A blastocyst is a 5/6 day-old embryo with a complex cellular structure formed by approximately 200 cells.The blastocyst stage is the stadium of development before the implantation of the embryo in the mother’s uterus.

Transferring a blastocyst has the following advantages:

  • Better embryo selection.
  • Improved implantation capacity, they have passed development blockages that occur regularly in early stages.
  • Reduces the risk of multiple pregnancy, it is recommended to transfer 1, maximum 2.
  • Allows for a more physiological synchronization between the embryonic stage and Endometrial receptivity, the phase before the moment of implantation.