A blastocyst is an embryo which has been left to develop until day 5 or 6 and presents a complex cellular structure formed by approximately 200 cells. The blastocyst phase is the development stage prior to implantation of the embryo in the mother’s uterus.
Transferring a blastocyst on day 5+ has the following advantages:
Current Spanish Law allows for day 5 transfers, which facilitates the correct supervision of embryo development and the transfer of only the embryos selected by Nature to reach an optimum state of development, which in turn allows for a higher implantation rate.
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