Dialysis Technician Certification Exam Prep |
400+ Verified Practice Questions & Answers
with Detailed Rationales | Hemodialysis, Renal
Physiology & Patient Care Guide
DIALYSIS TECHNICIAN CERTIFICATION EXAM PREP 400 Verified Practice
Questions & Answers with Detailed RATIONALE
SECTION 1: RENAL PHYSIOLOGY & ANATOMY
Q1. What is the primary functional unit of the kidney?
A. Glomerulus B. Renal tubule C. Nephron D. Bowman's capsule E. Loop of Henle
CORRECT ANSWER: C. Nephron RATIONALE: The nephron is the basic
structural and functional unit of the kidney. Each kidney contains approximately 1 million
nephrons, and each nephron is responsible for filtering blood and producing urine
through processes of filtration, reabsorption, and secretion.
Q2. Approximately how many nephrons are present in each kidney?
A. 100,000 B. 500,000 C. 1 million D. 2 million E. 5 million
CORRECT ANSWER: C. 1 million RATIONALE: Each human kidney contains
approximately 1 million nephrons. This large number provides significant reserve
capacity, which is why people can live with one kidney or with reduced renal function
before symptoms of kidney failure appear.
Q3. Which of the following best describes the process of glomerular filtration?
A. Active transport of solutes into the tubule B. Passive movement of fluid from the
peritubular capillaries into the tubule C. Passive filtration of blood plasma from the
glomerulus into Bowman's capsule D. Secretion of waste products from blood into the
tubule E. Reabsorption of glucose from the filtrate
CORRECT ANSWER: C. Passive filtration of blood plasma from the
glomerulus into Bowman's capsule RATIONALE: Glomerular filtration is the
passive process by which hydrostatic pressure forces fluid and small solutes from the
,glomerular capillaries into Bowman's capsule, forming the glomerular filtrate. Large
proteins and blood cells are retained due to size and charge barriers.
Q4. What is the normal Glomerular Filtration Rate (GFR) in a healthy adult?
A. 30–50 mL/min B. 60–80 mL/min C. 90–120 mL/min D. 125–150 mL/min E. 150–180
mL/min
CORRECT ANSWER: C. 90–120 mL/min RATIONALE: A normal GFR in a
healthy adult is approximately 90–120 mL/min/1.73m². GFR is the gold standard for
measuring kidney function. A GFR below 60 mL/min for more than 3 months indicates
chronic kidney disease (CKD).
Q5. Which part of the nephron is primarily responsible for the reabsorption of
glucose?
A. Loop of Henle B. Distal convoluted tubule C. Collecting duct D. Proximal convoluted
tubule E. Glomerulus
CORRECT ANSWER: D. Proximal convoluted tubule RATIONALE: The
proximal convoluted tubule (PCT) reabsorbs approximately 65% of the filtered sodium,
water, and virtually all of the filtered glucose and amino acids. Glucose reabsorption
occurs via sodium-glucose cotransporters (SGLT2) in the PCT.
Q6. What hormone is produced by the kidneys to stimulate red blood cell
production?
A. Aldosterone B. Antidiuretic hormone (ADH) C. Erythropoietin (EPO) D. Renin E.
Calcitriol
CORRECT ANSWER: C. Erythropoietin (EPO) RATIONALE: Erythropoietin
(EPO) is a glycoprotein hormone produced by peritubular cells in the renal cortex in
response to hypoxia. It stimulates the bone marrow to produce red blood cells. In CKD
patients, reduced EPO production causes anemia, necessitating EPO supplementation.
Q7. The kidneys play a key role in activating which vitamin?
A. Vitamin A B. Vitamin B12 C. Vitamin D D. Vitamin E E. Vitamin K
, CORRECT ANSWER: C. Vitamin D RATIONALE: The kidneys convert 25-
hydroxyvitamin D (calcidiol) to its active form, 1,25-dihydroxyvitamin D (calcitriol), via
the enzyme 1-alpha-hydroxylase. Calcitriol promotes calcium absorption from the gut. In
CKD, this conversion is impaired, leading to hypocalcemia and metabolic bone disease.
