Ovarian Tissue Freezing
Ovarian tissue freezing, ovarian tissue cryopreservation in the paperwork, takes the outer layer of the ovary rather than the eggs inside it. A surgeon removes a piece of that cortex by keyhole surgery, usually from one ovary, and the laboratory cuts it into thin strips and freezes them. Thousands of immature eggs sit in that tissue. None of them are collected, counted or fertilised.
This is the option for people who have no time. A stimulation cycle needs two weeks and a hormone axis that will answer the drugs. A piece of cortex can come out next week, with no injections at all, and that is the whole reason the procedure exists.
It can also give back something nothing else on this hub can. Grafted tissue starts making hormones again, so periods and ovarian function often return. It does involve two operations, and it is done at specialist centres in smaller numbers than the other options.
At a glance
- Also known as
- Ovarian tissue cryopreservation, OTC, ovarian cortex freezing
- Stages
- 2 operations, years apart
- Appointment time
- About an hour for the retrieval, and about the same again for the graft
- Anaesthesia
- General, for both operations
- Time in clinic
- Day case, occasionally one night
- Back to normal
- 3–7 days
- Whole process
- 2–3 weeks per operation; a graft takes months to start working
- Scar
- Two or three keyhole scars under a centimetre each, around the navel and low on the belly
- Typical cost
- $10,000–$18,000 (United States, self-pay)
Figures reviewed .
On this page
Who it’s for
Three groups. Girls who have not been through puberty, for whom a stimulation cycle is not possible at all, so this is the only preservation option there is. Anyone facing chemotherapy or pelvic radiotherapy that starts in days rather than weeks. And people with hormone-sensitive cancers, where driving oestrogen up to grow a batch of eggs is a risk the oncologist will not take.
Tissue is also taken ahead of testosterone, and sometimes during gender-affirming surgery that removes the ovaries, which trans and non-binary patients covers.
It is no longer classed as experimental in many countries, and several professional bodies now describe it as established practice. It happens at specialist centres, and if there is no such centre near the hospital treating you, the tissue can usually travel to one.
Some people have a better fit elsewhere. If you have two clear weeks and a normal response is expected, egg freezing gives you material somebody can count. And if the cancer is one that can spread to the ovary, the graft may not be safe to put back, which is a conversation to have before the tissue comes out.
When treatment is being planned
Ask the oncologist how many days you actually have before treatment starts, and ask on the first day you can. A fortnight and a couple of days lead to completely different options, and the fertility team can only work with the answer they are given.
How it’s done
Two operations, years apart. The first is keyhole surgery under general anaesthetic, usually an hour or less. Through two or three small cuts the surgeon lifts one ovary and shaves off a piece of the outer layer, or removes the whole ovary in a young child, and closes up. No drugs beforehand, no scan monitoring, no waiting for a cycle to start.
The tissue reaches the laboratory the same day. It is cut into strips about a millimetre thick, checked under a microscope, and frozen slowly rather than vitrified, which is the opposite of how eggs are handled. Most centres send a fragment for testing to see whether cancer cells are present in it.
The second operation puts it back. Strips are thawed and grafted, usually onto the remaining ovary or into a pocket made in the pelvic wall, again by keyhole surgery. The graft arrives with no blood supply of its own and has to grow one, which takes months. Hormone levels are then watched for the first sign that it has taken.
Before the retrieval
Ask whether a fragment will be screened for cancer cells, and who will be holding that result afterwards. It decides whether the tissue can go back, and it is much easier to have in your own notes from the start.
After ovarian tissue freezing
Two recoveries, and both are the ordinary recovery of keyhole pelvic surgery. Sore for a few days, shoulder-tip pain from the gas used to inflate the abdomen, tired for a week or two. Most adults are back at a desk inside a week.
For the people who need this most the recovery matters less than the calendar. Chemotherapy often starts within days of the retrieval, and oncologists rarely want more than a short gap, which is exactly why the procedure gets chosen. The team plans the operation around the treatment date, not the other way round.
The second operation is the same surgery again without the deadline. What follows it is a wait rather than a convalescence. Periods coming back, or a hormone level climbing, is the sign the graft is working, and that usually takes three to six months.
| Referral to surgery | Often days. No drugs, no monitoring, so the retrieval can be booked into the first free slot. |
|---|---|
| Retrieval day | Keyhole surgery under general anaesthetic, home the same day for most. The lab freezes the tissue in strips. |
| Days 1–7 | Cramping, shoulder-tip pain and fatigue. Cancer treatment often starts in this window. |
| Weeks 2–3 | Incisions healed, normal activity back. Storage fees start. |
| Years later | Screening results reviewed, then a second keyhole operation to graft the thawed strips back. |
| Months 3–6 after the graft | Hormone levels rise and periods often return. Trying to conceive, naturally or with IVF, starts from here. |
| A few years on | The graft's function fades. Any remaining frozen strips can be grafted in turn. |
In the months after the graft
Keep a note of when your periods come back and how they behave. The graft announces itself through your cycle long before a scan shows much, and that record is the first thing the team will ask you for.
Ovarian tissue freezing scars
Two or three keyhole scars, each under a centimetre, around the navel and low on the belly. The second operation usually goes back through the same ones. In children the retrieval is often done under an anaesthetic they were already having for something else, which can save a separate set entirely.
