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  2. www.verywellhealth.com › blood-types-7967031Blood Types: Main Groups, Most Common, and Rarest

    Sep 15, 2023 · The ABO system has four major blood types: A, B, AB, and O. Blood types are further categorized by the presence (positive or +) or absence (negative or -) of the Rh(D) antigen on the surface of their red blood cells, also known as the Rh factor. This produces the eight major blood types.

    • Nancy Lebrun

  3. www.britannica.com › science › ABO-blood-group-systemABO blood group system | Definition, Blood Type, & ABO ...

    Sep 7, 2024 · ABO blood group system, the classification of human blood based on the inherited properties of red blood cells (erythrocytes) as determined by the presence or absence of the antigens A and B, which are carried on the surface of the red cells. Persons may thus have type A, type B, type O, or type AB blood.

    • The Editors of Encyclopaedia Britannica

  4. en.wikipedia.org › wiki › ABO_blood_group_systemABO blood group system - Wikipedia

    ABO blood group antigens present on red blood cells and IgM antibodies present in the serum. The ABO blood group system is used to denote the presence of one, both, or neither of the A and B antigens on erythrocytes (red blood cells). [1]

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  6. www.ncbi.nlm.nih.gov › books › NBK580518ABO Blood Group System - StatPearls - NCBI Bookshelf

    Sep 9, 2023 · The A and B blood group antigens are oligosaccharide antigens generated by reactions catalyzed by glycosyltransferases. The expression of these antigens determines the blood type of the patient. The human ABO gene is found on chromosome 9; it spans over 18 kilobases and is made up of 7 coding exons.

    • Eleny C. Romanos-Sirakis, Diana Desai
    • 2023/09/09

  7. sciencenotes.org › blood-types-a-b-ab-o-rhBlood Types – A, B, AB, O, Rh - Science Notes and Projects

    Nov 28, 2023 · The ABO blood group system is the primary blood type classification system. It categorizes blood into four main types: Type A: Has A antigens on the red cells and anti-B antibodies in the plasma. Type B: Has B antigens with anti-A antibodies in the plasma. Type AB: Has both A and B antigens, but no anti-A or anti-B antibodies.

  8. en.wikipedia.org › wiki › Blood_typeBlood type - Wikipedia

    The two most important blood group systems are ABO and Rh; they determine someone's blood type (A, B, AB, and O, with + or − denoting RhD status) for suitability in blood transfusion. Blood group systems.

  9. www.medicalnewstoday.com › articles › 218285Blood types: What are they and what do they mean?

    Jan 16, 2024 · The ABO system is the best known way of classifying blood types. In this system, there are eight main types. O positive is the most common, and AB negative is the rarest.