Q8. Which of the following hormones acts on the collecting duct to increase
water reabsorption?
A. Aldosterone B. Renin C. Erythropoietin D. Antidiuretic hormone (ADH) E. Parathyroid
hormone
CORRECT ANSWER: D. Antidiuretic hormone (ADH) RATIONALE: ADH
(vasopressin), produced in the hypothalamus and released from the posterior pituitary,
acts on V2 receptors in the collecting duct, inserting aquaporin-2 water channels to
increase water reabsorption. This concentrates urine and reduces water loss.
Q9. Which of the following is NOT a function of the kidneys?
A. Regulation of blood pressure B. Production of insulin C. Acid-base balance D.
Electrolyte regulation E. Excretion of waste products
CORRECT ANSWER: B. Production of insulin RATIONALE: Insulin is
produced by the beta cells of the pancreatic islets of Langerhans, not the kidneys. The
kidneys regulate blood pressure (via renin-angiotensin system), maintain acid-base
balance, regulate electrolytes, and excrete waste products like urea and creatinine.
Q10. What is the name of the capillary network surrounding the tubules of the
nephron?
A. Vasa recta B. Glomerular capillaries C. Peritubular capillaries D. Efferent arterioles E.
Afferent arterioles
CORRECT ANSWER: C. Peritubular capillaries RATIONALE: Peritubular
capillaries are a network of capillaries that surround the renal tubules. They receive
blood from efferent arterioles and are responsible for receiving reabsorbed substances
from the tubules and delivering secreted substances to the tubule lumen.
, Q11. The renin-angiotensin-aldosterone system (RAAS) is activated by which of
the following?
A. Increased blood pressure B. Increased sodium levels C. Decreased renal perfusion
pressure D. Increased potassium levels E. Increased GFR
CORRECT ANSWER: C. Decreased renal perfusion pressure RATIONALE:
The juxtaglomerular cells of the kidney secrete renin in response to decreased renal
perfusion pressure, decreased sodium delivery to the macula densa, or sympathetic
stimulation. Renin initiates the cascade that ultimately leads to aldosterone release and
sodium/water retention to restore blood pressure.
Q12. Which segment of the nephron is impermeable to water but actively
transports sodium chloride?
A. Proximal convoluted tubule B. Descending limb of the Loop of Henle C. Ascending
limb of the Loop of Henle D. Collecting duct E. Distal convoluted tubule
CORRECT ANSWER: C. Ascending limb of the Loop of Henle
RATIONALE: The thick ascending limb of the Loop of Henle is impermeable to water
but actively transports NaCl out of the tubular lumen into the interstitium using the Na-K-
2Cl cotransporter (NKCC2). This creates the medullary concentration gradient
necessary for urine concentration.
Q13. What is the normal range for serum creatinine in adult males?
A. 0.2–0.5 mg/dL B. 0.6–1.2 mg/dL C. 1.5–2.5 mg/dL D. 2.0–3.0 mg/dL E. 3.5–5.0
mg/dL
CORRECT ANSWER: B. 0.6–1.2 mg/dL RATIONALE: Normal serum
creatinine in adult males is 0.6–1.2 mg/dL; in adult females, it is slightly lower (0.5–1.1
mg/dL) due to lower muscle mass. Creatinine is a byproduct of muscle metabolism and
is freely filtered by the glomerulus, making it a useful marker of kidney function.
Q14. What is the normal serum BUN (Blood Urea Nitrogen) range?
