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Navigating the challenges of Bombay phenotype (Oh) and twin pregnancy; a case report and literature review

Bombay phenotype (Oh) is a rare blood group and poses unique challenges during pregnancy, including an adequate supply of blood products in case of postpartum hemorrhage (PPH) and the risk of hemolytic disease of the fetus and newborn (HDFN). Case reports of antenatal care in this cohort are scarce. Herein, we present a case of twin pregnancy in an Oh woman and outline her multidisciplinary management. We summarize the literature to better inform decision‐making and patient blood management in the antenatal care of Oh women.