Dear Mabel,
1) ID bands on the patient is a little step, but not solve the problem of human error........because there is the visual check.
2) When will be solve the problem of identity of patient, another big step, ....but in transfusion there are the different 8 groups of blood bag.
Solution ???
Medical device that check, by mechanical barriers, at first the identity group of patient and then the compatibility of this group.
I think if you look at Medical Device "Blood Safety" you'll find solution to solve problem transfusion ABO incompatible.
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Ciao
Pier Luigi