We speak of implantation failure when a patient has not achieved pregnancy after 3 cycles of IVF/ICSI with her eggs, or after 2 egg donation cycles,provided that good quality embryos have been transferred, there have been no technical problems during the embryo transfer and there are no obvious problems in the uterus.
One of the treatments for couples with implantation failure is preimplantation genetic diagnosis (PGD) or preimplantation genetic screening (PGS) to rule out chromosomal abnormalities. In these cases, embryos that do not present any chromosomal anomaly that could be the cause of the implantation failures would be transferred to the uterus, that is, it reduces the number of transfers of altered embryos and the number of transfers making the treatment more bearable without so many negatives, besides reducing abortion rates.
