What is the difference between AB blood and O blood? Which one is more rare?

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mathscihelp | College Teacher | (Level 2) Adjunct Educator

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There are four major blood groups which include Group A, B, AB, and O. For membership within each blood group, the presence or absence of specific antigens must be identified.

Group AB - Both the A and B antigen is found on red blood cells. Antibody A or B is not found in the plasma. Donors with this blood type can donate to recipients with blood group AB as well as receive blood from all types.

Group O - Both the A or B antigens are not found on red blood cells. Antibody A or B is found in the plasma. Donors with this blood type can donate red blood cells to anyone. This type of donor is referred to as the universal donor.

Group A - Only the A antigen is found on red blood cells. B antibody is found in the plasma. Donors with this blood type can donate blood to recipients with blood group A or AB.

Group B - Only the B antigen is found on red blood cells. A antibody is found in the plasma.Donors with this blood type can donate blood to recipients with blood group B or AB.

In addition, blood group AB is more rare than blood group O.

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