
A. Glomerulus
B. Proximal convoluted tubule [CORRECT]
C. Ascending Loop of Henle
D. Collecting duct
Correct Answer: B
Rationale: The proximal convoluted tubule (PCT) is the primary site for the active secretion of drugs, toxins, and organic
acids/bases from the peritubular capillaries into the tubular lumen. This is a critical concept for dialysis patient care because
many medications given to ESRD patients require dose adjustments due to impaired secretion and reduced clearance. The PCT
contains specific transport proteins (OAT and OCT families) that actively pump substances into the tubular fluid for excretion.
The glomerulus is the site of passive filtration. The ascending Loop of Henle actively reabsorbs sodium and potassium. The
collecting duct primarily handles water reabsorption under ADH control.
Q11: A dialysis patient's lab shows a phosphorus level of 7.2 mg/dL. What complication is
this patient most at risk for developing?
A. Hypocalcemia and renal osteodystrophy [CORRECT]
B. Hypernatremia and fluid overload
C. Metabolic alkalosis
D. Increased red blood cell production
Correct Answer: A
Rationale: Elevated phosphorus (normal 2.5-4.5 mg/dL) in ESRD patients leads to hypocalcemia because excess phosphorus
binds with serum calcium, lowering ionized calcium levels. This triggers secondary hyperparathyroidism as the parathyroid
glands attempt to raise calcium by releasing PTH, which in turn causes calcium to be leached from bones, leading to renal
osteodystrophy. Management includes phosphorus binders (taken with meals), dietary phosphorus restriction, and possibly
calcimimetics. This is a critical concept for PCTs because they often educate patients about phosphorus-rich foods to avoid and
reinforce medication adherence for phosphate binders.
Q12: The peritubular capillaries surrounding the nephron are primarily involved in:
A. Forming the glomerular filtrate
B. Reabsorbing substances from the tubular fluid back into the blood [CORRECT]
C. Actively secreting hormones into the filtrate
D. Filtering proteins and blood cells from the plasma
Correct Answer: B
Rationale: The peritubular capillaries are the vascular network that surrounds the renal tubules and is primarily responsible
for reabsorbing water, electrolytes, glucose, amino acids, and other essential substances from the tubular lumen back into the
bloodstream. After filtration occurs at the glomerulus, approximately 99% of the filtrate is reabsorbed through the peritubular
capillaries via both active and passive transport mechanisms. The vasa recta, which are specialized peritubular capillaries
surrounding the Loop of Henle, also play a crucial role in maintaining the medullary osmotic gradient necessary for urine
concentration.
CMS Conditions for Coverage Aligned | DaVita Clinical Standards
4
