The female who is going to donate the eggs will undergo an ovarian stimulation accompanied with medication specifically designed to suit her, to make several follicles grow instead of just one, which is what would happen in a natural cycle. The medicine which consists of daily subcutaneous injections will be administered. 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 are able to visualise on ultrasound that the follicles are ready, the egg collection is organised. 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 making sure to rest for the rest of the day. Once the best male donor has been selected, our embryology team will collect the eggs, and 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. Genetic tests are also done to eliminate any genetic abnormalities. In addition, the maximum physical resemblance to the pregnant mother is sought (the other already provides her genetic information in the egg).