Which of the following is NOT considered a characteristic of a dialyzer?

The characteristic that is not typically attributed to a dialyzer is capacity.

A dialyzer, which is the medical device used in hemodialysis to filter waste products from the blood, is primarily defined by its permeability, surface area, and filtration rate.

Permeability refers to the ability of the dialyzer membrane to allow certain substances to pass through while retaining others, which is crucial for removing toxins effectively. Surface area indicates the size of the membrane available for the transfer of solutes and fluids, influencing the efficiency and speed of the dialysis process. Filtration rate refers to the speed at which the dialyzer can filter blood, impacting the overall treatment time and effectiveness.

While capacity can refer to the volumetric space of the device or its storage, it is not a characteristic that directly pertains to the functioning or effectiveness of a dialyzer in the same way as the other options. Hence, capacity does not play a role in defining how a dialyzer operates in treating patients.