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Frozen embryos

How does FET work?

Frozen embryo(s) can be replaced in an artificial cycle or a natural cycl : Our current practice is to use the natural cycle if your menstrual cycle is regular

Natural cycle

This treatment is only suitable for patients with a regular cycle. The cycle is monitored using ultrasound scans and urinary ovulation testing at home from around day 9 of the cycle. When a positive test is achieved you need to inform the centre straight away so that we can plan the exact day of your embryo transfer. Usually no hormone support is necessary after embryos transfer although this is sometimes used depending on the clinical circumstances



Artificial cycle

This is the choice for women having frozen embryo replacement when your cycle is irregular or non existant. You will receive either a one off injection (Prostap) followed by oestrogen tablets (Progynova). This will prepare the lining of the womb (endometrium) for implantation. The development of the endometrium will be assessed by ultrasound scanning. This is performed at intervals during your treatment. When the scan shows that the endometrium is thick enough, we will plan the timing of your embryo transfer. You will be told when to start with the hormone pessaries (Cyclogest) to make the endometrium as receptive as possible to the embryos. If the endometrium does not thicken sufficiently we cannot proceed with the embryo replacement. This is unusual however.


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