Fertility preservation means freezing eggs, sperm or embryos — or storing ovarian tissue for later transplant — so that a cancer diagnosis, an ovarian surgery or simply the passage of years does not close the door on having a child. The methods most patients are offered are established, not experimental: a 2026 review of 25 years of the field confirms oocyte vitrification shed its “experimental” label years ago, and the American Society for Reproductive Medicine publishes standing guidance on who should be offered it.
Two numbers frame every decision below: egg freezing before age 35 with 15–20 or more mature eggs banked is associated with a cumulative live-birth rate above 75%, and one US stimulation cycle costs $11,000–$17,000 plus $200–$1,000 a year in storage.
This guide is written by the ProIVF Medical Editorial Team from peer-reviewed evidence — the ASRM 2026 practice guidance, a 2025 Cochrane review of 23 randomised trials, the POSITIVE trial in 518 young breast cancer patients, and registry cohorts covering 1,357 men and 5,940 women — and reviewed by the ProIVF Medical Advisory Board. ProIVF sells no treatment and takes no clinic commission.
Who actually needs fertility preservation?
Cancer used to define this conversation. In 2026 the ASRM Practice Committee republished its guidance as patients with medical indications, covering any treatment or condition capable of damaging the ovaries, testes or uterus.
| Situation | Why fertility is at risk | Options discussed |
|---|---|---|
| Chemotherapy or pelvic radiotherapy | Drugs and radiation destroy follicles and sperm-producing cells | Egg, embryo or sperm freezing; ovarian tissue; GnRH agonist |
| Repeat ovarian surgery for endometriosis | Each operation removes healthy tissue and lowers AMH | Egg or embryo freezing before surgery |
| Turner syndrome, early-menopause family history, low reserve | Reserve falls years before symptoms appear | Egg freezing; early donor-egg planning |
| Testicular cancer, leukaemia, lymphoma | Sperm output often already impaired before treatment | Sperm freezing, often more than one sample |
| Sex-affirming care | Hormones and surgery can end gamete production | Sperm, egg or embryo freezing first |
| Childbearing planned for later | Egg quality declines fastest after 35 | Planned (“elective”) egg freezing |
Every row carries a different clock, and the clock — not the diagnosis label — decides what is realistic. Non-cancer referrals now make up a large share of preservation clinics, and the American College of Obstetricians and Gynecologists treats infertility itself as a medical condition. See the step-by-step IVF process guide and, for endometriosis, the endometriosis and IVF guide.
Why the breast cancer numbers change the conversation
Danish registry researchers compared 5,940 women diagnosed with breast cancer between ages 18 and 40 with 1,126,478 matched controls and found their rate of subsequent live birth was 62% lower (adjusted HR 0.38, 95% CI 0.35–0.41).
| Subgroup | Live-birth HR vs matched controls |
|---|---|
| All diagnosed at age 18–40 | 0.38 (0.35–0.41) |
| Diagnosed at 18–24 | 0.66 |
| Diagnosed at 35–40 | 0.34 |
| No children before diagnosis | 0.51 |
| Already a mother before diagnosis | 0.31 |
| Cancer in lymph nodes | 0.30 |
| Cancer spread to distant organs | 0.18 |
Stage and prior pregnancies moved the odds as much as age did.
The other half of the picture is survival: Denmark reported 92.2% five-year survival for people diagnosed under 50 in 2022, so for most patients the question is not whether they live but whether the option of a child survives with them.
Does everyone referred actually bank anything?
Far fewer than you would expect. In a Karolinska cohort of 1,378 adolescent and young adult men who banked semen between 1988 and 2020, 493 of 1,357 eligible men later became fathers — 399 (81%) naturally, 87 (18%) through assisted reproduction, and only 92 using their own cryopreserved sperm.
That is not a reason to skip banking. In a series of 545 men treated at one oncofertility programme, 48% of testicular cancer patients were already oligozoospermic — low sperm count — at diagnosis, so for those men the banked sample is the only usable one they will have. Our male infertility and IVF guide covers the rest.
Which method fits which situation?
