Certified Hemodialysis Technologist/Technician Exam Water Treatment and Quality 1 — Questions and Answers
Question 1: What is the maximum allowable level of chloramine in dialysis water according to AAMI standards?
- 0.1 mg/L (Correct answer)
- 0.5 mg/L
- 1.0 mg/L
- 2.0 mg/L
Correct answer: 0.1 mg/L
AAMI standards require chloramine levels in dialysis water to be below 0.1 mg/L to prevent hemolytic anemia.
Question 2: Which test is used to detect chloramine in dialysis water?
- DPD test
- OT test (Correct answer)
- Silver nitrate test
- Nitrazine test
Correct answer: OT test
The OT (orthotolidine) test is used specifically to detect chloramine, while the DPD test detects free chlorine.
Question 3: How often should product water be tested for bacteria in a dialysis facility?
- Daily
- Weekly
- Monthly (Correct answer)
- Quarterly
Correct answer: Monthly
AAMI guidelines require dialysis product water to be tested for bacteria at least monthly.
Question 4: What is the maximum allowable endotoxin level in standard dialysis water?
- 0.25 EU/mL
- 1.0 EU/mL (Correct answer)
- 2.0 EU/mL
- 5.0 EU/mL
Correct answer: 1.0 EU/mL
AAMI standards set the maximum endotoxin level for standard dialysis water at 1.0 EU/mL.
Question 5: Which component of a water treatment system is responsible for removing bacteria and endotoxins through size exclusion?
- Activated carbon
- Reverse osmosis membrane (Correct answer)
- Water softener
- Sediment filter
Correct answer: Reverse osmosis membrane
The reverse osmosis membrane removes bacteria, endotoxins, and most dissolved solids through semipermeable filtration.
Question 6: What is the purpose of a water softener in a dialysis water treatment system?
- Remove chlorine
- Remove bacteria
- Remove calcium and magnesium ions (Correct answer)
- Adjust pH
Correct answer: Remove calcium and magnesium ions
Water softeners use ion exchange to remove calcium and magnesium ions, preventing scale buildup that can damage the RO membrane.
Certified Hemodialysis Technologist/Technician Exam Water Treatment and Quality 1
What is the maximum allowable level of chloramine in dialysis water according to AAMI standards?