CHT Hemodialysis Technologist 3

Question 1

Which dialyzer membrane characteristic determines its ability to remove middle molecules such as beta-2 microglobulin?

Accepted Answer

Flux (high-flux vs. low-flux)

Answer

High-flux dialyzers have larger pore sizes that allow removal of middle molecules like beta-2 microglobulin, unlike low-flux membranes.

Question 2

A technician notices the conductivity alarm on the proportioning system is reading 16.5 mS/cm instead of the expected 14 mS/cm. The CORRECT action is to:

Accepted Answer

Take the machine out of service and notify the nurse

Answer

Conductivity outside the safe range indicates incorrect dialysate concentration, which is a patient safety emergency requiring immediate machine removal from service.

Question 3

Which anticoagulant is most commonly used during hemodialysis to prevent clotting in the extracorporeal circuit?

Accepted Answer

Heparin

Answer

Unfractionated heparin is the standard anticoagulant for hemodialysis due to its rapid action and reversibility with protamine sulfate.

Question 4

During hemodialysis, the transmembrane pressure (TMP) suddenly increases above the alarm limit. This MOST LIKELY indicates:

Accepted Answer

Clotting in the dialyzer or venous line

Answer

A sudden rise in TMP suggests clot formation increasing resistance to flow in the dialyzer or blood lines.

Question 5

What is the recommended minimum blood flow rate (Qb) for adequate hemodialysis in most adult patients?

Accepted Answer

200–400 mL/min

Answer

KDOQI guidelines recommend a blood flow rate of 200–400 mL/min to achieve adequate solute clearance during standard hemodialysis.

Certified Hemodialysis Technologist/Technician Exam Practice Test

Certified Hemodialysis Technologist/Technician Exam Practice Test

CHT Hemodialysis Technologist 3