A Frozen Embryo Transfer (FET) involves thawing and transferring a previously frozen embryo into the uterus. Careful preparation of the uterine lining helps create the optimal environment for implantation and pregnancy.
A Frozen Embryo Transfer (FET) involves thawing and transferring a previously frozen embryo into the uterus. Careful preparation of the uterine lining helps create the optimal environment for implantation and pregnancy.
Frozen Embryo Transfer (FET) is a procedure during which a previously frozen embryo is thawed and transferred into the uterus.
Embryos may have been created through IVF or ICSI treatment, egg donation, fertility preservation, PGT treatment or surrogacy arrangements before being frozen and stored for future use.
The aim of treatment is to transfer an embryo into a receptive uterine environment at the optimal stage of development to maximise the chance of implantation and pregnancy.
Embryos may be frozen for a number of reasons, including:
In many cases, freezing embryos allows embryo transfer to take place in a later cycle when the uterine lining can be prepared separately from ovarian stimulation.
Your fertility specialist will recommend the most appropriate treatment strategy based on your individual circumstances.
What is the difference between a natural and medicated frozen embryo transfer cycle?
In a natural cycle, embryo transfer is timed to your own ovulation and menstrual cycle. In a medicated cycle, oestrogen and progesterone are used to prepare the uterine lining and control the timing of treatment.
Both approaches can be highly effective. Your fertility specialist will recommend the most appropriate protocol based on your menstrual cycle, medical history and individual circumstances.
Will thawing damage my embryo?
Modern vitrification techniques allow embryos to be frozen and thawed with excellent survival rates. Whilst no laboratory procedure can guarantee survival of every embryo, the vast majority of embryos remain suitable for transfer following thawing. Your embryology team will carefully assess the embryo after thawing and before transfer.
When will I find out whether I’m pregnant or not?
Following embryo transfer, a pregnancy test is usually performed 11–14 days later, depending on the stage of embryo development and the treatment protocol used.
We recommend waiting until the advised test date before testing, as earlier testing can sometimes produce misleading results and unnecessary anxiety.
Is bleeding or discharge normal after embryo transfer?
Light spotting or a small amount of discharge can occur following embryo transfer and is often related to the procedure itself. In many cases, this settles without treatment and does not necessarily indicate the outcome of the cycle.
However, if you experience persistent bleeding, heavy bleeding, significant pain, feel unwell, or have any concerns following your embryo transfer, we encourage you to contact the clinic for advice.
If you require urgent medical attention outside of clinic hours, please contact NHS 24 on 111 or attend your nearest emergency department.
Is there anything that can be done to improve the chance of a successful embryo transfer?
While there is no proven intervention that guarantees implantation, it is important to continue all prescribed medications and follow the advice provided by your clinical team.
Most patients can return to their normal daily activities following embryo transfer. We recommend avoiding strenuous exercise, heavy lifting, smoking, alcohol consumption and exposure to smoky environments. Maintaining a healthy lifestyle, balanced diet and good hydration is encouraged throughout treatment.