Frozen Embryo Transfer (FET) is a procedure in which a previously frozen embryo is thawed and transferred into the uterus of a woman as part of an in vitro fertilization (IVF) treatment. The purpose of FET is to achieve pregnancy by using embryos that were created in a previous IVF cycle and stored in a frozen state. The process of freezing and thawing the embryos does not harm them, and the success rates of FET are similar to fresh IVF cycles.
Frozen embryo transfer (FET) is indicated in various circumstances such as:
- Unsuccessful fresh embryo transfer: If the first IVF cycle results in no implantation or miscarriage, FET may be performed to utilize previously cryopreserved embryos.
- Ovarian stimulation concerns: If the patient has medical conditions that prohibit stimulation with fertility drugs, FET may be an option.
- Euploid embryos: If there are extra embryos from a previous cycle that have been tested and found to be chromosomally normal (euploid), FET may be performed.
- Multiple pregnancies: If a patient has a history of multiple pregnancies, FET may be recommended to reduce the risk of another high-risk pregnancy.
- Elective single embryo transfer: Some patients may choose to undergo FET to reduce the risk of multiple pregnancies.
It’s important to note that the indications for FET vary from patient to patient, and a comprehensive evaluation by a fertility specialist is required to determine if it’s the right option for you.
Fresh and frozen embryo transfers are two different methods used in the field of assisted reproductive technology (ART) to help individuals or couples conceive.
In a fresh embryo transfer, the fertilized egg is implanted into the uterus as soon as it is available, usually 2-5 days after fertilization.
In a frozen embryo transfer, the fertilized egg is first cryopreserved (frozen) and then later thawed and transferred to the uterus.
Both methods have their own advantages and disadvantages. Fresh embryo transfers offer a higher pregnancy rate per cycle, but frozen embryo transfers offer more control and flexibility in scheduling the transfer, as well as the ability to perform genetic testing on the embryos before transfer.
The choice of which method to use depends on individual circumstances and should be discussed with a fertility specialist.