Facts about blood grouping

Blood groups and its compatibility
Blood grouping (or blood typing) is based on the presence or absence of specific antigens and antibodies in the blood. Here's a brief overview:

1. A, B, AB, and O Blood Groups:
   - A: Has A antigens on the surface of the red blood cells and B antibodies in the plasma.
   - B: Has B antigens on the surface of the red blood cells and A antibodies in the plasma.
   - AB: Has both A and B antigens on the surface of the red blood cells and no A or B antibodies in the plasma. (Universal recipient)
   - O: Has no A or B antigens on the surface of the red blood cells but has both A and B antibodies in the plasma. (Universal donor)

2. Rh Factor:
   - Rh+: Has the Rh factor (or D antigen) on the surface of the red blood cells.
   -Rh: Does not have the Rh factor.

Therefore, when combining the ABO system with the Rh factor, we have 8 possible blood types: 
A+, A-, B+, B-, AB+, AB-, O+, and O-.


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