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 what is meaning of rh-factor..

Human blood possesses Rh antigen/Rh factor. Persons who had this antigen are termed as Rh positive (Rh+) and the persons in whom the Rh antigen is absent are designated as Rh  negative (Rh-) people. This is called Rh Grouping.

 

More to know:  During blood transfusion, Rh factor/ Rh antigen is also taken into account. Rh signifies Rhesus factor and it was discovered by Landsteiner and Wiener in 1940 after immunizing the rabbits with the blood of a monkey - Macaca rhesus.

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The Rh (Rhesus) blood group system (including the Rh factor) is one of thirty current human blood group systems. Clinically, it is the most important blood group system after ABO. At present, the Rh blood group system consists of 50 defined blood-group antigens, among which the five antigens D, P, c, E, and e are the most important. The commonly used terms Rh factor, Rh positiveand Rh negative refer to the D antigen only. Besides its role in blood transfusion, the Rh blood group system—specifically, the D antigen—is used to determine the risk of hemolytic disease of the newborn (or erythroblastosis fetalis) as prevention is key.

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