When would a reused dialyzer be rejected?

A reused dialyzer may be rejected due to specific criteria that ensure patient safety and dialyzer functionality. In this case, a total Renalin exposure time of 4 hours indicates an excessive duration for the chemical sterilization process. Typically, dialyzers have strict guidelines on exposure times to Renalin or other sterilants to ensure that all potentially harmful pathogens are eliminated without compromising the integrity of the dialyzer fibers. An extended exposure could potentially damage the dialyzer and affect its performance in filtering the blood, making it unsafe for patient use.

In contrast, the other options do not imply immediate rejection of the dialyzer. A total clearance volume (TCV) being 90% of the initial volume may indicate that the dialyzer is still functioning well, as it shows good clearance capabilities. If applied pressure allows the dialyzer to maintain pressure, it means that the dialyzer fibers are intact, confirming that it is in good working condition. A visual inspection revealing a few clotted fibers might suggest that there is some minor clotting, but it does not necessarily render the dialyzer unusable unless clotting severely interferes with its function. Thus, the reasoning behind rejecting a reused dialyzer primarily hinges