One of the possibilities within the Informed Consent is to donate your embryos to another patient/s for reproductive purposes. These embryos become part of the Centre's own embryo bank. The donation of embryos will be made by the Centre to the recipient patient/couple, who will be reminded of the free, secret and anonymous nature of embryo donation and its nature as a voluntary, altruistic and disinterested act. Likewise, in your case, you will not be able to know to whom the embryos have been donated.
Read the full article on: What happens to the excess unused embryos after an IVF treatment? ( 78).

José Luis de Pablo
B.Sc., M.Sc., Ph.D.
Senior Clinical Embryologist on Fertility Madrid and ART Reproduccion
Double Degree in Biology and Biochemistry from the University of Navarra. Master’s Degree about the Theoretical Basis and Laboratory Procedures in Assisted Reproduction from the University of Valencia (UV). Senior Clinical Embryologist from the ESHRE and ASEBIR Certification in Clinical Embryology. More than 15 years of experience as the director of IVF labs.