The woman who is going to donate the eggs will undergo an ovarian stimulation to make several follicles grow instead of just one, which is what would happen in a natural cycle. For this, daily subcutaneous injections will be given. Periodical ultrasound monitoring and blood tests will be carried out to assess the growth of the follicles. This treatment usually lasts around twelve days. When we see on ultrasound that the follicles are ready, the egg collection is programmed. This intervention is a simple procedure that is carried out in the operating theatre, under sedation and usually doesn’t last more than ten or fifteen minutes. 

At the end, the patient will stay for approximately 2 hours under observation in the clinic and will then be able to go home maintaining relative rest for the rest of the day. Our embryology team will collect the eggs, and once the best male donor has been selected, we will proceed with the in vitro fertilization. The choice of the male donor follows rigorous selection protocols consisting of psychological, physical and analytical tests to rule out the presence of diseases. In addition, the maximum physical resemblance to the pregnant mother is sought (the other already provides her genetic information in the egg). 

After fertilization, the embryos remain in special incubators within the laboratory, using special culture media to guarantee their correct development. Throughout the process, embryologists analyse their morphology and the number of their cells to determine the quality of each embryo. The embryos remain in these incubators for five or six days, until they reach the blastocyst stage.