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Outcome of consecutive pregnancies in a patient with Bombay (Oh) blood group.Bhattacharya, Soumo; Makar, Y; Laycock, R A; Gooch, A; Poole, J; Hadley, A; SpR Haematology, Christie Hospital, Manchester, Bristol, UK. (2002-12)A young lady with a rare Bombay (Oh) blood group had two successive uneventful pregnancies. Her serum contained a potent high-titre anti-H and serological as well as chemiluminescence tests, suggesting that the antibody was haemolytic. Her husband was of the normal H status. Theoretically, both babies should have been positive for the H antigen and should have suffered from haemolytic disease of the newborn. This apparent conundrum could be owing to the weak expression of the H antigens on the infant red cells.