It's a requirement at Red Cross but it's just a recommendation at Vitalent- anyone can do anything but they have "ideal" donation types for each blood type.
https://www.vitalant.org/blog/blood-donation-basics/power-red-donation
https://www.vitalant.org/learn/blood-types
It's a requirement at Red Cross but it's just a recommendation at Vitalent- anyone can do anything but they have "ideal" donation types for each blood type.
https://www.vitalant.org/blog/blood-donation-basics/power-red-donation
https://www.vitalant.org/learn/blood-types