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B-

One of the rarest blood types

B negative is one of the rarest blood types, found in only 2% of people. It has B antigens but lacks the Rh factor. This rare type can donate to all B and AB recipients.

→ Can Donate To

B+✓ Compatible
B-✓ Compatible
AB+✓ Compatible
AB-✓ Compatible

B- blood can be donated to 4 type(s).

← Can Receive From

B-✓ Compatible
O-✓ Compatible

B- blood can receive from 2 type(s).

Rh Factor

Lacks the Rh factor (D antigen). Rh negative individuals have two negative alleles.

Learn more about Rh factor →

Population Frequency by Ethnicity

Caucasian2%
African American1%
Asian0.4%
Hispanic1%

Interesting Facts

  • •Second rarest blood type
  • •Always in high demand due to scarcity
  • •Extremely rare in Asian populations (0.4%)
  • •Can donate to both B+ and B- recipients, plus AB types
  • •B- mothers may need RhoGAM during pregnancy if baby is Rh+

Educational Information: This information is provided for educational purposes only. Always consult with healthcare professionals for medical advice, blood transfusions, and pregnancy-related concerns.