MICROANATOMY

Detailed explanation-1: -Anti-A is found in the serum of people with blood groups O and B. Anti-B is found in the serum of people with blood groups O and A.

Detailed explanation-2: -People with type A blood have anti-B antibodies. People with type B blood have anti-A antibodies. Type O blood contains both types of antibodies. The 2 steps above can accurately determine your blood type.

Detailed explanation-3: -This is because the O blood type does not have the A or B antigen in its red blood cells. The anti-A and anti-B antibodies are found in the plasma of the O blood type which is not transfused with red blood cells.