CHT Certified Hemodialysis Technologist/Technician 2

Question 1

Which type of vascular access has the highest long-term patency rate for hemodialysis?

Accepted Answer

Arteriovenous fistula (AVF)

Answer

AVFs have the highest long-term patency and lowest infection risk, making them the preferred vascular access for hemodialysis.

Question 2

A patient's pre-dialysis BUN is 80 mg/dL and post-dialysis BUN is 20 mg/dL. What is the URR?

Accepted Answer

75%

Answer

URR = (pre-BUN − post-BUN) / pre-BUN × 100 = (80 − 20) / 80 × 100 = 75%.

Question 3

Ultrafiltration in hemodialysis refers to the removal of:

Accepted Answer

Excess fluid by convection

Answer

Ultrafiltration removes excess fluid from the blood via convective transport driven by transmembrane pressure.

Question 4

Which electrolyte imbalance is most immediately life-threatening during dialysis if not corrected?

Accepted Answer

Hyperkalemia

Answer

Severe hyperkalemia can cause fatal cardiac arrhythmias and is a primary indication for emergent dialysis.

Question 5

What is the purpose of the dialysate bicarbonate concentration during hemodialysis?

Accepted Answer

To correct metabolic acidosis

Answer

Bicarbonate in dialysate diffuses into the blood to buffer acids and correct the metabolic acidosis common in ESRD patients.

Certified Hemodialysis Technologist/Technician Exam Practice Test