The embryos you do not use: storage, costs and the decisions nobody warns you about

There is a conversation that almost never happens at the start of treatment, because at the start of treatment nobody wants to think about it: what happens to the embryos you do not transfer?

It has become a much more common situation. Preliminary 2023 data from the European IVF Monitoring Consortium, presented at ESHRE in July, recorded 401,483 frozen embryo transfer cycles against 158,649 fresh ones. When the standard approach is to grow embryos to blastocyst and freeze the cohort, a cycle that works often ends with two or three embryos still in a tank — sometimes for years, sometimes in a country you visited twice.

None of this is a problem. It only becomes one when it is left undecided.

Storage is a contract, and you should read it

Storage is billed, usually annually, and the first year is often bundled into the cycle price. Things worth establishing in writing before you leave:

• What the annual fee is after the included period, and whether it is fixed or indexed.
• How you will be invoiced, in what currency, and to which email address. This sounds trivial until you change email providers.
• What happens if a payment is missed. Ask specifically: is there a grace period, how many notices are sent, to which contacts, and what is the clinic entitled to do at the end of it? This is the single most important line in the contract and the one patients most often have never read.
• How you update your contact details, and whether there is a second contact on file.
• Whether storage can be transferred to another facility, and on what terms.

Set a calendar reminder for the renewal date, every year, independent of the clinic’s own reminders. Notices get filtered as spam. Clinics merge, rebrand and change billing systems. The redundancy costs you nothing.

What the consent forms already decided

The forms you signed before retrieval usually contain the answers to questions you have not thought about yet. They generally cover what should happen to stored embryos in scenarios such as:

• You complete your family and do not want further transfers
• You and your partner separate, or disagree
• One of you dies, or loses capacity
• The clinic loses contact with you entirely

The available options differ by country, by clinic and by the law that applies where the embryos sit — continued storage, use in a later transfer, discarding, donation to another patient, or donation to research are the usual set, but not all of them are offered everywhere. Mexico regulates clinics and laboratories through the Ley General de Salud with COFEPRIS licensing and inspection, but does not yet have a single comprehensive federal statute on assisted reproduction, which means the clinic’s own consent documents and the applicable civil law carry more of the weight. That is a reason to read them carefully, not a reason for alarm.

Ask for a copy of everything you signed, in a language you read fluently. If a clinic cannot produce your signed consents on request, that is worth knowing now rather than later.

The cross-border wrinkle

If you treated abroad, two ordinary life events become complications.

You move. Your embryos do not follow automatically. Continuing treatment elsewhere means either travelling back or arranging transport — which is entirely routine, but involves its own paperwork chain and costs.

Your circumstances change. A decision made comfortably by email at forty is harder to make at fifty, and much harder for someone else to make on your behalf if you never wrote it down.

The mitigation is the same in both cases: keep your own file. Signed consents, the storage contract, the lab’s summary of exactly what is stored and how it is labelled, and the name and direct email of a person at the clinic. Keep it where your partner or a trusted person can find it.

When you have finished treatment

Whatever you decide, decide it deliberately rather than by default. Paying storage fees for a decade because the decision felt too heavy to make is a real and very common outcome, and it is not neutral — it is a decision, just an unexamined one.

Some people continue storing because they are genuinely undecided, and that is a legitimate choice with a known price. Some transfer remaining embryos. Some donate them. Some discard them. Clinics that handle this well will offer counselling around the decision rather than a form to sign, and it is reasonable to ask for that support.

There is no version of this conversation that is easy. There is a version that is easier: the one you have early, in writing, when nothing is urgent and nobody is grieving.

If you are still mapping out what treatment involves from the beginning, read the patient journey.