Taking Your Embryos Abroad for IVF: The Evidence, the Paperwork, and One Family's Journey

Most parents arrive at this question the same way. The treatment is happening in another country, the embryos are here, and nobody has given a straight answer about how they get from one place to the other — or whether they will still be viable when they arrive. This guide is an attempt at a straight answer. It sets out what the published research says about frozen material that travels, what the paperwork actually requires in the countries families are heading to, and what one family's transfer from the United States to Iran looked like from their side of it. Where the evidence is thin, or where a country's rules are moving, the page says so rather than smoothing it over.

What actually happens to your embryos in transit

Frozen embryos are not simply cold. Vitrification takes them from body temperature to roughly minus 196 degrees in under a second, fast enough that the water inside never organises itself into ice crystals. What forms instead behaves like glass. That distinction matters for transport, because glass is stable as long as it stays below its transition temperature, and the thing that damages an embryo is not the cold — it is warming, even briefly, and then cooling again.

So a transport container has one job. The MVE SC 4/3 we use is a vapour-phase dry shipper: liquid nitrogen is absorbed into a porous liner, and the material sits in the cold vapour above it rather than in free liquid. There is no power supply, no compressor and nothing to fail mid-journey. Charged correctly, it holds temperature for up to 21 days, which is the margin that makes a delayed flight an inconvenience rather than a disaster. It is classified UN3373, it is exempt from dangerous-goods rules, and it travels in the cabin as hand baggage. It is never checked in and never sent as cargo.

That last point is the one parents tend to find reassuring once it lands. For the whole journey the tank is in a seat, with a person who is responsible for it.

What the research actually says about material that travels

Here is the baseline. In a 2024 study of more than 3,600 warmed eggs at a single centre, survival after warming was 92 per cent, and among patients who reached transfer of a chromosomally normal blastocyst, pregnancy and live-birth rates were statistically indistinguishable between previously frozen and fresh eggs. Modern vitrification is good. That is the context for everything below.

Now the finding that most couriers would rather not mention. A 2022 study followed women who had frozen eggs at one Jerusalem centre and later came back to use them. Some were warmed in the same laboratory that froze them. Others were shipped elsewhere first. Survival in-house was 78 per cent. Survival after shipping was 63 per cent. The difference was statistically significant.

We think you should know that, and we think you should also know exactly how far it goes. The study looked at eggs, not embryos, and eggs are the most fragile thing a fertility laboratory handles. It was retrospective, at one centre, and the shipped group was small. Most importantly, it cannot separate transport from what happened afterwards, because the receiving laboratories did their own warming using their own protocols. A difference in warming technique would show up in exactly the same number. So the honest reading is not "shipping costs you 15 percentage points." The honest reading is that moving material introduces more than one new variable, and that nobody has yet published a study clean enough to say how much of the risk belongs to the journey itself.

Anyone who tells you the research shows transport is risk-free has not read it. Anyone who tells you it shows transport ruins embryos has not read it either.

What a courier controls, and what it does not

Given the above, the useful question is narrower than "is it safe". It is: which of the variables can actually be managed, and by whom?

We control custody, which means the tank is not handed to a third party at any point in our leg of the journey. We control temperature, by charging the tank properly and by building in far more hold time than the route needs. We control whether the material goes through an X-ray machine — our position there is absolute, manual inspection is arranged in advance at both airports or the shipment does not move. We control the documentation, which in practice is what decides whether a tank clears customs or sits in an office over a weekend. And we control the route, because a direct hand-carry has fewer handover points than a chain of carriers.

We do not control the receiving laboratory's warming protocol, and on the evidence above that may matter as much as anything we do. We do not control the quality of the material itself, which was set long before we were involved. We cannot promise an outcome, and you should be wary of anyone in this industry who does. What we can do is remove the variables that are removable, and tell you plainly which ones are not.

Why families move material across borders at all

A 2022 systematic review of patient and clinician experiences found two reasons dominating every other: the cost of treatment at home, and whether the treatment a family needs is lawful where they live. After those came a cluster of reasons that get discussed less — shared language, shared religion, and simple cultural familiarity. Families go where they can be understood as well as treated.

