H/H BLOOD GROUP SYSTEM: A RARE BLOOD GROUP
It occurs in individuals who have inherited two recessive alleles of the H gene (genotype is hh). These individuals do not fabricate the H carbohydrate that is the pioneer to the A and B antigens, significance that individuals may acquire alleles for either or both of the A and B alleles devoid of being able to express them. Because both parents must carry this recessive allele to convey this blood type to their children, the circumstance mostly occurs in small communities where there is a superior likelihood of both parents of a child either being of Bombay type, or being heterozygous for the h allele and so carrying the Bombay distinctive as recessive. If appropriate blood grouping or testing practices are not followed, it can direct to people with Bombay Blood Group not being detected. This group would be considered as the O group because it wouldn’t illustrate any reaction to anti-A and anti-B antibodies just like am ordinary the O group. When a cross matching with O group is done, then it would show cross-reactivity or incompatibility. Consequently reverse grouping or serum grouping has to be performed to notice this group. 
While the Bombay Blood Group is the rarest blood group, it is enviable to build up cryopreservation facilities for rare donor units. Every blood bank can easily uphold a rare blood type donor file from amongst their regular voluntary donors. If the blood banks can borrow or exchange rare blood units in times of need, a lot of efforts related to rare blood groups like the Bombay Blood Group can be solved. This is only promising if each blood bank has a large numeral of devoted regular voluntary donors.
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