Embryo cryopreservation in Turkey: what it is and how it works
Embryo cryopreservation means freezing embryos created during IVF or ICSI so that they can be stored and transferred in a later cycle. Today the standard method is vitrification, a flash-freezing technique. The embryo is briefly placed in solutions that replace most of its water with protective agents, then plunged into liquid nitrogen at about minus 196 degrees Celsius. This turns the embryo into a glass-like solid without damaging ice crystals, and it stays unchanged until it is warmed. Turkish IVF laboratories freeze embryos on day 3 or, more often, at the blastocyst stage on day 5 or 6.
This guide explains how freezing works, when it is advised, what the evidence says about frozen against fresh transfer, what it costs compared with the UK, US and Germany, how long embryos can be stored and what to ask the laboratory. It sits alongside our overview of IVF treatments in Turkey.
Why are embryos frozen? Common reasons for embryo cryopreservation
Freezing is not an extra for its own sake; it solves specific problems in an IVF cycle.
- Spare embryos. A stimulated cycle often produces more good embryos than can be transferred safely at once, so the rest are frozen for later attempts or a second child.
- Freeze-all cycles. If hormone levels are very high or there is a risk of ovarian hyperstimulation syndrome (OHSS), all embryos are frozen and transferred in a later, calmer cycle.
- Genetic testing. When embryos are biopsied for preimplantation genetic testing, they are frozen while the result is awaited.
- Endometrium not ready. A thin lining, a polyp or unexpected bleeding can delay transfer.
- Fertility preservation. Couples facing cancer treatment or surgery may freeze embryos beforehand.
- Travel planning. Some couples do stimulation and egg collection in one trip and return for a frozen transfer later, which shortens the second stay.
How are embryos frozen and thawed, step by step?
Freezing happens in the laboratory after egg collection and fertilisation, and you are not present. An embryologist grades each embryo on its development and shape, chooses those suitable for freezing and loads them onto a labelled carrier. The embryos are dipped in equilibration and vitrification solutions for a few minutes in total and cooled in liquid nitrogen. The carrier is sealed and stored in a nitrogen tank with an identification code. When you are ready for a transfer, the embryo is warmed in a set of solutions of decreasing concentration, checked for survival and, if intact, transferred within hours. The only medical step for you is preparing the womb for transfer; the freezing itself needs no procedure or recovery.
Does embryo cryopreservation work? What the evidence says
Yes. Vitrification is well established, and in good laboratories the large majority of vitrified blastocysts survive warming. Babies born from frozen embryos have been followed for decades and professional bodies such as the UK Human Fertilisation and Embryology Authority (HFEA) report no major difference in overall outcomes. Frozen embryo transfer in a prepared cycle can give pregnancy rates similar to a fresh transfer, and in some groups, such as women at risk of OHSS or with high progesterone, a freeze-all approach is safer. The evidence does not support freezing everything for everyone; a fresh transfer remains reasonable when conditions are good. Some studies suggest slightly different obstetric risks after frozen transfer, such as a higher birth weight, and these are being researched. A hospital should explain the reasons for its recommendation and should not promise a pregnancy.
Embryo cryopreservation cost in Turkey compared with the UK, US and Germany
The ranges below are approximate for the freezing step and the first year of storage, not hospital quotes. Prices vary with the number of embryos, the stage frozen, the type of carrier, the storage period and whether the freeze is part of a full IVF package.
| Country | Freezing (approx.) | Storage per year (approx.) |
|---|---|---|
| Turkey | €300 – €900 | €100 – €400 |
| United Kingdom | €500 – €1,300 | €250 – €500 |
| United States | €1,000 – €3,000 | €500 – €1,200 |
| Germany | €400 – €1,100 | €150 – €500 |
Ask whether freezing is already inside your IVF package, how many embryos the fee covers, what the storage fee is after the first year and what the later thaw and transfer costs. The warming and transfer are priced separately in most hospitals; see our guide to embryo transfer.
Embryo, egg or sperm freezing: which one are you considering?
The three freezing options solve different problems, and they are often confused. Embryos need a partner or donor sperm at the time of freezing; eggs and sperm are frozen on their own and combined later.
| What is frozen | Suited to | Typical limits |
|---|---|---|
| Embryos | Couples in IVF, freeze-all cycles, genetic testing | Both partners' genetic material is fixed; legal rules apply to storage and use |
| Eggs | Women without a partner or before treatment | Fewer eggs survive and fertilise than fresh; see your doctor for the numbers |
| Sperm | Men before cancer treatment, vasectomy or travel | Needs a good sample; see sperm cryopreservation |
How long can embryos be stored, and what are the rules in Turkey?
