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Blastocyst culture and Blastocyst Embryo
Although blastocyst embryo transfer increases your chance of getting pregnant, it also increases the risk of multiple births. It is more difficult for an embryo to develop into a blastocyst. Therefore, there is the possibility that an IVF cycle will not result in a transfer of any embryos if none of the three day old embryos develop into blastocysts.https://indiraivf.wordpress.com/category/blastocyst-embryo-implant