ABO Blood group calculator shows what could be the blood group or blood type of a child, given the blood groups of biological parents.
The discovery of A, B, O and combination blood groups by Dr. Karl Landsteiner made it possible to determine a personís blood group based on a characteristic of specific substances on the surface of red blood cells.
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The two most important classifications to describe blood groups in humans are ABO and the Rhesus factor (Rh factor). Knowledge of oneís blood group is important for medical reasons. In case of blood transfusion, it is critical that a person gets the same or compatible blood type.
When describing the Blood type the Rh +ve or -ve is written as O+ve or AB+ve or O-ve or AB-ve. The Rh type is especially important in Pregnancy because, Rh incompatibility that happens when the mother's blood group is Rh negative and her fetus' blood group is Rh positive, can harm the fetus and cause pregnancy complications.
Landsteiner worked out a chart which is the basis of successful blood transfusion today.