A maximum of 2 embryos are transferred to expectant mothers. If the number of embryos from the expectant mother is more than 2, the remaining embryos can be frozen for later use. Thus, even if the patient has or has not had a pregnancy, a second chance of pregnancy can be achieved with frozen embryos.
Embryos are frozen using a variety of different methods such as slow and fast freezing, vitrification. The freezing method is decided by evaluating many factors such as the patient’s history, the number and quality of the embryos. Frozen embryos are stored in special tanks containing liquid nitrogen at a temperature of -196ºC. Freezing and thawing processes are carried out with the written and verbal consent of both couples.
When the patient wants to use his frozen embryos, after an easy preparation period in which the patient’s intrauterine tissue (endometrium) is prepared, the embryos are thawed and the best quality of the living embryos and those that continue to divide are left in the uterus of the expectant mother with the help of a catheter. The next process proceeds in the same way as the IVF attempt.
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