The ABO blood group system was the first human blood group system to be discovered by Landsteiner in 1900. The second type of blood group is the rhesus system. There are only two Rh phenotype such as Rh positive and Rh negative, depending on whether Rh antigen is present on the red cell or not. The frequency of ABO and Rh phenotypes in different populations has been extensively studied. The present study was done to assess the prevalence of blood groups in different categories of Northern India and to compare our results with other studies conducted in India and else where in the world and its multipurpose future utilities for the health planners.
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Tulika Chandra (2013) studied this question.
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