（ oh no, what is her baseline here. who are you, mysterious (apparent) immortal... ）
Well...
If a person (let's say their blood type is A-) loses too much blood after an injury, they enter something called hypovolemic shock (which inhibits the flow of oxygen and nutrients to the vital organs) that can be fatal if left untreated.
（ should she mention systolic and diastolic pressures...? too much? ）
So, if they can be brought to a hospital or clinic in time, and that hospital or clinic has access to the proper storage methods, blood screening and typing, and the necessary equipment, a transfusion of another compatible blood type (O- or A-) can be given to them intravenously. It sort of tricks the body into thinking it's the person's own blood, and can help to stabilize them.
It's not a cure-all, and it won't always work to save the person if the damage is too extensive or the blood loss can't be stopped, but it's one more tool that a doctor should have access to to help their patients.
no subject
Well...
If a person (let's say their blood type is A-) loses too much blood after an injury, they enter something called hypovolemic shock (which inhibits the flow of oxygen and nutrients to the vital organs) that can be fatal if left untreated.
（ should she mention systolic and diastolic pressures...? too much? ）
So, if they can be brought to a hospital or clinic in time, and that hospital or clinic has access to the proper storage methods, blood screening and typing, and the necessary equipment, a transfusion of another compatible blood type (O- or A-) can be given to them intravenously. It sort of tricks the body into thinking it's the person's own blood, and can help to stabilize them.
It's not a cure-all, and it won't always work to save the person if the damage is too extensive or the blood loss can't be stopped, but it's one more tool that a doctor should have access to to help their patients.
Whew! Sorry, that got long-winded. Any questions?