A. 2–5 mg/dL B. 7–20 mg/dL C. 25–40 mg/dL D. 40–60 mg/dL E. 60–80 mg/dL
CORRECT ANSWER: B. 7–20 mg/dL RATIONALE: The normal serum BUN
range is 7–20 mg/dL. BUN is a product of protein metabolism and is excreted by the
400+ Verified Practice Questions & Answers
with Detailed Rationales | Hemodialysis, Renal
Physiology & Patient Care Guide
DIALYSIS TECHNICIAN CERTIFICATION EXAM PREP 400 Verified Practice
Questions & Answers with Detailed RATIONALE
SECTION 1: RENAL PHYSIOLOGY & ANATOMY
Q1. What is the primary functional unit of the kidney?
A. Glomerulus B. Renal tubule C. Nephron D. Bowman's capsule E. Loop of Henle
CORRECT ANSWER: C. Nephron RATIONALE: The nephron is the basic
structural and functional unit of the kidney. Each kidney contains approximately 1 million
nephrons, and each nephron is responsible for filtering blood and producing urine
through processes of filtration, reabsorption, and secretion.
Q2. Approximately how many nephrons are present in each kidney?
A. 100,000 B. 500,000 C. 1 million D. 2 million E. 5 million
CORRECT ANSWER: C. 1 million RATIONALE: Each human kidney contains
approximately 1 million nephrons. This large number provides significant reserve
capacity, which is why people can live with one kidney or with reduced renal function
before symptoms of kidney failure appear.
Q3. Which of the following best describes the process of glomerular filtration?
A. Active transport of solutes into the tubule B. Passive movement of fluid from the
peritubular capillaries into the tubule C. Passive filtration of blood plasma from the
glomerulus into Bowman's capsule D. Secretion of waste products from blood into the
tubule E. Reabsorption of glucose from the filtrate
CORRECT ANSWER: C. Passive filtration of blood plasma from the
glomerulus into Bowman's capsule RATIONALE: Glomerular filtration is the
passive process by which hydrostatic pressure forces fluid and small solutes from the
,glomerular capillaries into Bowman's capsule, forming the glomerular filtrate. Large
proteins and blood cells are retained due to size and charge barriers.
Q4. What is the normal Glomerular Filtration Rate (GFR) in a healthy adult?
A. 30–50 mL/min B. 60–80 mL/min C. 90–120 mL/min D. 125–150 mL/min E. 150–180
mL/min
CORRECT ANSWER: C. 90–120 mL/min RATIONALE: A normal GFR in a
healthy adult is approximately 90–120 mL/min/1.73m². GFR is the gold standard for
measuring kidney function. A GFR below 60 mL/min for more than 3 months indicates
chronic kidney disease (CKD).
Q5. Which part of the nephron is primarily responsible for the reabsorption of
glucose?
A. Loop of Henle B. Distal convoluted tubule C. Collecting duct D. Proximal convoluted
tubule E. Glomerulus
CORRECT ANSWER: D. Proximal convoluted tubule RATIONALE: The
proximal convoluted tubule (PCT) reabsorbs approximately 65% of the filtered sodium,
water, and virtually all of the filtered glucose and amino acids. Glucose reabsorption
occurs via sodium-glucose cotransporters (SGLT2) in the PCT.
Q6. What hormone is produced by the kidneys to stimulate red blood cell
production?
A. Aldosterone B. Antidiuretic hormone (ADH) C. Erythropoietin (EPO) D. Renin E.
Calcitriol
CORRECT ANSWER: C. Erythropoietin (EPO) RATIONALE: Erythropoietin
(EPO) is a glycoprotein hormone produced by peritubular cells in the renal cortex in
response to hypoxia. It stimulates the bone marrow to produce red blood cells. In CKD
patients, reduced EPO production causes anemia, necessitating EPO supplementation.
Q7. The kidneys play a key role in activating which vitamin?
A. Vitamin A B. Vitamin B12 C. Vitamin D D. Vitamin E E. Vitamin K
, CORRECT ANSWER: C. Vitamin D RATIONALE: The kidneys convert 25-
hydroxyvitamin D (calcidiol) to its active form, 1,25-dihydroxyvitamin D (calcitriol), via
the enzyme 1-alpha-hydroxylase. Calcitriol promotes calcium absorption from the gut. In
CKD, this conversion is impaired, leading to hypocalcemia and metabolic bone disease.