Risks and complications
The retrieval is routine keyhole surgery, so its risks are the usual ones. Bleeding, infection, injury to bowel or bladder, and the risks of a general anaesthetic in somebody who may already be unwell. Taking cortex also removes some eggs, which is worth weighing if the treatment ahead is likely to spare the ovaries.
The risk that belongs to this procedure alone is putting cancer back with the graft. Tissue removed before treatment can carry malignant cells, and grafting it can reintroduce the disease. The concern is greatest in leukaemia, and centres screen the tissue and will decline to graft it where that risk is real. So whether tissue can go back in is decided case by case.
It also helps to know that a graft works for a limited time, commonly a few years. Freezing several strips rather than one is standard for that reason, so more can be grafted later.
Ovarian tissue freezing results
Live births after grafted ovarian tissue are real, and the reported total has grown steadily, though it sits in the low hundreds worldwide rather than the thousands. The published series are small and come mostly from a handful of centres. The most useful figure is the centre's own count of grafts and births.
What the tissue does reliably is restore hormone function. Most grafts start working within months and bring periods back, along with the bone and cardiovascular protection that would otherwise need replacement therapy. That is worth a great deal to somebody who would otherwise be postmenopausal at twenty-five.
Pregnancies happen naturally after a working graft as well as through IVF. What you are planning around is a window of a few years, so it pays to plan with the team when to graft.
Alternatives to ovarian tissue freezing
Where there are two clear weeks to spare, egg freezing is the usual choice. It gives you counted material in a tank from a single procedure. Where there is also sperm you are ready to commit to, frozen embryos tell you more again. For a child, or somebody whose oncologist wants treatment started on Monday, tissue freezing is the option that fits.
Where the ovaries have already gone, or the tissue cannot be grafted safely, donor eggs offer an excellent route to a pregnancy, and it helps to know that option is there from the start.
Egg Freezing
A stimulation cycle that ends with eggs collected under sedation and frozen unfertilised, to be thawed and fertilised years later. Identical to the first half of IVF. Age at freezing sets the odds; the eggs do not age in storage.
Best for: anyone who wants children later, has no sperm source they want to commit to now, and would rather freeze at this age than at the next one
Egg Donation
IVF in which the eggs come from a donor and are fertilised with your partner's or a donor's sperm, then transferred to you. You take no stimulation drugs and have no egg collection, only lining preparation and a transfer.
Best for: anyone with no usable eggs left, or whose own eggs have not made a viable embryo over several cycles
Combining ovarian tissue freezing with other treatment
The retrieval is often bolted onto something else. In children it goes alongside an anaesthetic they were already having. In adults it is sometimes done at the same time as line insertion before chemotherapy, or during surgery that was happening anyway. Ask whether that is possible, because it saves an anaesthetic and a day.
Where there is any window at all, some centres collect a few mature eggs as well as taking tissue. The two are not mutually exclusive.
Ovarian tissue freezing cost
Prices here are harder to pin down than for egg freezing, because few centres do enough of it to keep a price list. Expect the retrieval, the laboratory processing and annual storage to be quoted separately, and expect the graft operation years later to be priced on its own. Ask what a re-implantation costs at today's figures before you agree to anything.
Funding is the better news. Because this is almost always done for medical reasons ahead of cancer treatment, public systems and insurers cover it far more often than they cover elective freezing. In several countries it sits inside the oncology pathway rather than arriving as a fertility bill. Ask the oncology team who is paying, not only the fertility clinic.
| Country | Self-pay | Public / insurance |
|---|---|---|
| United States Retrieval and lab processing; storage roughly $500–$1,000 a year; the graft operation is a separate fee later | $10,000–$18,000 | Often covered when it is part of cancer care; rarely for elective preservation |
| United Kingdom Storage roughly £300–£500 a year; re-implantation charged separately | £4,000–£8,000 | NHS funded in most cancer pathways at the specialist centres that offer it |
| Europe Some centres accept tissue referred from other hospitals, with transport arranged lab to lab | €5,000–€10,000 | Inside cancer care in several national systems; Denmark and Belgium run the longest-established programmes |
Choosing a clinic for ovarian tissue freezing
Experience is the key question, and the numbers are small enough here that you can ask about them directly. I would ask how many retrievals the centre has done, how many grafts it has put back, and how many of those grafts went on to work. The third number shows a centre that has seen the whole journey through, which is the experience you want.
Then the practical things. Whether the freezing and the grafting happen in the same laboratory, and how the tissue is screened for cancer cells. Ask what happens if you move country. And ask, with the oncology team in the room, how long the retrieval will hold up your treatment, because that answer should be counted in days.
At the consultation
Ask who decides whether your tissue is safe to graft, and when that decision gets made. Knowing who makes that call, and when, helps you plan with confidence from the first operation.
Frequently asked questions
Is ovarian tissue freezing still experimental?
Not in most current guidelines, which describe it as established rather than experimental. It is still a specialist-centre procedure done in small numbers. See who it's for.
Can the tissue ever be unsafe to put back?
Yes. In some cancers, leukaemia above all, the tissue can carry malignant cells and grafting it could reintroduce the disease. See risks.
How long does a graft keep working?
A limited time, commonly a few years, and then it fades. Freezing several strips is the usual way round that. See results.
Does it work for a girl who has not started her periods?
It is the only preservation option she has, because a stimulation cycle needs a hormone axis that is not running yet. The retrieval is often done under an anaesthetic she is already having.
Will I need IVF afterwards?
Not always. Pregnancies happen naturally once a graft is working, and IVF is used when they do not. See results.