CHT Certified Hemodialysis Technologist/Technician 4

Question 1

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

Accepted Answer

Unfractionated heparin

Answer

Unfractionated heparin is the standard anticoagulant for hemodialysis circuits due to its short half-life and reversibility with protamine sulfate.

Question 2

A technician notices the venous pressure alarm is consistently high during a treatment. This most likely indicates:

Accepted Answer

Stenosis or clotting near the venous needle site

Answer

Elevated venous pressure indicates resistance to blood return, commonly caused by stenosis, needle malposition, or clotting at the venous access site.

Question 3

Hemolysis during hemodialysis can be caused by:

Accepted Answer

Kinked blood tubing or excessive blood pump speed

Answer

Mechanical destruction of red blood cells can occur due to kinked tubing, stenotic needles, or excessively high pump speeds creating shear stress.

Question 4

The buttonhole cannulation technique for AVF access involves:

Accepted Answer

Inserting needles into the same tract using a blunt needle after the tract forms

Answer

Buttonhole technique creates a consistent scar tunnel allowing blunt needle entry, reducing hematoma risk and patient discomfort.

Question 5

Which dialyzer membrane characteristic most directly affects the removal of middle molecules like beta-2 microglobulin?

Accepted Answer

Pore size (high-flux vs. low-flux)

Answer

High-flux membranes have larger pores that allow convective removal of middle molecules such as beta-2 microglobulin, which low-flux membranes cannot adequately clear.

Certified Hemodialysis Technologist/Technician Exam Practice Test

Certified Hemodialysis Technologist/Technician Exam Practice Test

CHT Certified Hemodialysis Technologist/Technician 4