B Negative (B-)

B negative (B-) is rare. It can donate to B and AB patients, positive or negative, and can only receive from B- and O-.

Key traits

• B antigen, no Rh antigen
• Has anti-A antibodies
• Can donate to B+, B-, AB+ and AB-
• Can only receive from B- and O-

Donating this type

• One of the rarest types, so B- donations are very valuable
• B- patients have very few compatible options
• Blood centers issue appeals when supplies of this type run low

This information is general and does not replace advice from a health professional. Your eligibility is always decided at the donor screening on the day of donation. Rules change, so confirm with the American Red Cross or the blood center where you plan to donate.