When excess embryos are created from an IVF cycle, or embryos have been created and are undergoing Pre-Implantation Genetic Screening  (PGS) or diagnosis a Frozen Embryo Transfer (FET) may be required.

After an IVF cycle any remaining embryos are assessed for freezing. Only embryos with the potential to survive freezing and thawing are able to be chosen to undergo this process. During an FET cycle embryos are moved through cryoprotectant solutions and then vitrified (snap frozen) in liquid nitrogen. Fertility Tasmania uses the latest freezing technique and it results in very high survival rates. They are stored in liquid nitrogen (-196 degrees Celsius) and can be stored for up to 10 years, until ready to be used.

There are several ways to undergo FET treatment

1. A Natural FET cycle A natural FET cycle uses the body’s own hormone levels to predict when you are naturally ovulating. This is tracked by taking blood samples over several days and measuring your hormone levels. These results are then used to determine when to thaw and transfer your frozen embryo.
2. A programmed FET cycle may be used in women who do not ovulate naturally or to time the transfer. During this treatment plan, estrogen and then progesterone is given to artificially mimic the hormone levels seen during ovulation. The embryo is then thawed and transferred based on the hormones administered.
3. Ovulation induction using medication or injectable hormone medication called FSH can also be used in women who do not ovulate naturally. Tracking is similar to a natural cycle. Your fertility Tasmania team will guide you through the cycle.
4. Ultra Long Down Regulation prior to FET is a specific treatment used for medical reasons in a small number of women. Your Fertility Tasmania doctor will advise if this is appropriate for you.