Embryo Freezing – Embryo Cryopreservation

Who Are the Candidates for Frozen Embryo Transfer?

  • Patients whose embryos are frozen due to the risk of hyperstimulation or because the uterus is unsuitable for transfer and fresh transfer is not made,
  • After genetic testing of embryos,
  • Patients with embryo deposits (embryo pool) due to decreased ovarian reserve
  • Patients whose embryos need to be frozen until the next process in cases where the hormones for the transfer do not come out as desired,

Preparing the Womb for Frozen Embryo Transfer

The eggs that grow during the fresh embryo transfer and the hormones secreted from the ovaries in the period after the egg retrieval process prepare the uterus for embryo transfer; but more practically, the uterus is prepared with the help of drugs containing the hormones estrogen and progesterone for ovulation. Also, the age of the uterus and embryos is equalized. Embryos that are thawed on the same day are placed in the uterus prepared in this way.


How is Frozen Embryo Transfer Performed?

IVF treatment can be concluded with both fresh and frozen-thawed embryo transfer. Nowadays, most clinics only perform frozen embryo transfer. In our clinic, both fresh and frozen embryo transfers are successfully performed according to the patient's condition. The purpose of frozen embryo transfer is to prepare the uterus to accept pregnancy and to make the embryos ready for transfer and the age of the uterus equal. Theoretically, only a uterus that has been exposed to progesterone for five days can accept a five-day frozen embryo and allow pregnancy to occur. Meanwhile, embryos are frozen with a method called vitrification and with very high health percentages, and then stored in nitrogen tanks at -196 degrees in numbered sections. These numbers are called the embryo address and the address of each embryo is stored in the records. Theoretically, there is no limit to this storage period.