Donors with blood type A and AB are invited to donate slightly less often. Blood cells have a limited shelf life. That is why Sanquin does not keep a large supply of less common blood types (B and AB).
There may be a threatening shortage under certain circumstances. In such cases, the ability to call in additional donors is important.
A donor with blood type B or AB who would like to donate regularly can register as a plasma donor. Plasma has a long shelf life.
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