Egg and embryo freezing need 10–14 days of ovarian stimulation; sperm freezing needs one sample and no delay at all. Ovarian tissue is the only option that works without stimulation, and the only one available before puberty.
| Method | Who it suits | Time needed | Status in 2026 |
|---|---|---|---|
| Egg freezing | Women with a few weeks; no partner required | 5–14 days, random-start | Established |
| Embryo freezing | Women with a partner or donor sperm, and time for IVF | 2–3 weeks | Established; highest yield per unit |
| Sperm freezing | Any post-pubertal male patient | Same day | Established; least invasive |
| Ovarian tissue | Pre-pubertal girls; women with no time to stimulate | Day surgery, no real delay | No longer experimental, still specialised |
| GnRH agonist co-treatment | Women starting chemotherapy immediately | No extra days | Add-on, not a substitute |
| Donor eggs or carrier | When ovaries or uterus are already damaged | Varies | Alternative pathway, not preservation |
What ovarian tissue freezing can and cannot do
A 2024 systematic review of 58 studies counted 122 women who had frozen ovarian tissue reimplanted, producing 162 deliveries — 154 singletons and 8 twins — and 170 newborns. Some 83.6% had a malignant disease and 51.0% had already had chemotherapy before tissue was frozen, which is why the technique matters: it is often the only route left once treatment has started.
Two findings deserve attention. Preterm birth occurred in 9.4% of deliveries and hypertensive disorders in 18.9% (pre-eclampsia 9.4%, pregnancy-induced hypertension 7.6%, HELLP 1.9%), with gestational diabetes and preterm prelabour rupture of membranes at 3.8% each; the authors found complication rates no higher than the general pregnant population, preeclampsia excepted. Freezing before chemotherapy (OR 0.23, 95% CI 0.07–0.72) and natural conception rather than ART (OR 0.29, 95% CI 0.09–0.92) both carried fewer complications.
Does fertility preservation delay cancer treatment?
Only by days to weeks, and the delay is now measured rather than feared: freezing added a median of 9–33 days before gonadotoxic treatment in the largest matched analysis.
“FP delayed gonadotoxic cancer treatment by up to 4.5 weeks, a delay that would not be expected to alter prognosis for many women.” — Meernik et al., Cancer, 2023
That conclusion is why referral for preservation can be argued without asking an oncologist to compromise survival. The same study found women starting assisted reproduction before treatment were likelier to reach a live birth once pregnant (age-adjusted RR 1.47, 95% CI 0.98–2.23), though gestational carriers featured in 47% of transfer cycles before treatment versus 20% after.
What does random-start stimulation cost you?
It costs a little more drug and a few more days, and nothing in yield. A meta-analysis of 11 studies comparing 688 random-start with 1,076 conventional stimulation cycles found no meaningful difference in eggs retrieved, mature eggs or embryos created.
Stimulation was slightly longer (SMD 0.35, 95% CI 0.09–0.61) and the gonadotrophin dose slightly higher (SMD 0.23, 95% CI 0.06–0.40), both with P = 0.009.
Random-start means the clinic begins stimulation on the day you present rather than waiting up to three weeks for your next period. For a patient whose chemotherapy is scheduled, it is usually the difference between having time and not.
Which delays are never acceptable?
Some situations cannot wait two weeks, and in those the answer is not egg freezing. They include:
- Acute leukaemias and aggressive lymphomas, treated within days.
- Symptomatic or rapidly progressing disease, where oncology will not pause.
- Borderline ovarian tumours or hormone-sensitive cancers, where delay itself is a risk.
- Adolescents before puberty, where ovarian tissue is the only option.
Is stimulation safe, and does it raise cancer risk?
For breast cancer the direct evidence is the POSITIVE trial, in which 518 young women temporarily interrupted endocrine therapy to attempt pregnancy. Among them, 273 (53%) had already lost their periods; 94% of those resumed menstruation within 12 months of stopping treatment.
| POSITIVE trial outcome | Result |
|---|---|
| At least one pregnancy | 368 of 497 (74%) |
| 1-year cumulative pregnancy, frozen before 35 | 63.5% |
| Aged 35–39 | 54.3% |
| Aged 40–42 | 37.7% |
| Had banked embryos or eggs | 179 (36%), of whom 68 transferred |
| Higher pregnancy odds, frozen embryo transfer only | OR 2.41 (95% CI 1.75–4.95) |
| 3-year breast-cancer-free-interval events, with stimulation | 9.7% (6.0–15.4) |
| Same measure, no stimulation | 8.7% (6.0–12.5) |
The intervals overlap and the trial was designed for feasibility rather than superiority, so the honest summary is that stimulation did not look harmful in these women — and was not proven safe over decades either.
