What is a blastocyst? What advantages are there to transferring the embryo on day 5?

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:

 

  • It makes a better selection of embryos possible. Embryos which reach this stage offer a better implantation capacity due to the fact that they have overcome possible development hurdles which are frequently produced in the early stages. It is for that reason that we limit transfers to 1 blastocyst (or maximum 2), reducing the risk of multiple births.
  • It allows a more physiological synchronisation between the embryonic phase and the responsiveness of the endometrium.
  • 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.

Contact Instituto Bernabeu

Our clinics

IB Alicante. Spain

IB Alicante. Spain

965 15 40 00

 

IB Elche. Spain

IB Elche. Spain

966 66 44 11

 

IB Cartagena. Spain

IB Cartagena. Spain

968 32 15 20

 

IB Benidorm. Spain

IB Benidorm. Spain

965 85 32 50

 

IB Albacete. Spain

IB Albacete. Spain

967 10 00 55

 

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