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

    Sep 15, 2023 · How Many Blood Types Are There? 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 .

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

    Blood type (or blood group) is determined, in part, by the ABO blood group antigens present on red blood cells. A blood type (also known as a blood group) is a classification of blood, based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells (RBCs).

  4. www.redcrossblood.org › donate-blood › blood-typesBlood Types Explained - A, B, AB and O | Red Cross Blood Services

    There are four major blood groups determined by the presence or absence of two antigens, A and B, on the surface of red blood cells. In addition to the A and B antigens, there is a protein called the Rh factor, which can be either present (+) or absent (–), creating the 8 most common blood types (A+, A-, B+, B-, O+, O-, AB+, AB-).

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  6. byjus.com › biology › blood-groupsBlood Groups | ABO Blood Group & Rh Blood Group Systems - BYJU'S

    The ABO blood group system consists of 4 types of blood group – A, B, AB, and O and is mainly based on the antigens and antibodies on red blood cells and in the plasma.

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

    Jan 16, 2024 · There are four major categories within the ABO group: A, B, O, and AB. Within these groups, there are a further eight blood types. Every 2 seconds, a person in the United States needs...

  8. www.nhs.uk › conditions › blood-groupsBlood groups - NHS

    There are 4 main blood groups (types of blood) – A, B, AB and O. Your blood group is determined by the genes you inherit from your parents. Each group can be either RhD positive or RhD negative, which means in total there are 8 blood groups.

  9. my.clevelandclinic.org › 21213-blood-typesBlood Types: What They Are and Mean for Your Health

    Mar 14, 2023 · There are four main blood types: A, B, AB and O. Blood bank specialists determine your blood type based on whether you have antigen A or B on your red blood cells. They also look for a protein called the Rh factor.