Bombay Blood Group

Published on 07 Oct 2025

• In a rare and complex medical procedure, a 30-year-old woman with the extremely rare ‘Bombay’ (hh) blood group underwent a successful kidney transplant in India.

• First identified in Bombay in 1952, the blood group is exceptionally rare, occurring in approximately one in 10,000 Indians and only one in a million people globally. 

• Also known as ‘hh’ or ‘Oh’ blood group, people with this type lack the H antigen, making them incompatible with all standard blood types, including O-negative, complicating both transfusions and organ transplants.

• The Bombay phenotype is inherited in an “autosomal recessive manner,” requiring two copies of the hh allele from each parent to exhibit the BBG phenotype.

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Keywords:

Bombay Blood Group hh blood group Oh Blood group Blood group Diseases Heriditary diseases Health