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  2. 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- ). Click on a blood type below to learn more. Group A.

    • O+, O

      Type O negative is the universal blood type used for...

    • B+, B

      Type B Positive. About 9% of the population have B positive...

    • Ab+, Ab

      Less than 4% of the U.S. population have AB positive blood....

    • Type a Blood

      The importance of knowing your blood type is to prevent the...

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    All blood does the same thing, but not all blood is the same. Blood types classify blood so healthcare providers can determine whether one person’s blood is compatible with another’s. Blood transfusions and organ transplants depend on donors and recipients having compatible blood types. Blood types include A, B, AB and O.

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    How does blood type affect pregnancy?

    A fetus may inherit its Rh factor (either positive or negative) from either parent. There may be problems if you’re Rh negative and carrying a fetus with blood that’s Rh positive. During your first visit to your obstetrician, you’ll take a blood test to determine your blood type and screen for antibodies. If your body reacts to Rh-positive red blood cells, your anti-Rh antibodies can begin to attack the fetus’s red blood cells. To prevent this from happening, you’ll receive Rh immunoglobulin (RhIg). RhIg is a medicine that blocks antibodies from attacking the fetus’s blood.

    Can your blood type change?

    Usually, you’ll have the same blood type all of your life. In rare cases, however, blood types can change. The change usually relates to unique circumstances, such as having a bone marrow transplant or getting certain types of leukemia or infections. Not all of these changes in blood type are permanent. A note from Cleveland Clinic It’s useful to know your blood type. If you’re ever in a position where you need a blood transfusion, determining your blood type will be an essential first step. Knowing which blood types are compatible with yours allows your provider to keep you safe should you ever need blood. The good news is that you don’t need to understand all the microscopic cell markers that come into play to safely donate or receive blood. The blood collection centers of the American Red Cross and local hospital blood bank specialists have controls and safeguards in place to ensure the safety of the blood donation process. Care at Cleveland Clinic Find a Primary Care Provider Schedule an Appointment Medically Reviewed Last reviewed by a Cleveland Clinic medical professional on 03/14/2023. Learn more about our editorial process.

  3. Mar 29, 2024 · Only 7% of the population has type O negative blood, while 38% has O positive blood, the most common blood type. O negative is the universal blood type. O positive red blood cells are not universally compatible to all types, but they are compatible to any red blood cells that are positive (A+, B+, O+ and AB+).

  4. 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. A and B antigens are sugars.

    • Nancy Lebrun
  5. Type B Positive. About 9% of the population have B positive blood. B positive red blood cells can be given to both B positive and AB positive patients. B positive patients can receive blood from B positive, B negative, O positive and O negative donors.

  6. Jun 21, 2022 · If you have B antigens, you have a B blood type. Some people have both A and B antigens, giving them AB blood. And people with an O blood type have neither A nor B antigens. Each of those types are further broken down based on their Rh factor. For example, some people have A positive blood while others have A negative.

  7. receive B+ blood type. Why do I have the B-positive blood type? Like your eye and hair color, your blood type is inherited from your parents. Your ABO blood group depends on your parents’ ABO blood group. Whether you have positive or negative blood doesn’t factor into determining your ABO blood group.

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