What is Embryo Freezing?

If there are any good quality spare embryos left over from your treatment cycle, these can be frozen and stored for future use. They can be used if your treatment is unsuccessful or for a sibling pregnancy.

Embryos are frozen by removing the fluid from inside the cells before freezing them in liquid nitrogen. This is called vitrification. Embryos rapidly frozen in this way have excellent survival rates – over 95% – after being thawed. In recent years, success rates using frozen embryos have really improved. We now see very similar success rates using frozen embryos to our fresh IVF cycles.

Embryos are best frozen either on Day 1 or Day 5 after egg collection. Only top-quality embryos can survive the process.

Fertility Preservation Services

Fertility preservation gives you the option of becoming a parent in the future, if you wish. We can freeze eggs, sperm or embryos in a number of different situations.

We have a fast track pathway for oncology patients who are about to undergo chemotherapy or radiotherapy and wish to freeze their eggs or sperm to preserve their fertility.

We also help people who are transitioning, as well as people preserving their fertility for social reasons.

More fertility preservation articles

Fertility Preservation Services

Social Egg Freezing

If you’re worried about your biological clock but aren’t yet ready to start a family, we offer a Social Egg Freezing program. 

Egg freezing for oncology patients

We’ll offer you an appointment within 48 hours of you contacting us. They will carry out a rapid assessment of your situation and discuss your options for fertility preservation and storage.

Fertility preservation before transitioning

We believe that all trans and non-binary people should be given the option to preserve their fertility.

Human Fertilisation Embryo Authority

More information about egg freezing can be found on the Human Fertilisation & Embryology Authority (HFEA) website.