My understanding is that AB+ can receive AB+ whole blood, but none of the other blood types can receive it. Therefore, the only part of the donation useful to those other blood types is just the plasma.
What they told me was they still have to do some kind of type matching for plasma and AB+ plasma is the kind they can give anyone regardless of type. Shrug. My pulse was too high during intake or whatever that’s called so I will try again next week