Frozen embryo transfer (FER/FET)
If you have frozen blastocysts from a previous IVF/ICSI treatment, these frozen embryos can be used for transfer in a later cycle.
This procedure is also known as frozen embryo treatment, frozen transfer, or FER/FET.
Preparation for frozen embryo transfer
Every woman is unique, so we always create a personalised treatment plan for each patient.
However, the procedure for FER/FET is generally the same as for fresh embryo transfer.
Procedure before transfer of the frozen embryo
When your period starts, contact the clinic to plan your cycle. You will be informed about which hormone medications (usually two) to take and when.
Typically, you will need two ultrasound scans:
- First scan: Performed early in your cycle or just before your expected period.
- Follow-up scan: Scheduled to check if your uterine lining is ready for the embryo transfer.
If the scans are not done at the clinic, you must send the results and images to us for guidance.
We can assist you in arranging your scans in the UK through our partner, Sirkka Health, who works with clinics across the country. Learn more about pre-IVF scans in the UK.
The follow-up scan results will determine if your uterine lining is ready and help schedule the frozen embryo transfer date.
How the procedure works
On the day of the transfer, the embryologist begins thawing the frozen embryo shortly before the procedure. They assess the embryo to ensure it has survived the thaw and is in good condition for transfer.
You will need to arrive at the clinic with a full bladder. This helps us achieve a clear image during the ultrasound, which is performed alongside the transfer. The scan, done over the abdomen, allows precise placement of the embryo in the uterus.
The embryo is transferred using a small, soft catheter that is gently inserted into the uterus.
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After FET/FER
Precautions and side effects
There is no need to worry about doing anything wrong in the days following the transfer.
However, it’s important to take it easy and avoid strenuous physical activity or exercise.
Additionally, for 48 hours after the transfer, avoid baths, spas, swimming pools, and seawater to minimise the risk of infection.
The transfer of the frozen embryo is a straightforward procedure, and most people experience no discomfort during or after it. Side effects are very rare.