Certified Hemodialysis Technologist/Technician Exam Water Treatment and Quality 3

Question 1

What does the term 'rejection rate' refer to in reverse osmosis?

Accepted Answer

Percentage of dissolved solids removed by the membrane

Answer

RO rejection rate is the percentage of dissolved solids that the membrane removes from the feed water, typically 95–99%.

Question 2

Which chemical is NOT required to be tested in dialysis product water by AAMI/ISO standards?

Accepted Answer

Caffeine

Answer

AAMI/ISO standards specify testing for a defined list of chemical contaminants including metals and anions, but caffeine is not among them.

Question 3

What is the purpose of a break point chlorination test in dialysis water treatment?

Accepted Answer

Determine the chloramine removal capacity of carbon tanks

Answer

Break point chlorination testing verifies that the activated carbon tanks can adequately remove chloramine before it reaches the RO membrane.

Question 4

High aluminum levels in dialysis water can cause which serious patient complication?

Accepted Answer

Dialysis dementia and bone disease

Answer

Aluminum toxicity from dialysis water causes dialysis dementia (encephalopathy) and adynamic bone disease.

Question 5

What is the acceptable conductivity range for dialysate used in standard hemodialysis?

Accepted Answer

13–17 mS/cm

Answer

Standard hemodialysate conductivity ranges from approximately 13 to 17 mS/cm, reflecting the ionic concentration of properly diluted concentrate.

Certified Hemodialysis Technologist/Technician Exam Practice Test