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Frozen Embryo Transfer Embryo freezing, or cryopreservation, allows a couple to have additional attempts at assisted reproductive technology without the expense of ovulation induction and having to undergo an additional egg retrieval procedure. A frozen embryo transfer allows for a second, third or more chances at conceiving from the original cycle. Some couples who conceive on their first attempt use their stored frozen embryos to expand their family. If your cycle yields additional embryos we can offer you the option of cryopreservation for those that were not transferred. |
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To begin a cycle of FET your natural hormones are suspended via an IM injection of Lupron-D. You will be given estrogen and progesterone supplements to create a hospitable hormonal environment for the embryos. Throughout this process you will be monitored via transvaginal ultrasound and bloodwork. When it is determined that your hormones are at the appropriate level and your uterine lining is at a satisfactory thickness you will be notified when your embryos will be thawed for the transfer. The embryo transfer is a very simple procedure and requires no anesthesia. The patient lies on the examining table with her feet in the stirrups and a speculum is placed in her vagina. The embryos are loaded into a sterile catheter. The catheter is inserted through the cervix into the uterus where the embryos are gently expelled into the uterine cavity. The patient remains in a prone position for approximately 45 minutes. She is then discharged, but her activity must be minimal (i.e., bed-rest) for the next 24 hours. She will also be asked to limit her activity for the next week and get plenty of rest. Progesterone support by IM injection and/or vaginal suppository will continue after the FET procedure. The hormone progesterone supports a pregnancy by preparing the endometrial lining so it is receptive to implantation. In one week you will have a blood test to check your hormone levels and further instructions for hormone supplementation will be given later that day. Two weeks after the procedure you will have a blood pregnancy test, a quantitative beta HCG. If the test is positive you will continue hormone supplementation for four to eight weeks. If you do not get pregnant you will discontinue these hormones. Placing frozen embryos in a cyropreservation tank. |
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The embryos are frozen and maintained in liquid nitrogen inside a storage tank. Proper care and an alarm system insure that the embryos remain in their frozen state until they are thawed prior to transfer. Approximately 70% of frozen embryos survive thawing and are suitable for transfer, and our current pregnancy rate with FET is over 40%.