B Negative (B−) Blood Group
B− is group B with RhD-negative status. Under standard ABO red-cell rules, group B recipients can receive B or O red cells, and RhD-negative recipients are generally matched with RhD-negative red cells.
Medical information notice: This article explains general blood-group concepts. Actual transfusion decisions are made by qualified clinical and transfusion-service staff after appropriate testing.
What does B Negative (B−) mean?
B− is group B with RhD-negative status. Under standard ABO red-cell rules, group B recipients can receive B or O red cells, and RhD-negative recipients are generally matched with RhD-negative red cells.
Red-cell compatibility
B− red cells can be used for B− and AB− recipients under standard ABO/Rh red-cell compatibility. Final selection requires transfusion-service testing.
Why compatibility testing still matters
RhD is an important blood-group antigen in transfusion medicine. A person who is RhD-negative may form anti-D antibodies after exposure to RhD-positive red cells.
Sources
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