Certified Clinical Hemodialysis Technician (CCHT) Practice Exam

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Which characteristic of a dialyzer explains the solute size that can pass through its membrane?

Surface area

Dialyzer flux

Molecular weight cut off

The characteristic of a dialyzer that specifically explains the solute size that can pass through its membrane is the molecular weight cut-off. This term refers to the maximum molecular weight of solutes that the dialyzer membrane allows to pass through. Each dialyzer has a specific molecular weight cut-off, which is defined by the pore size of the membrane.

In hemodialysis, different solutes have varying molecular weights; therefore, the molecular weight cut-off indicates which substances can be effectively removed from the blood during the therapy. For instance, a dialyzer with a lower cut-off may not effectively eliminate larger molecules like certain toxins or proteins, while one with a higher cut-off can remove a broader range of solutes.

By understanding the molecular weight cut-off, healthcare providers can choose appropriate dialyzers based on the patient’s needs and the targeted solute removal during dialysis treatment.

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