The American Society for Reproductive Medicine's ethics committee has looked at the same phenomenon and reached a measured conclusion: cross-border care brings real benefits to some patients and real risks to others, and the duty on professionals is to inform rather than to steer. We take the same view. There are good reasons to move treatment abroad and good reasons to stay. The decision belongs to you and to the clinicians advising you, and this page is not an argument for either.

One practical note from that literature worth carrying with you: plan in advance who resumes your care afterwards, and on what information. Continuity is the part families most often forget to arrange.

The paperwork is what decides whether a transfer happens

Transport failures are almost never cryogenic. They are administrative. A tank that is correctly charged and correctly routed still goes nowhere if one letter is missing, and the letters have to come from the right people.

Permission to export is obtained by the clinic holding the material, not by the courier. In the United Kingdom there is no such thing as an HFEA export licence, a phrase that circulates widely and is simply wrong; the mechanism is a General Direction, exceptionally a Special Direction, and the obligation sits with the licensed clinic. Elsewhere the equivalent is usually a permit from the health ministry, applied for by the sending clinic and naming the courier.

Alongside that sit the documents that make the journey itself possible. The receiving clinic confirms in writing that it will accept the material. Both clinics issue letters to their own airport's security asking for manual inspection instead of X-ray. The destination needs a customs release letter, which is the document that determines whether the tank clears on arrival or is held. And the airline has to approve the tank as cabin baggage in advance — the container is exempt from dangerous-goods rules, but exemption is not permission, and approval is granted per booking by the airline's cargo or dangerous goods division rather than by its customer service line.

The realistic lesson is that the timeline is set by whichever ministry is slowest, not by the flight. Families who start the paperwork early almost never have a problem. Families who book a flight first almost always do.

Moving material within the European Union

Inside the EU the framework has been the Tissues and Cells Directive, which sets standards for the coding, traceability and import and export of human tissues and cells, implemented separately by each member state. That is changing. Regulation (EU) 2024/1938 on substances of human origin — the SoHO Regulation — was adopted in June 2024 and applies from 7 August 2027, at which point the existing directive stops applying. It is a regulation rather than a directive, so it takes effect directly rather than through national transposition, and it treats embryos, eggs and sperm as a defined category.

For a family moving material between EU clinics before 2027, the practical position is unchanged: your clinics work within their own national implementation, and traceability is the thing every inspector cares about. For anyone planning further ahead, it is worth asking your clinic how it is preparing. Our country-by-country guide to how embryo and gamete transport is regulated goes through the frameworks in more detail.

Kyrgyzstan — an emerging destination with rules in motion

Kyrgyzstan has become a visible destination for families seeking surrogacy, and it is the country on this page where we would most strongly urge you to check the date on anything you read.

As matters stood in August 2026, Kyrgyz law permitted surrogacy for citizens on medical grounds under a notarised contract, and set no separate restriction on foreign nationals using those services. On 10 August 2026 a draft bill was published for public consultation that would change this. It would add to Article 104 of the Law on the Protection of Citizens' Health a provision limiting surrogacy contracts to Kyrgyz citizens, with a single exception where a Kyrgyz citizen is officially married to a foreign national. Kyrgyz press reported the proposal as a response to the proportion of children born through surrogacy there being registered to foreign parents.

At the time this page was written we could find no record that the bill had been adopted. That is the whole point of saying so plainly: it is a proposal, not a law, and it may or may not become one. If you are considering a Kyrgyz route, the status of that bill is the first thing to establish with a Kyrgyz lawyer, before any money moves and before any material does. Note also that transporting biological material into a country and being eligible for treatment there are two separate questions with two separate answers, and a change to one does not automatically change the other.

Tajikistan — where the honest answer is that the framework is not published

We looked for a Tajik statute or regulator governing assisted reproduction and could not find one in the English-language medical or legal literature. What exists is a national reproductive health programme run with UNFPA support, which concerns family planning and access to services rather than the licensing of fertility clinics or the movement of biological material.

