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Freezing Eggs For Later Pregnancy

Updated: May 30, 2023

For many reasons, egg freezing can potentially be helpful for various women. These include women who may wish to try to have children at a later date, those with a genetic disorder that could limit their fertility, and cancer patients who may need to undergo chemotherapy.

The process of freezing female eggs has advanced rapidly over the past 10 years, and studies are reporting equally successful fertilisation and embryo development rates for frozen eggs compared to fresh ones. However, it is essential that egg freezing happens only after appropriate counselling, and at City Fertility Centre, we always work hard to educate patients on the realities.

While we have many success stories, there is no guarantee that a particular woman will have a baby down the track, frozen eggs or not. However, the younger the woman is when she freezes her eggs, the better quality they will be and hence the greater chance of a successful pregnancy at a later date.

How to freeze eggs

Egg freezing involves a woman’s mature eggs being developed and removed using standard IVF techniques. This process typically involves three stages of treatment: pituitary suppression, ovarian stimulation and egg retrieval.

What is the process to freeze eggs?

City Fertility Centre uses the “vitrification” method for freezing eggs. The process involves the egg(s) being cooled so rapidly that the water molecules do not have time to form damaging ice crystals and instantly solidify into a glass-like structure. The concept is based upon the idea that if the cell is dehydrated to a certain degree and then cooled fast enough, everything will ”freeze” in place, and damage will not have time to occur.

Compared with the traditional slow-freezing methods, vitrification of eggs at City Fertility Centre is delivering enhanced survival of preserved eggs and fertilisation rates nearing those of freshly retrieved eggs. A study published in Human Reproduction in 2010* also supports this position.

How long can frozen eggs be stored?

City Fertility Centre follows guidelines the National Health and Medical Research Council recommends regarding egg storage. The maximum storage time for which eggs can be kept is 10 years.

Using frozen eggs to get pregnant

When the right time comes to use the frozen eggs, they are thawed and fertilised, and embryos are created. The embryo is transferred back to the woman, and hopefully, a successful pregnancy results. Any extra embryos created can again be frozen for additional attempts if unsuccessful or for siblings if successful.

City Fertility Centre

Deciding to freeze eggs can be a difficult one for some. The counselling staff at City Fertility Centre are available at any time to help patients decide on their treatment.

*Rienzi. L, et al., 2010: “Embryo development of fresh ‘versus’ vitrified metaphase II oocytes after ICSI: a prospective randomised sibling-oocyte study”. Human Reproduction Vol. 25, No.1 pp. 66-73.

Dr David Wilkinson is Mama You've Got This Fertility and IVF Expert from City Fertility. Dr David is a fully accredited fertility subspecialist (FRANZCOG CREI PhD) with extensive experience in all aspects of infertility diagnosis and treatment. Dr David presents at Parents You've Got This Ready to Conceive Masterclass. If you've been trying to fall pregnant, our free masterclass will equip you with essential knowledge!

City Fertility Centre providing advice for freezing eggs


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