Maturation of embryos to the fifth day stage (blastocysts) and the return of fresh embryos
The fertilization phase begins with the extraction of the mature eggs from the donor ovaries and the provision of sperm by the intended father. The semen is sorted in a laboratory using the ICSI method, also known as the X method. This is the most advanced method of sperm sorting, and it makes it possible to select the highest quality sperm cells to be used for fertilization.
After fertilization of the eggs with the selected sperm cells, the embryos created are grown under laboratory conditions to a stage where they can be returned to the uterus. The clinics we work with operate in a five-day fetal method (blastocysts). This is an innovative method that has recently been proven to have the highest chances of a successful pregnancy.
After the fifth day of maturation, two fresh embryos are returned to the surrogate’s uterus, who then waits 14 days for a pregnancy test. The rest of the embryos created by fertilization are frozen for future use. If the pregnancy is not absorbed, another return, this time of the frozen embryos, is performed within about a month and a half to two months. Once the pregnancy is successfully absorbed, they move on to the pregnancy follow-up phase.