Short Answer
Blood groups are determined by the presence or absence of specific antigens on red blood cells, inherited from your parents.
Detailed Explanation
A laboratory test called blood grouping (typing) identifies which antigens are present on your red blood cells.
If your blood has:
- A antigen → Group A
- B antigen → Group B
- Both A and B antigens → Group AB
- Neither antigen → Group O
Another test determines whether you have the Rh (D) antigen, making your blood Rh-positive or Rh-negative.
Key Points
- Blood grouping is done using a simple laboratory test.
- Blood group is inherited genetically.
- The test identifies both ABO and Rh type.
- Blood group does not change under normal circumstances.
❤️ Knowing your blood group today can help save a life tomorrow—including your own.