Does a GnRH agonist shot protect the ovaries?
It lowers the chance of ovarian failure; it has not been shown to give you more babies. The 2025 Cochrane review of 23 randomised trials in 2,647 women found GnRH agonist co-treatment reduced ovarian insufficiency (RR 0.43, 95% CI 0.31–0.59, based on 5 studies and 811 women, with no statistical heterogeneity).
Live birth was reported in only 3 studies of 599 women, with a pooled RR of 1.60 and a confidence interval wide enough to include harm (0.89–2.87).
Adding letrozole or tamoxifen to stimulation did not measurably improve egg numbers, on very low-certainty evidence. The 2026 review of the field’s first 25 years is blunt: GnRH analogues may reduce premature ovarian insufficiency in some populations, but no improvement in live birth has been demonstrated. Treat the injection as a second-line shield for when there is no time to freeze anything.
What does fertility preservation cost, and who pays?
A first egg-freezing cycle ranges from about $4,500 in Malaysia to $17,000 in the United States, and storage fees recur annually whether or not the eggs are used.
| Country | Cycle + medication | Fertilisation/ICSI when used | Annual storage | First-year total |
|---|---|---|---|---|
| United States | $8,000–$12,000 | $3,000–$5,000 | $500–$1,000 | $11,000–$17,000 |
| Thailand | $3,500–$6,000 | $2,000–$3,500 | $300–$500 | $5,500–$9,500 |
| Malaysia | $3,000–$5,000 | $1,500–$3,000 | $200–$400 | $4,500–$8,000 |
| Japan | $4,000–$7,000 | $2,000–$4,000 | $300–$600 | $6,000–$11,000 |
Budget a further $4,000–$8,000 for the day you use them: thawing, ICSI, culture and transfer are billed separately. Line items by country are in our IVF cost guide, and the five steps in the egg freezing guide.
Sperm freezing is an order of magnitude cheaper: a few hundred dollars to process and freeze a sample, plus a few hundred a year in storage. Ovarian tissue cryopreservation is the costliest and least standardised option, needing laparoscopic day surgery, a histology laboratory and a long-term cryostorage contract.
Does insurance cover it?
For medical indications, more often than for age-related ones. Preservation is mandated in some form by roughly 21 US states plus the District of Columbia, but several of those laws cover only iatrogenic — treatment-caused — infertility, not elective egg freezing.
In the United Kingdom, NHS funding for preservation on medical grounds exists where an oncology or fertility centre supports the referral, with storage rules set by the Human Fertilisation and Embryology Authority. Either way, ask for a written estimate separating retrieval, medication, freezing and year-one storage.
What are the real success rates?
Frozen does not mean guaranteed, and the honest numbers depend entirely on what was frozen, at what age, and in what quantity.
| What was banked | What the evidence shows |
|---|---|
| 15–20+ mature eggs frozen before 35 | Cumulative live birth above 75% in two large centres (Cobo et al., RBM Online 2025) |
| Embryos used via frozen transfer (POSITIVE) | The only route linked to higher pregnancy odds (OR 2.41, 95% CI 1.75–4.95) |
| Reimplanted ovarian tissue | 162 deliveries from 122 women across 58 studies; 108 (66.7%) conceived naturally |
| Banked sperm in young men | 493 of 1,357 eligible men became fathers; 92 used the sample |
| GnRH agonist alone | Less ovarian insufficiency (RR 0.43); live birth inconclusive (RR 1.60, 0.89–2.87) |
The largest caveat is also the least discussed: the 2025 planned-oocyte-cryopreservation authors state directly that the technology “does not guarantee live birth”, and outcomes depend on age at freezing and total egg number. Age still matters at the point of use — see IVF success rate by age, pregnancy after 35 and own eggs versus donor eggs. On duration, biology and law set different limits: vitrified eggs show no meaningful expiry, but legal storage periods do lapse.
Three Patients, Three Different Timelines
Three positions on the map above: eleven days before chemotherapy, one afternoon before radiotherapy, and two years before a second surgery.
The following patient stories are shared with consent. Names and identifying details have been changed to protect privacy.
Case 1: Mei, 31 — eleven days before chemotherapy (Guangzhou)
Mei was diagnosed with stage IIB breast cancer and started her first cycle in 19 days. A random-start stimulation and freeze cost about ¥48,000, with ¥2,800 a year in storage, and produced 14 mature eggs from one retrieval.
