Egg Freezing: What It Involves and Who It's For

TL;DR: Egg freezing means taking fertility drugs, having eggs collected under sedation, and storing them frozen for later IVF. Your chance of a baby depends mostly on your age when you freeze and how many eggs are stored, and it is not a guarantee. In the UK, eggs can now be stored for up to 55 years if you renew your consent every 10 years. Ask any clinic for its results for women your age and a fully costed plan.

Maybe you are 33, building a career, and not with someone you want to have children with yet. Maybe a relative keeps asking when you will "settle down", and you keep wondering whether your body has a clock you cannot hear. Or maybe a doctor has just told you that treatment you need could affect your fertility. Egg freezing comes up in all of these conversations, and it is often presented as either a miracle or a waste of money. The truth sits in between. This guide walks through what it involves, who it is for, and how to make a clear-eyed decision.

What is egg freezing?

Egg freezing is a way of preserving your fertility so you can try for a family later. The UK fertility regulator, the Human Fertilisation and Embryology Authority (HFEA), explains that it involves collecting your eggs, freezing them, and thawing them later to use in fertility treatment. The idea is to store eggs while you are younger, because the HFEA notes that a woman's chances of conceiving naturally fall as she gets older, as the quality and number of her eggs drops.

Who is egg freezing for?

There are two broad groups, and the difference matters for funding.

Freezing for medical reasons. Some medical treatments, including some cancer treatments, can affect fertility, and some conditions cause early menopause. The HFEA says that people who need fertility preservation for medical reasons, such as cancer or early menopause, can generally have this on the NHS, depending on where they live. If you are facing treatment like this, ask your team about fertility preservation before treatment starts.

Freezing for non-medical reasons. This is sometimes called social or elective egg freezing: you are freezing eggs because you are not ready to start a family yet. The HFEA says people in this situation generally cannot have it on the NHS, so it is usually self-funded. HFEA data show this group is growing fast, and estimates that at least 16% of egg freezing cycles in 2018 to 2022 were for medical reasons.

Overall, the number of people freezing their eggs in the UK rose from around 700 in 2014 to 5,580 in 2024.

What does the process involve?

The first stages are the same as IVF, which we cover step by step in IVF explained.

1. Stimulation. You take fertility drugs, usually as injections. The HFEA says these boost your egg production and help the eggs mature.
2. Egg collection. When the eggs are ready, they are collected under general anaesthetic or sedation. The HFEA says most patients under 38 have around 7 to 14 eggs collected, though fewer is common if you have a low egg reserve.
3. Freezing. The eggs are frozen, usually by a fast method called vitrification, which the HFEA says is more successful than the slow cooling method.
4. Later use. When you want to use them, the eggs are thawed, and those that survive are fertilised using ICSI, where a single sperm is injected into each egg. The HFEA explains this is needed because freezing makes the outer coating of the egg tougher. Any embryos that develop can then be transferred to the womb.

The main medical risk is ovarian hyperstimulation syndrome (OHSS), when the ovaries over-respond to the drugs. The HFEA notes side effects are usually mild, but OHSS can be serious in rare cases. An ASRM guideline on preventing OHSS lists PCOS among the factors that raise the risk, so if you have PCOS, read our post on PCOS and fertility and raise it with your clinic.

Does age at freezing affect success?

Yes, a great deal. The HFEA says that a patient's chances of conception using frozen eggs depend on their age at the time of freezing and how many eggs were frozen, and that egg freezing is not a guarantee of having a baby.

Reliable success figures for frozen eggs are limited, because relatively few people have come back to use them. The HFEA says that success rates for frozen eggs tend to be quite low and that older data is not comparable to current techniques, so it advises looking at IVF success rates for patients using their own eggs in your age band as a guide. Those show the age effect clearly: in 2024, the UK birth rate per embryo transferred was 38% for patients aged 18 to 34, falling to 8% for those aged 43 to 44.

