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Best Answer: O positive ok for transfusing to all positive types. O negative is a unversal to all types. So you cannot donate blood for an O negative if you are O positive. If you just want to donate plasma then you can donate, just not whole blood.
Report Abuse. Type O-negative blood is called the universal donor type because it is compatible with any blood type and doesn't have any antigens. This is basically just saying that a person with O negative blood could donate their blood to a needy person because it it is universal.I hope this helped.Giggles Â· 8 years ago.ype O-negative blood is called the universal donor type because it is compatible with any blood type and doesn't have any antigens. This is basically just saying that a person with O negative blood could donate their blood to a needy person because it it is universal. I hope this helped. Giggles Â· 8 years ago.