The rarest blood group is _

O negative

B negative

AB positive

AB negative

Type AB- is the rarest of all the blood types, with just 1% of the population having it.
AB- donors are the universal plasma and platelet donor, meaning any patient can receive their plasma and platelets.
AB negative donations are extremely versatile, but because it is the rarest blood type finding new donors can be a challenge.
Plasma from AB negative donations can help treat patients of all blood types, however fresh frozen plasma is only produced from male donations.

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