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What is the ABO blood group system?

Human BiologyBlood

Quick Answer

The ABO blood group system classifies blood by A and B antigens on red blood cells. The main groups are A, B, AB, and O.

The Full Story

The ABO system is one of the most important human blood group classifications. It depends on which carbohydrate antigens are present on red blood cells and which antibodies are found in plasma. These differences matter for safe blood transfusion and organ transplantation. The system was discovered by Karl Landsteiner in 1901, a breakthrough that transformed transfusion medicine.

Key Facts

1.It has four main groups: A, B, AB, and O
2.Karl Landsteiner identified the ABO system in 1901
3.It is crucial for safe transfusion

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"Why blood types must match before transfusion"