There are various reasons you may want to know your blood group. For example, you may want to know what type of blood you can receive if you ever needed a blood transfusion– If you had group A blood, you can receive group A and O blood; If you had group B blood, you can receive group B and O blood; If you had group AB blood, you can receive groups A,B,AB and O blood; If you had group O blood, you can only receive group O blood.
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