A guideline from the American Society for Reproductive Medicine reached a similar conclusion. It found there is insufficient evidence to predict live birth rates after planned egg freezing, but that outcomes appear better for women who freeze at a younger age.

The practical takeaway: the younger you are when you freeze, and the more eggs you store, the better your odds tend to be. It is a backup, not a promise.

How long can eggs be stored in the UK?

The law changed on 1 July 2022. Before then, the HFEA says most people could only store eggs for up to 10 years, unless they had a medical reason. Now, most people can store eggs, sperm or embryos for up to 55 years, as long as they renew their consent every 10 years.

That renewal step matters. The HFEA warns that if your clinic cannot reach you to renew your consent, your eggs will be removed from storage and disposed of once they can no longer lawfully be stored. If you move house, change your number or relocate abroad, update your clinic.

How much does egg freezing cost?

Costs vary between clinics and change over time, so treat any figure as a starting point. The HFEA gives averages of about £3,350 for collection and freezing, £500 to £1,500 for medication, £125 to £350 a year for storage, and about £2,500 to thaw and transfer, adding up to an average of £7,000 to £8,000 for the whole process.

Outside the UK, in Lagos, Nairobi, Accra or Johannesburg, prices and regulation differ, and HFEA rules do not apply. The same principle holds everywhere: ask for a written, fully costed plan that includes drugs, scans, storage and future thawing.

Questions to ask a clinic

• What are your results for women my age who froze eggs and later used them? Ask how many patients those figures are based on.
• How many eggs do you expect me to get, and how many would you suggest storing?
• Can I have a fully costed plan? Include drugs, monitoring, collection, freezing, yearly storage, thawing, ICSI and embryo transfer.
• What is your storage and consent renewal process? How will you contact me, and what happens if you cannot?
• What will you do to reduce my risk of OHSS?
• Do you offer any add-ons, and what is the evidence for them? The HFEA rates the evidence for common extras on its treatment add-ons page.

If you are already trying to conceive, or have been for a while, egg freezing may not be the right first step. Our post on when to see a fertility specialist explains when to ask for tests, and the fertility guide covers the bigger picture, including how age affects natural conception.

Making the decision

Egg freezing can buy you options and some peace of mind. It also involves injections, a procedure, significant costs and no guarantees. It is worth talking to a fertility specialist about your own egg reserve and circumstances before you decide, and giving yourself time to think it through without pressure from anyone else's timeline.

Knowing your cycle helps those conversations. With Asele, cycle tracking and symptom logging give you a clear record of your cycle length and any changes, and you can talk through your questions with Amara in Yoruba, Hausa, Igbo, Swahili, French or English. The Health Brief turns your logs into a short summary to bring to a fertility consultation. You can find us at Asele.

This post is education, not medical advice. If you develop severe tummy pain, breathlessness or swelling after egg collection, contact your clinic urgently or go to your nearest hospital emergency department.

References

1. Human Fertilisation and Embryology Authority. Egg freezing. hfea.gov.uk
2. Human Fertilisation and Embryology Authority. Fertility preservation. hfea.gov.uk
3. Human Fertilisation and Embryology Authority. Consent to treatment and storage. hfea.gov.uk
4. Human Fertilisation and Embryology Authority. Fertility treatment 2023: trends and figures. hfea.gov.uk
5. Human Fertilisation and Embryology Authority. Fertility treatment 2024: trends and figures. hfea.gov.uk
6. Human Fertilisation and Embryology Authority. Treatment add-ons with limited evidence. hfea.gov.uk
7. Practice Committee of the American Society for Reproductive Medicine. Evidence-based outcomes after oocyte cryopreservation for donor oocyte in vitro fertilization and planned oocyte cryopreservation: a guideline. Fertility and Sterility, 2021. pubmed.ncbi.nlm.nih.gov
8. Practice Committee of the American Society for Reproductive Medicine. Prevention of moderate and severe ovarian hyperstimulation syndrome: a guideline. pubmed.ncbi.nlm.nih.gov