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We report the delivery of non-identical twins resulting from the combined transfer of one fresh and one frozen embryo to a 31 year old patient. To our knowledge, this is the first reported case where both a fresh and a frozen embryo implanted in the same cycle led to non-identical twins. We conclude that supernumerary embryos after in-vitro fertilization should be frozen and used in subsequent cycles, with implantation potentials as high as fresh embryos. The possibility of mixing fresh and frozen embryos, though rarely needed, should be considered, particularly when there is only one fresh embryo available for transfer.

Combined fresh and frozen embryo transfer resulting in a twin delivery