We are not going to invent a framework to fill that gap, and we would treat any page that confidently describes Tajik ART law with caution unless it cites the statute. In practice this means a Tajik transfer is defined by the receiving clinic and the relevant ministry on a case-by-case basis, and the documentation requirements have to be established at the start rather than assumed. That is workable — it simply takes longer, and it means the receiving clinic's willingness to engage with the paperwork is the single most important thing to test early. The route itself is well established; our UK to Tajikistan corridor page covers the logistics.

Iran — the most-travelled route on this page

Iran is where most of the material we move is going, and it is the destination parents ask about most, usually because they have read something contradictory.

Here is what the peer-reviewed literature describes. Iran is the only Muslim-majority country to have passed legislation specifically on embryo donation — the Embryo Donation to Infertile Spouses Act of 2003. Beyond that single statute, assisted reproduction in Iran has largely been authorised through jurisprudential decrees rather than a single governing statute. On surrogacy specifically, a paper in the Journal of Medical Ethics records that most Shia scholars have issued decrees permitting gestational surrogacy as a treatment for infertility, for legally married couples, where most Sunni scholars have not — the reasoning being that it transfers an embryo from one womb to another. The same literature is candid that questions of kinship and inheritance remain contested, and that payment to a surrogate attracts ethical criticism within Iran itself.

What that means practically for a family arranging transport: Iranian clinics will generally expect documentation establishing that the intended parents are legally married, and translations are usually required. Confirm the exact list with the receiving clinic rather than with a courier — including us. We are a logistics company, we do not arrange treatment, and we are not in a position to advise on your eligibility.

If you want the transport mechanics rather than the legal background, our step-by-step guide to transferring embryos to a clinic in Iran sets out the documents and the timeline, and our informational guide to surrogacy covers the wider picture.

Malaysia — strong clinics, narrow rules

Malaysia has built a genuine regional reputation in fertility medicine, and it is a common destination for families across Asia and the Gulf. The regulatory picture is more particular than the clinical one.

A 2021 paper in Frontiers in Reproductive Health describes the position bluntly: there is no written reproductive-law policy in Malaysia, and practice is shaped by professional guidelines together with religious rulings. The same paper records that gametes are expected to come from a married couple, that embryo transfer requires a valid marital contract, that cryopreservation is permitted while a couple remains married, and that surrogacy is generally not permitted among Muslims. A national ruling from 1981 addressed sperm banking.

The practical consequence for transport is straightforward. Malaysia is usually a destination for a couple moving their own material for their own treatment, and arrangements involving a third party are a different conversation that belongs with a Malaysian clinic and a Malaysian lawyer before anything is shipped. Our guide to embryo transport to Malaysia covers the route itself, and why Muslim families choose countries like Iran or Malaysia covers the reasoning families give us.

One family's transfer, from the United States to Iran

Everything above is general. This is specific. The couple below moved their embryos from the United States to Iran with us, and recorded this afterwards. They are shown and quoted with their written consent.

Transcript

"It took two weeks, and we just got it to our Embryo Links, from the United States to Iran. So in order to transport our embryos, we choose Embryo Links company, because we did a lot of research, and our obstacle was of course not a lot of companies sending embryos to Iran. And we were lucky enough to find them, because it's a direct transfer, so we don't need to worry about anything. And it was like a saver, and it was fast. So of course, it's all hand carry. You probably — whoever did research — know it's a hand carry in an airplane. And they registered in UK, so that's another reason we were working with them. And they just came here. And now we have baby. Yay!"

Two notes in the interest of accuracy. The family refer to us as registered in the UK; Embryo Links is registered as Embryo Links FZE LLC in Ajman, United Arab Emirates, and operates a UK contact office. And one family's result is their own — it is not a predictor of anyone else's outcome, and nothing on this page should be read as a promise of one.

Where the facts on this page come from

Most writing about moving embryos abroad cites nothing at all. These are the sources behind the claims above, so you can check them rather than take our word for it.

