Egg donation is a complex procedure from the medical point of view. At first, it is necessary for both the egg donor and the recipient to undergo a hormonal treatment in order to increase the chances for success. On the one hand, the donor goes through a process called controlled ovarian stimulation (COS) to produce multiple oocytes. On the other hand, the egg donor recipient has to get her endometrial lining ready to ease embryo implantation.
Donor eggs are obtained by means of follicle puncture or ovum pick-up (OPU). Then, they are fertilized in vitro to produce embryos. The embryo with the greatest quality will be transferred to the recipient's uterus with the purpose of achieving a pregnancy.
Within two weeks later, the presence of the hCG hormone in blood will be analyzed to see whether pregnancy has occurred or not. If the result of the test is positive, then the first ultrasound scan will be scheduled.
