B negative blood group problems
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Rare blood group.
Every person has a unique blood type because the immune cells (antigens) on their red blood cells differ. The discovery of blood types in 1901 saved many lives and permanently changed medicine. Four main blood types exist: A, B, AB, or O, and everyone has a positive or negative Rh factor.
Blood types are important because they affect blood transfusions, pregnancy outcomes, and blood donation. This article outlines the different blood types and their practical application in blood donation and medical care.
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How Blood Types Are Determined
Blood is made up of erythrocytes (red blood cells) that bind to oxygen and carry it throughout the body.
How Rare Is My Type?*
Each red blood cell (RBC) has a specific compound that can trigger an immune response; these are called antigens and can be further classified as A, B, AB, or O.
The immune system produces antibodies, identifying and attacking antigens (foreign molecules).
If the wrong blood type is infused, the body can attack the foreign antigen and cause an immune response (transfusion reaction).
There are eight main blood types:
- A positi
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