group B

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Definition

Noun: 1. A blood group classification: "Group B" is one of the major classifications in the ABO blood group system. It is defined by the presence of B antigens on the surface of red blood cells and the presence of anti-A antibodies in the plasma.

Usage

"Group B" is used as a specific, uncountable noun to classify a person's blood type within the ABO system. It is often written with a capital 'B'. - Her blood type is Group B. - Patients with Group B blood can receive donations from other Group B or Group O individuals. - The laboratory tested for antigens to determine if it was Group A or Group B.

Advanced Usage
  • "Group B positive/negative" (B+ / B-): This specifies the Rhesus (Rh) factor in addition to the ABO group. "Group B positive" means the blood has the B antigen and the Rh(D) antigen. "Group B negative" means it has the B antigen but lacks the Rh(D) antigen.
    • He is a universal plasma donor for Group B positive recipients because he has Group AB positive blood.
    • It is crucial to match the Rh factor; a Group B negative mother may develop antibodies if carrying a Group B positive baby.
Variants and Related Words
  • Type B: A common synonym for "Group B" in the context of blood typing.
    • The donor card listed her as Type B positive.
  • ABO system: The classification system that includes Group A, Group B, Group AB, and Group O.
  • Antigen: A substance that triggers an immune response. The B antigen defines this blood group.
  • Antibody: A protein produced by the immune system. Individuals with Group B blood naturally produce anti-A antibodies.
Synonyms
  • Type B: (Medical/Common usage) The blood type characterized by B antigens.
  • B group: (Less common) An alternative phrasing.
Related Phrases
  • Universal recipient for Group B: Refers to individuals with Group AB blood, who can receive red blood cells from Groups A, B, AB, and O.
  • Universal donor for Group B: Refers to individuals with Group B blood, who can donate red blood cells to recipients with Group B or AB blood. (Note: This is for red blood cells only; plasma donation compatibility is reversed).
Noun
  1. the blood group whose red cells carry the B antigen

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