Embryos can in principle stay frozen for many years without ageing, and there is no known biological limit. The legal limits are what matter. In the UK the standard storage period is ten years, extendable up to 55 years under specific conditions. In Turkey, fertility treatment follows the Ministry of Health regulation, which in general limits treatment to married couples, restricts how long frozen embryos may be kept unless renewed with both partners' consent, and does not allow embryo donation. Because rules change, ask the hospital to confirm the current storage period, the consent forms and what happens if you separate or do not renew. Moving frozen embryos to another country is possible, but requires paperwork and a specialised courier.
Who benefits from embryo cryopreservation, and who does not need it?
People who benefit most are those with spare good-quality embryos, a risk of OHSS, planned genetic testing, or a wish to separate stimulation from transfer. Women with polycystic ovary syndrome often benefit from a freeze-all approach. It is less relevant if only one embryo is created and transferred fresh, or if you prefer not to create embryos you might not use for personal or religious reasons. Your doctor will review your stimulation response and decide on ovarian stimulation and the number of embryos to create with that in mind.
Your trip to Turkey and what happens after freezing
If freezing is part of a standard IVF cycle, you stay about 10 to 14 days for stimulation, egg collection and (for fresh cycles) transfer. In a freeze-all cycle the transfer happens later, so you either return in four to eight weeks for a frozen transfer, or arrange your preparation at home with the hospital's protocol. There is no recovery from freezing itself; any rest relates to egg collection, which usually requires a day of light activity. Keep the storage agreement, embryo count and grades in writing and ask how you will be informed of the tank location and the annual renewal.
Risks and limitations of embryo cryopreservation
Freezing does not damage most embryos, but a small share do not survive warming, and an embryo that survives is not guaranteed to implant. Other limits are the cost of storage, the legal limit on duration and the emotional weight of decisions about unused embryos. Laboratory failures such as tank faults are extremely rare in accredited units, which use alarms, backup storage and temperature monitoring. Associated treatment steps carry their own risks: OHSS with stimulation, and the general risks of egg collection and transfer. Independent information is available from the HFEA, the European Society of Human Reproduction and Embryology (ESHRE) and the American Society for Reproductive Medicine (ASRM).
How to choose an IVF laboratory, and questions to ask
Ask about the laboratory's vitrification experience, its survival rate after warming for patients of your age, whether embryos are labelled with two identifiers and whether backup storage and alarms are in place. Check that the hospital is licensed for assisted reproduction, that the embryologist is named, and that you receive a written consent and storage contract. Red flags are promises of guaranteed pregnancy, unclear storage fees, no written consent forms and pressure to freeze more embryos than you want. Read how our process works and request a plan on our free quote page. Questions to ask:
- Do you freeze at day 3, day 5 or both?
- What share of your frozen blastocysts survive warming?
- How long may my embryos be stored, and what is the annual fee?
- What happens to my embryos if I stop paying or change my mind?
- Can I move my embryos to another clinic?
Hospitals with IVF & Fertility in Turkey
Frequently asked questions
It is the freezing of embryos made during IVF or ICSI so they can be stored and transferred later. The usual method is vitrification, which cools the embryo in liquid nitrogen so fast that damaging ice crystals do not form.
In good laboratories the large majority of vitrified embryos survive warming undamaged. A small share do not survive, and survival does not guarantee implantation, so ask the laboratory for its own survival figures.
Freezing is roughly €300 to €900, with storage about €100 to €400 per year, against about €500 to €1,300 and €250 to €500 in the UK. The hospital confirms its fees in a written quote.
Biologically there is no known limit, but rules apply. The UK allows ten years, extendable in some cases; in Turkey the regulation and your consent decide, so ask the hospital for the current storage period.
Often it is similar, and in some groups, such as women at risk of OHSS, a freeze-all approach is safer. It is not clearly better for everyone, so the decision is individual.
The freezing itself happens in the laboratory and needs no procedure or recovery for you. Any discomfort relates to egg collection earlier in the cycle, which is done under sedation.
Embryos are already fertilised and need sperm at the time of freezing, while eggs are frozen on their own. Egg freezing suits women without a partner, but fewer eggs survive and fertilise than embryos.
Studies following children born from frozen embryos for many years report outcomes broadly similar to other IVF births. Some research points to differences such as higher birth weight, which is still being studied.
It is possible with consent forms, import and export paperwork and a specialised courier, but not every country or clinic accepts them. Ask both clinics before you start.
Plan 10 to 14 days for a full IVF cycle that includes freezing. A later frozen transfer needs a shorter visit, usually about one week, which the hospital will confirm.