Technically speaking, O negative blood is not the universal donor. A regular O negative cannot donate to a Bombay blood group O(h) lacking the H antigen regular blood type O people have. Hh or the Bombay blood group, is a rare blood type. This blood phenotype was first discovered in Bombay, now known as Mumbai, in India, by Dr. Y. M. Bhende in 1952. It is mostly found in South Asia (India, Bangladesh, Pakistan) and parts of Middle East such as Iran. Individuals with the rare Bombay phenotype (hh) do not express H antigen (also called substance H), the antigen which is present in blood group O. As a result, they cannot make A antigen (also called substance A) or … Continue reading Bombay Blood Group: The Real Universal Donor