Q8. Which of the following hormones acts on the collecting duct to increase
water reabsorption?
A. Aldosterone B. Renin C. Erythropoietin D. Antidiuretic hormone (ADH) E. Parathyroid
hormone
CORRECT ANSWER: D. Antidiuretic hormone (ADH) RATIONALE: ADH
(vasopressin), produced in the hypothalamus and released from the posterior pituitary,
acts on V2 receptors in the collecting duct, inserting aquaporin-2 water channels to
increase water reabsorption. This concentrates urine and reduces water loss.
Q9. Which of the following is NOT a function of the kidneys?
A. Regulation of blood pressure B. Production of insulin C. Acid-base balance D.
Electrolyte regulation E. Excretion of waste products
CORRECT ANSWER: B. Production of insulin RATIONALE: Insulin is
produced by the beta cells of the pancreatic islets of Langerhans, not the kidneys. The
kidneys regulate blood pressure (via renin-angiotensin system), maintain acid-base
balance, regulate electrolytes, and excrete waste products like urea and creatinine.
Q10. What is the name of the capillary network surrounding the tubules of the
nephron?
A. Vasa recta B. Glomerular capillaries C. Peritubular capillaries D. Efferent arterioles E.
Afferent arterioles
CORRECT ANSWER: C. Peritubular capillaries RATIONALE: Peritubular
capillaries are a network of capillaries that surround the renal tubules. They receive
blood from efferent arterioles and are responsible for receiving reabsorbed substances
from the tubules and delivering secreted substances to the tubule lumen.
, Q11. The renin-angiotensin-aldosterone system (RAAS) is activated by which of
the following?
A. Increased blood pressure B. Increased sodium levels C. Decreased renal perfusion
pressure D. Increased potassium levels E. Increased GFR
CORRECT ANSWER: C. Decreased renal perfusion pressure RATIONALE:
The juxtaglomerular cells of the kidney secrete renin in response to decreased renal
perfusion pressure, decreased sodium delivery to the macula densa, or sympathetic
stimulation. Renin initiates the cascade that ultimately leads to aldosterone release and
sodium/water retention to restore blood pressure.
Q12. Which segment of the nephron is impermeable to water but actively
transports sodium chloride?
A. Proximal convoluted tubule B. Descending limb of the Loop of Henle C. Ascending
limb of the Loop of Henle D. Collecting duct E. Distal convoluted tubule
CORRECT ANSWER: C. Ascending limb of the Loop of Henle
RATIONALE: The thick ascending limb of the Loop of Henle is impermeable to water
but actively transports NaCl out of the tubular lumen into the interstitium using the Na-K-
2Cl cotransporter (NKCC2). This creates the medullary concentration gradient
necessary for urine concentration.
Q13. What is the normal range for serum creatinine in adult males?
A. 0.2–0.5 mg/dL B. 0.6–1.2 mg/dL C. 1.5–2.5 mg/dL D. 2.0–3.0 mg/dL E. 3.5–5.0
mg/dL
CORRECT ANSWER: B. 0.6–1.2 mg/dL RATIONALE: Normal serum
creatinine in adult males is 0.6–1.2 mg/dL; in adult females, it is slightly lower (0.5–1.1
mg/dL) due to lower muscle mass. Creatinine is a byproduct of muscle metabolism and
is freely filtered by the glomerulus, making it a useful marker of kidney function.
Q14. What is the normal serum BUN (Blood Urea Nitrogen) range?
A. 2–5 mg/dL B. 7–20 mg/dL C. 25–40 mg/dL D. 40–60 mg/dL E. 60–80 mg/dL
CORRECT ANSWER: B. 7–20 mg/dL RATIONALE: The normal serum BUN
range is 7–20 mg/dL. BUN is a product of protein metabolism and is excreted by the
