CHBT Reuse and Disinfection Protocols

Question 1

What is the primary justification for dialyzer reuse programs in hemodialysis?

Accepted Answer

Cost reduction and potential improvement in biocompatibility due to protein coating of the membrane reducing first-use syndrome

Answer

Dialyzer reuse reduces facility costs and may reduce first-use syndrome. Protein deposition on the membrane during first use creates a more biocompatible surface for subsequent uses. However, reuse programs require strict protocols to maintain safety and efficacy.

Question 2

Which test is performed to determine if a reused dialyzer is still suitable for patient use?

Accepted Answer

Total cell volume (TCV) test to verify at least 80% of original fiber bundle volume is maintained

Answer

The total cell volume (TCV) measures the volume of the hollow fiber bundle. A minimum of 80% of the original (new) TCV must be maintained for the dialyzer to be reused. Values below 80% indicate clotting or fiber collapse reducing dialysis efficiency.

Question 3

What is the most commonly used disinfectant for dialyzer reprocessing in the United States?

Accepted Answer

Peracetic acid/hydrogen peroxide mixture (e.g., Renalin)

Answer

Peracetic acid-based disinfectants (like Renalin) are now the most common, having largely replaced formaldehyde due to toxicity concerns. They provide effective germicidal action and break down into non-toxic byproducts (acetic acid, oxygen, and water).

Question 4

Before a reprocessed dialyzer is returned to a patient, what must be verified to ensure patient safety?

Accepted Answer

Residual disinfectant must be tested and confirmed below safe threshold levels before connecting to the patient

Answer

Residual disinfectant testing is mandatory before patient use. Disinfectant remaining in the circuit at connection can cause severe adverse reactions (hemolysis with peracetic acid, formaldehyde toxicity). The dialyzer is also flushed and primed before use.

Question 5

What information must be labeled on a reprocessed dialyzer?

Accepted Answer

Patient name/ID, number of previous uses, date of last reprocessing, and disinfectant used

Answer

AAMI and CMS standards require reprocessed dialyzer labels to include patient identification, number of prior uses, date/time of reprocessing, and the disinfectant used. This ensures the correct dialyzer is used for the correct patient and use limits are tracked.

CHBT - Certified Hemodialysis Bio-Medical Technician Practice Test

CHBT - Certified Hemodialysis Bio-Medical Technician Practice Test

CHBT Reuse and Disinfection Protocols