Her difficulty was administrative, not medical: three departments had to sign off before her oncologist would confirm the date, and she signed the consent forms on the afternoon she started injections. “I froze the eggs the day before admission for chemo, and nobody in my family understood why I spent a month’s salary on something I might never use,” she said.
Treatment ended 14 months later. At 33 she used four of her frozen eggs to create two embryos, and one transfer resulted in a daughter born at 38 weeks. “Insurance paid nothing. My oncologist said eleven days would not have changed my prognosis, and he was right.”
Case 2: Kai, 26 — one afternoon before radiotherapy (Melbourne)
Kai had early-stage Hodgkin lymphoma. He banked two sperm samples on consecutive days before any treatment for AU$450 plus AU$280 a year in storage.
His difficulty was fertility itself: the first sample came in below the reference range, and the clinic advised a second collection nine days later rather than accepting one. “They told me the sperm count I had on diagnosis day was already the best it might ever be,” he said.
Chemotherapy left him azoospermic for 18 months. At 30 his partner conceived with the banked sample through IUI, and their son was born at 39 weeks. “AU$450 was the least expensive thing in the entire illness, and the only one that mattered afterwards.”
Case 3: Lin, 37 — two years before a second surgery (Los Angeles)
Lin had deep endometriosis and one prior cystectomy, with an AMH of 0.54 ng/ml before her second operation. Two retrievals produced 11 mature eggs at a cost of roughly $14,200 out of pocket, because her insurer classified the indication as age-related rather than iatrogenic.
Her difficulty was paperwork, not the procedure. “I had a surgeon’s letter, a pathology report and an AMH result, and it was still denied in writing as elective,” she said.
She did not use them immediately. At 39 she transferred one frozen embryo without conceiving, then transferred a second; her daughter was born at 37 weeks. “Two retrievals was the right call. With an egg number like mine, eleven was not a luxury.”
FAQ
Q: How many eggs should I freeze?
Aim for 15–20 or more mature eggs if your age and reserve allow: cumulative live-birth rates above 75% were reported in that band for women who froze before 35.
Q: Can I freeze my eggs at 40?
You can, but plan around yield: at 40, mature eggs per retrieval average single digits, so clinics counsel multiple cycles or a parallel donor-egg plan (donor-egg IVF guide).
Q: Does fertility preservation hurt?
Most discomfort comes from 10–14 days of abdominal injections and bloating as follicles grow; retrieval happens under sedation, and sperm collection is not a procedure at all. See IVF side effects.
Q: Will freezing eggs reduce my natural fertility later?
No. Stimulation rescues follicles that would have been lost that cycle anyway rather than depleting future reserve — and in POSITIVE, 368 of 497 women (74%) still achieved at least one pregnancy.
Q: Does insurance pay for fertility preservation?
In the US it depends on your state and on whether your indication is iatrogenic or age-related: roughly 21 states plus DC mandate some preservation coverage, while many plans still exclude elective freezing.
Planning Your Next Step
Fertility preservation is a race against a calendar you did not choose, and the options sort themselves by days available: same-day for sperm, about two weeks for eggs or embryos, and any window at all for ovarian tissue in a specialist centre. Ask three questions at the first appointment — how long with a random-start protocol, what the all-in written cost is including year-one storage, and what my prognosis looks like if treatment waits three weeks.
To compare clinics, filter our reproductive centre directory by fertility preservation services and country, or contact our team for a shortlist built around your treatment date. Timelines and drug protocols in this field change quickly, and none of this replaces your oncology and reproductive teams’ advice.
Written by the ProIVF Medical Editorial Team and reviewed by the ProIVF Medical Advisory Board. Evidence base: ASRM Practice and Ethics Committee guidance on fertility preservation for medical indications (Fertility & Sterility, 2026), a Cochrane Database of Systematic Reviews 2025 review, and randomised or cohort studies indexed in PubMed in Cancer, Journal of Clinical Oncology, Human Reproduction, American Journal of Obstetrics and Gynecology, Reproductive BioMedicine Online, Frontiers in Endocrinology and Human Reproduction Update, plus ACOG patient guidance and UK HFEA regulation. ProIVF has no commercial relationship with any clinic, laboratory or brand named here.
Last updated: 26 September 2026. This article is educational content and is not a substitute for individualised medical advice. Always follow the specific guidance of your treating oncology and fertility teams.
