What is the last option for a walking blood bank donor?

The last option for a walking blood bank donor is indeed based on ensuring the safety and eligibility of the donor. Donors without any previous screening represent a specific category where there is no prior assessment of their health history, infectious disease status, or potential for adverse reactions. This lack of screening could pose a risk to both the donor and the recipient, as essential health safeguards have not been established.

In the context of blood donations, it is crucial to have a systematic approach to screening to eliminate potential risks associated with transfusions. The fact that these donors have not been previously screened means they lack the vital health evaluations that would typically ensure they are fit to donate without posing risks of infectious disease or other health complications. Therefore, they are considered the last option for donation in a walking blood bank scenario, as careful screening is a fundamental part of safe blood transfusion practices.