Certified Hemodialysis Technologist/Technician Exam Dialysis Equipment and Troubleshooting 3

Question 1

Which conductivity value would most likely trigger the dialysate bypass alarm?

Accepted Answer

10.0 mS/cm

Answer

A conductivity of 10.0 mS/cm is significantly below the normal range of 13–17 mS/cm and would trigger bypass, indicating improper mixing.

Question 2

What is the recommended dialysate temperature range for standard hemodialysis?

Accepted Answer

36–38°C

Answer

Standard dialysate temperature is maintained at 36–38°C to prevent hypothermia or protein denaturation in the extracorporeal circuit.

Question 3

Which action should be performed before reprocessing a dialyzer for reuse?

Accepted Answer

Test the fiber bundle volume

Answer

Fiber bundle volume (FBV) testing before and after reprocessing determines if the dialyzer retains adequate clearance capacity.

Question 4

During priming of the extracorporeal circuit, approximately how much saline is typically used?

Accepted Answer

300–500 mL

Answer

A standard circuit prime uses approximately 300–500 mL of saline to displace air and prepare the blood lines and dialyzer.

Question 5

What is the most common cause of clotting in the extracorporeal circuit during hemodialysis?

Accepted Answer

Insufficient anticoagulation

Answer

Inadequate heparin or anticoagulation is the most common reason blood clots form in the tubing, dialyzer, or drip chambers.

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