Certified Hemodialysis Technologist/Technician Exam Dialysis Adequacy and Prescription

Question 1

What does the term 'Kt/V' measure in hemodialysis adequacy?

Accepted Answer

Dose of dialysis delivered, representing urea clearance relative to urea volume of distribution

Answer

Kt/V is a dimensionless index of dialysis adequacy where K = dialyzer clearance, t = treatment time, and V = volume of distribution of urea.

Question 2

What is the minimum single-pool Kt/V (spKt/V) recommended by KDOQI for thrice-weekly hemodialysis?

Accepted Answer

1.2

Answer

KDOQI guidelines recommend a minimum spKt/V of 1.2 per session for patients on thrice-weekly hemodialysis.

Question 3

URR (urea reduction ratio) is calculated as:

Accepted Answer

(Pre-BUN − Post-BUN) ÷ Pre-BUN × 100

Answer

URR = (Pre-BUN − Post-BUN) ÷ Pre-BUN × 100, expressing the percentage reduction in blood urea nitrogen during a dialysis session.

Question 4

A minimum URR of what percentage is recommended for adequate hemodialysis?

Accepted Answer

65%

Answer

A URR of at least 65% is the recommended minimum for adequate dialysis, correlating with a Kt/V of approximately 1.2.

Question 5

Which blood sample timing is critical for accurate Kt/V calculation?

Accepted Answer

Post-dialysis sample drawn immediately after stopping the blood pump with a slow-flow technique

Answer

The post-dialysis BUN sample must be drawn at low blood flow (approximately 50–100 mL/min) immediately after stopping to avoid cardiopulmonary recirculation affecting results.

Certified Hemodialysis Technologist/Technician Exam Practice Test

Certified Hemodialysis Technologist/Technician Exam Practice Test

Certified Hemodialysis Technologist/Technician Exam Dialysis Adequacy and Prescription