When you give blood to let you know. Will give you a donor card with your blood type on it
You would need to donate blood with The Blood Connection and it will show up on your donor portal. After you find your blood type, you can match your blood type with your preffered donation type! (ex: A+ is best to give Platelets and O- is best to give Red Cells) Learn more at https://thebloodconnection.org/about-blood/
Agreed, I found out my blood type after my first donation
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