Who freezes eggs, and why
People freeze eggs for two broad reasons, and the HFEA, the UK fertility regulator, describes both (HFEA, accessed 2026).
- Medical fertility preservation. Some treatments and conditions can damage fertility, cancer treatment being the best-known example. The HFEA also lists trans people before hormone therapy or surgery, and people facing a risk of injury or death, such as armed forces deployment.
- Elective (sometimes called social) freezing. This is for people who are concerned about fertility falling with age but are not ready for a child, or do not yet have a partner they want to have one with.
The process is similar either way. What differs is the timeline. Medical preservation often has to fit into a short window before treatment starts. Elective freezing can be planned around work, travel and finances.
The process, step by step
Assessment
A consultation, blood tests and an ultrasound give the clinic a sense of how many eggs you are likely to produce. The antral follicle count from the scan and your AMH level are the usual starting points. They predict quantity, not quality.
Stimulation
Hormone medication encourages several eggs to mature at once. The HFEA describes this phase as similar to IVF, lasting roughly two to three weeks, with scans and sometimes blood tests to track progress.
Egg collection
Eggs are collected with a fine needle guided by ultrasound, under sedation or general anaesthetic. Our guide to anaesthesia during egg retrieval explains what you are likely to feel and how recovery goes.
Freezing
The lab adds a protective solution and freezes the eggs, either slowly or by vitrification (very fast freezing), then stores them in liquid nitrogen. The HFEA notes that vitrification shows higher success in the latest statistics.
Storage
Eggs stay frozen until you use them, donate them, or stop storage. Every year in between involves fees and, depending on the country, consent paperwork.
How many eggs to expect
According to the HFEA, most patients under 38 have about 7 to 14 eggs collected in a cycle, though that may not be possible for people with low ovarian reserve. Not every egg collected will be mature, and clinics usually report maturity alongside the total. After your collection, ask how many eggs were mature and how many were frozen. Those are often different numbers. Our explainer on mature versus immature eggs shows how to read a maturity report.
Some people need more than one collection to bank the number of eggs they are hoping for. Whether that makes sense depends on age, response and budget. We look at the maths in our article on egg banking across multiple retrievals.
Why age at freezing matters most
Eggs keep the age they were frozen at. The HFEA notes that eggs frozen when you are younger are of the highest quality, though it does not name a single "best" age. Freezing at 32 and using the eggs at 40 is biologically different from freezing at 40.
A second point is easy to miss. Published success data for frozen eggs are still limited. The HFEA says the number of treatments using a patient's own frozen eggs is low, so it suggests looking at fresh IVF success rates for your age band as a rough guide. Treat any single "chance of a baby per frozen egg" figure with care, and ask what data it comes from.
No guarantee
Frozen eggs are an option for later, not a promise. Some will not survive thawing, some will not fertilise, and some embryos will not develop or implant. A plan that relies on frozen eggs should include a conversation about what happens if they do not work.
The storage commitment
Freezing is not a one-off purchase. It starts a long relationship with a clinic or storage bank.
Time limits and consent
Rules vary by country. In the UK, since 1 July 2022, eggs can be stored for up to 55 years from when they were first frozen, but consent has to be renewed every 10 years. If consent is not renewed, or the clinic cannot reach you, the eggs are removed from storage and disposed of (HFEA, accessed 2026). Before that date, UK storage was usually limited to 10 years, with exceptions for medical reasons.
If you freeze in another country, ask that clinic for its storage limit in writing, what renewal involves, and what happens if you move or change your contact details. The consent forms you sign at the start govern most of this. Our plain-language guide to IVF consent forms covers the storage and disposition sections in detail.
The HFEA also notes that there is not yet enough evidence to say whether very long storage affects how viable eggs are.
What it costs in the UK
The HFEA publishes these average UK figures, in pounds sterling. Prices elsewhere, including in Latin America, differ, and clinics bundle items differently, so use them only to understand which parts of the bill to ask about.
| Item | HFEA UK figure (GBP) |
|---|---|
| Egg collection and freezing | Average £3,350 |
| Medication | £500 to £1,500 |
| Storage | £125 to £350 per year |
| Thawing, fertilisation and transfer | Average £2,500 |
| Freezing plus later thawing, overall | Average £7,000 to £8,000 |
Notice that the thaw-and-transfer stage is a separate cost that comes years later. It is easy to budget for the freezing and forget the using.
Using your eggs later
When you decide to use them, the eggs are thawed. The HFEA explains that only the eggs that survive intact are fertilised, and that this is done by ICSI, where a single sperm is injected into each egg. Any embryos that develop are cultured in the lab, and one is transferred to the uterus, with others frozen if suitable.
If your eggs are stored in one country and you later want treatment in another, moving them means a specialist shipment, paperwork at both ends, and the receiving clinic's agreement. It is far simpler to think about this before you freeze than after.
Risks to understand
The HFEA describes IVF-style stimulation as mostly very safe, with medication side effects that are usually mild. The main medical risk is ovarian hyperstimulation syndrome (OHSS), an over-response to medication that is usually mild but can rarely be serious. ReproductiveFacts (ASRM, 2023) notes that high AMH and PCOS raise the risk, while low ovarian reserve does not.
The biggest risk, though, is not medical. It is that the eggs do not lead to a pregnancy when you need them. And if they do, the HFEA points out that pregnancy complications rise with the age of the person carrying it, whatever the age of the egg.
Questions to ask before you freeze
- Based on my tests, roughly how many eggs might I get in one cycle, and would you suggest more than one?
- Do you freeze by vitrification? How many of my eggs are likely to be mature?
- What is your storage limit, how often must I renew consent, and how will you contact me?
- What are the yearly storage fees, and can they rise?
- What will thawing, ICSI and transfer cost when I come back?
- What happens to my eggs if I move abroad, stop paying, or die?
- Can I move them to another clinic or country later, and what does that involve?
The Takeaway
Egg freezing gives you a stored option, not a guarantee. Judge it on your age at freezing, the number of mature eggs actually banked, and a clear understanding of the storage rules and costs that follow.
Frequently asked questions
Is egg freezing the same as embryo freezing?
No. Egg freezing stores unfertilised eggs, so no sperm source is needed at the time. Embryo freezing stores eggs that have already been fertilised, which means a sperm source is needed at the start, and a partner who provides sperm normally has to consent too.
How long can frozen eggs be stored?
It depends on where they are stored. In the UK, the limit has been up to 55 years since July 2022, with consent renewed every 10 years, according to the HFEA. Other countries set their own rules, so ask your clinic.
How are frozen eggs fertilised later?
The HFEA explains that thawed eggs that survive intact are fertilised by ICSI, with one sperm injected into each egg, rather than by mixing eggs and sperm in a dish.
Is egg freezing painful?
Experiences of the daily injections vary, and the HFEA describes medication side effects as usually mild. The HFEA notes that collection itself is done under sedation or general anaesthetic. Ask your clinic what pain relief and aftercare it recommends for the day of collection.
Can I freeze eggs abroad and store them there?
Yes, many people do. Before you start, find out the clinic's storage limits, renewal process and fees in writing, and whether it will help ship the eggs if you later want treatment elsewhere.