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Frozen embryo transfer (FET)

The Human Fertilisation and Embryology Authority (HFEA) guidance is that only two embryos (or a maximum of three if the woman is over 40) may be transferred after a treatment cycle.

If the treatment produced more than two (or three) good quality embryos, we can freeze those that aren’t used at extremely low temperature. This ensures that they do not deteriorate over the number of years they are stored for future use.

In a Frozen Embryo Replacement Cycle, we’ll give you medications to prepare your womb to receive these embryos. There’s no need to use hormone injections to stimulate the ovaries.

You’ll have an ultrasound scan to assess the lining of the uterus to see if it is ready to receive the embryo. Once the lining is ready, embryos are thawed and transferred.

The number of embryos to be thawed in any one attempt will be discussed in advance with the Assisted Conception Unit doctor or the embryologist.

The current pregnancy (live birth) rate for frozen embryo transfer is 17%. This compares favourably with the average national rate.

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