A blood type (or blood group) is a characteristic of specific substances on the surface of red blood cells, the two most important classifications to describe blood types in humans are ABO and the Rhesus factor (Rh factor).ABO blood group system:
The discovery of human ABO blood groups was made in 1901 by the famous Austrian scientist Dr. Karl Landsteiner. He divided the blood group
|into four categories being A, B, AB, O. There are two antigens and two antibodies that are mostly responsible for the ABO types.The
specific combination of these four components determines an individual's
type in most cases. The ABO system is the most important blood
group system in human blood transfusion.
Rhesus blood group system:
The Rh blood group is one of the most complex blood groups known in humans.it has become second in importance
only to the ABO blood group in the field of transfusion medicine.It was discovered by Landsteiner and Weiner in 1940. they research with the rhesus monkeys on human blood chemistry led to the discovery of the Rh factor. Rh status will be listed as negative (-) or positive (+). the Rh negative (Rh-) gene is also masked by the presence of a Rh positive (Rh+) genotype. Therefore, a person may have a Rh + blood type and can still have an Rh - gene . Furthermore, 2 parents with Rh + blood types can have a child with Rh - blood type.