![]() ![]() Alternatively, in a natural FET cycle, a patient is monitored until. To prepare for the embryo implantation, the prospective mother may receive estrogen pills or injections to build up the lining of the uterus, and then progesterone treatment to make the uterus receptive to the embryo. Fertility teams sometimes freeze embryos at different stages of development. The process is called frozen embryo transfer, or FET. The embryo is thawed using a special solution. During the 2 weeks, the embryologist prepares the frozen embryos. Time to thaw Estrogen injections last for 2 weeks. We also welcome patients who have had embryos created and frozen at other clinics who wish to move their embryos to Salisbury Fertility Centre to complete a Frozen Embryo Transfer cycle with us. With the cycle under control, estrogen medication, via injections, starts 1-3 days after the woman’s period. If you have had embryos created and frozen due to a past medical condition or due to concerns about your age then a Frozen Embryo Transfer cycle might be the next appropriate step for you. If after a fresh IVF treatment cycle you have embryos that have been frozen (cryo-preserved), you can decide to use these in a Frozen Embryo Transfer (FET) cycle. The embryologists will thaw the embryos in accordance with your plan, and then you are ready for the transfer to take place. You would normally have two scans during the treatment. If your endometrium shows a suitable response to the hormones we add in a second hormone to mature the endometrium. The treatment cycle involves using drugs to suppress the natural activity of the ovaries followed by preparation of the endometrium with oestrogen tablets. Once you have decided what you would like to do your treatment is planned by one of our fertility nurses. ![]() The plan will depend on the number of embryos you have in storage, your medical history, your age, the number of embryos which you could have transferred and your own wishes. Depending on the type of cycle you are doing (medicated cycle vs. The first thing you need to do is discuss a thaw plan with one of our embryologists. A FET cycle also begins on Days 2 or 3 of your menstrual cycle. Transvaginal ultrasound is used to guide the placement of the catheter through the cervix and into the uterus. Next, the consultant loads a catheter with the embryos. ![]() This compares favourably with the average national rate.The procedure for Frozen-thawed Embryo Transfer (FET) is similar to the procedure for fresh embryo transfer. The current pregnancy (live birth) rate for frozen embryo transfer is 17%. This ensures that they do not deteriorate over the number of years they are stored for future use.Īlthough we are very selective about the embryos we freeze, only 90% survive after being thawed.Īn advantage of a FET cycle is that we do not need injections to stimulate the ovaries, instead you’ll be given medications to prepare your womb to receive these embryos.ĭuring the procedure, we do an ultrasound scan to help us place the embryos where they have the highest chance of implantation. If the treatment produced more than two (or three) good quality embryos, we can freeze those that aren’t used at extremely low temperature. I’m also including the natural cycle hormone levels to show how a medicated FET protocol mimics a natural cycle. Your doctor or embryologist will discuss the number of embryos to be thawed in any one attempt with you in advance. Medicated FET cycle protocol The below diagram is showing cycle days 1-21 (which can vary) and a fresh ET as a reference (which isn’t showing progesterone administration for simplicity). The Human Fertilisation and Embryology Authority (HFEA) guidance is that only two embryos may be transferred after a treatment cycle. ![]() In a frozen embryo transfer (FET) cycle, we thaw your frozen embryos and transfer one or two of them into the uterus. If you have undergone fertility treatment that has produced an embryo, such as IVF or ICSI, it is possible to freeze embryos not used in that cycle for later use. ![]()
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