How do they know how long my donated blood lasts before it is no longer usable? They told me it will be usable for 30 days, does it suddenly become unusable on day 31? Or does it slowly become less effective/usable? And how do they decide it?


I donated for the first time yesterday and now I’m curious 🙂

In: Biology

A regulation is in place to make sure no one accidentally uses actual aged blood. So blood banks are only allowed to *have it available for use* for 30 days and then must dispose of it regardless of actual shelf life.

Blood cells are living things and all living things eventually die. In the body they have a life span of about 100 days. Outside the body that’ll be considerably reduced.

No on day 31 it does not suddenly become unusable, but you have to select a cutoff point.