Surrogacy is based on the same principles as in cycles using donor eggs. A woman who receives eggs undergoes an IVF cycle. At the same time, the surrogate mother’s uterus is being prepared for implantation with estrogen and progesterone preparations. The eggs are extracted during an outpatient procedure under light anesthesia. The eggs are fertilized with the sperm of the patient’s husband and cultured for several days. On the day of transfer, the embryos with the highest implantation potential are placed in the uterine cavity of the surrogate mother. The number of transferred embryos depends on the age of the woman from whom the eggs were obtained and on the quality of the embryos obtained.
The percentage of pregnancy in cycles with surrogacy mainly depends on the age of the woman from whom the eggs were obtained. In cases where donor eggs and a surrogate mother are used, that is, when the quality of the eggs and the condition of the uterus are optimal, the effectiveness of treatment is the highest in modern reproductive medicine, reaching 70−75%.