Blood groups were discovered by Karl Landsteiner when he found out that the red blood cells
had specific substances on their surfaces, then that was used to create blood types.
There are two blood group classifications in humans which are the ABO and the Rh systems.
There are four groups of blood: A, B, AB and 0. Blood type A has the antigen A, blood type B has the B antigen, and O which dont have an antigen on its surface. Each of these groups is either Rh positive or Rh negative, we can conclude that there is eight blood types in total.
Everyone inherits his blood type genetically from their parents. the blood group of each person is described by two alleles:
In this section we will show you how to determine your baby blood type, thats important
to know the parents blood type as each parent will donate one of two ABO genes to their child,
so the child blood type will depend on parents blood type.
In this example we will calculate manually the possible blood type for your child, so lets suppose that your blood group is A Rh+, and your partner's is B Rh-.
These are the steps to calculate the probabilities for possible blood types for your child:
When we should have a blood transfusion we would receive blood of the same ABO and RhD blood group,
But if the same blood group is not available, we might receive another group but it depends on
our blood group.
The table above shows the possible blood transfusions of donors and recipients based on blood type.