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Following an IVF treatment cycle, there may be surplus good quality embryos which can be frozen (cryopreserved). These frozen embryos can then be thawed and replaced in a subsequent treatment cycle known as a frozen embryo transfer, or a frozen embryo replacement cycle.
A frozen embryo replacement cycle utilises good quality embryos which were of sufficient quality to have a good chance of surviving being frozen and thawed and of giving you a good chance of achieving a pregnancy.
Frozen embryo replacements are usually managed in an HRT cycle. We will downregulate your cycle with a drug called Buserelin. Once you have had a period and have had an ultrasound scan to ensure you are ready to start the HRT which is prescribed in tablet form to help thicken the endometrium.
After approximately 10 days we will perform another ultrasound scan, if everything is ready we will plan your frozen embryo transfer. The timing of the transfer is important. The embryo(s) are thawed in conjunction with the cycle approximately 6 days later after you have started your progesterone pessaries. Not all embryos survive the freeze-thaw process and occasionally we find that no embryos have survived the thawing process. As an average we expect approximately 90% of vitrified blastocysts frozen at the centre to survive the freeze thaw process.
For more information or if you have any queries, speak to your consultant.