• Murugappan G, et al. Clinical utilization and outcomes over eight consecutive years following oocyte cryopreservation. Journal of Assisted Reproduction and Genetics, 2024. doi:10.1007/s10815-024-03334-z
• Tsafrir A, et al. Clinical outcome of planned oocyte cryopreservation at advanced age. Journal of Assisted Reproduction and Genetics, 2022. doi:10.1007/s10815-022-02633-7
• McLean L, et al. Patient and clinician experiences with cross-border reproductive care: a systematic review. Patient Education and Counseling, 2022. doi:10.1016/j.pec.2022.03.016
• Ethics Committee of the American Society for Reproductive Medicine. Cross-border reproductive care: an Ethics Committee opinion. Fertility and Sterility, 2022. doi:10.1016/j.fertnstert.2022.01.012
• Aramesh K. Iran's experience with surrogate motherhood: an Islamic view and ethical concerns. Journal of Medical Ethics, 2009. doi:10.1136/jme.2008.027763
• Afshar L, Bagheri A. Embryo donation in Iran: an ethical review. Developing World Bioethics, 2012. doi:10.1111/j.1471-8847.2012.00334.x
• Shamsi Gooshki E, Allahbedashti N. The process of justifying assisted reproductive technologies in Iran. Indian Journal of Medical Ethics, 2015. doi:10.20529/IJME.2015.027
• Ahmad MF, et al. Oncofertility in Islam: the Malaysian perspective. Frontiers in Reproductive Health, 2021. doi:10.3389/frph.2021.694990
• Regulation (EU) 2024/1938 on standards of quality and safety for substances of human origin intended for human application.
• Kyrgyz draft bill on surrogacy, reported 10 August 2026 (24.kg). Status at the time of writing: published for public consultation, not adopted.

Frequently asked questions

Does shipping frozen embryos damage them?

There is no published evidence that correctly maintained cryogenic transport damages embryos. One 2022 study did find lower survival for eggs that had been shipped compared with eggs warmed in the laboratory that froze them, but it studied eggs rather than embryos and could not separate the effect of the journey from the effect of the receiving laboratory's warming technique. The damaging event in cryogenics is a warming excursion, which is what a properly charged vapour-phase shipper and continuous custody exist to prevent.

How long can the tank keep my embryos cold?

The MVE SC 4/3 dry shipper holds temperature for up to 21 days when charged correctly. A typical international transfer takes a small fraction of that, and the surplus is deliberate — it is what turns a cancelled flight into a delay rather than an emergency.

Will my embryos go through an airport X-ray machine?

Not with us. We arrange manual inspection in advance at both the departure and arrival airports, supported by letters from each clinic addressed to airport security. If manual inspection cannot be secured, the shipment does not travel.

Do I need an HFEA export licence to move embryos out of the UK?

No, because no such document exists. The mechanism in the UK is a General Direction, exceptionally a Special Direction, and the responsibility sits with the licensed clinic holding the material rather than with you or with the courier. Your clinic will know the process; if a courier offers to obtain an HFEA export licence for you, treat that as a sign they do not work in this field often.

Can I transport embryos to Kyrgyzstan?

Transport and treatment eligibility are separate questions. As of August 2026 Kyrgyz law set no specific restriction on foreign nationals using surrogacy services there, but a draft bill published for public consultation on 10 August 2026 would limit surrogacy contracts to Kyrgyz citizens, with an exception for a Kyrgyz citizen married to a foreign national. We found no record of that bill being adopted at the time of writing. Anyone planning this route should confirm its current status with a Kyrgyz lawyer before committing.

How long does the whole process take?

The journey itself is usually a day. The paperwork is what sets the timeline, and it is governed by whichever authority is slowest to respond — commonly a health ministry issuing an export permit to the sending clinic. Several weeks is normal, and starting the documentation before booking any travel is the single thing that most reliably prevents delay.

Who actually carries the tank?

A trained courier travels with it as cabin baggage, in a seat, for the whole of our leg of the route. It is never checked into the hold and never sent as freight. All our staff hold UN3373 qualification, and our transport procedures sit within an ISO 9001 quality management system.