PGT Embryo Freezing and Frozen Transfer in Thailand: A Planning Guide for International Patients

After preimplantation genetic testing (PGT), many patients in Thailand use a freeze-all approach: embryos are cultured, biopsied, vitrified (fast-frozen), and stored while genetic results are processed. A later frozen embryo transfer (FET) lets you plan the transfer cycle separately, often after results are reviewed. The exact sequence, storage rules, and timing depend on your clinic, your embryo report, and your medical situation, so treat this as a planning map rather than a personal treatment plan.

At a glance

• Freeze-all means no fresh transfer in the same cycle as egg retrieval; embryos are vitrified and stored.
• PGT involves a small biopsy, usually at the blastocyst stage, and laboratory analysis while embryos remain frozen.
• FET is a separate cycle: your uterus is prepared, one or more embryos are thawed, and transfer is scheduled.
• Travel usually splits into two trips: retrieval/PGT and a later transfer cycle, though some clinics offer monitoring options closer to home.
• Confirm directly all storage terms, costs, consent, shipping rules, and legal requirements with your treating clinic and relevant authorities.

Why a freeze-all strategy is often used with PGT

PGT requires time. After egg retrieval and fertilisation, embryos need several days of culture to reach a stage where a biopsy can be taken safely. The biopsy sample is then analysed, and results are reported back to your clinic. Because that process does not fit neatly into a fresh-transfer window, many clinics vitrify the embryos first and plan transfer after results are available.

Freeze-all can also allow the ovaries and hormone environment to settle after stimulation, which some clinicians prefer before preparing the uterus for transfer. However, whether freeze-all is recommended for you is a medical decision. It depends on factors such as your response to stimulation, embryo development, the number of embryos available, and your clinic’s laboratory protocols. Ask your treating doctor to explain the reasoning for your specific case.

How vitrification works in plain terms

Vitrification is a rapid cooling method used to freeze embryos. Instead of forming ice crystals, the embryo is exposed to special solutions and cooled very quickly so it becomes a glass-like solid. This approach is widely used in modern IVF laboratories because it can support good survival rates after thawing, though no method guarantees a particular outcome.

For PGT, the biopsy is typically taken before vitrification. The embryo is then frozen while the laboratory analyses the biopsy. When results are ready, your clinic reviews which embryos are suitable for transfer based on the report and your clinical picture. Not every embryo will have a result, and not every result leads to a transfer; your clinic should explain what the categories in your report mean for you.

The step-by-step timeline after PGT

Exact timelines vary by clinic, laboratory, and patient. The sequence below is a general planning framework, not a schedule you should assume applies to you.

1. Retrieval and fertilisation: Eggs are collected and fertilised in the laboratory.
2. Embryo culture: Embryos develop for several days, often to the blastocyst stage.
3. Biopsy and vitrification: A small sample is taken for PGT, and embryos are frozen.
4. Genetic analysis: The laboratory processes the biopsy and reports results to your clinic.
5. Results review: Your doctor discusses which embryos may be suitable for transfer and what the findings mean.
6. FET cycle preparation: Your uterus is prepared, often with medication to control the cycle. Monitoring may include blood tests and ultrasound.
7. Thaw and transfer: The chosen embryo is thawed and transferred, usually as a short outpatient procedure.
8. Post-transfer follow-up: Your clinic advises on activity, medication, and when to test for pregnancy.

Some clinics offer a “freeze-all then transfer” pathway with a planned break of one or more cycles. Others may adjust based on your recovery, travel plans, or results. Ask your clinic to map the likely sequence for you in writing, including which steps happen in Thailand and which, if any, could be done closer to home.

Storage: what to clarify before you commit

Embryo storage is a long-term commitment with practical, financial, and legal dimensions. Policies differ between clinics and can change, so confirm the details directly with your treating clinic before you rely on any assumption.

• Storage duration: How long can embryos be stored, and what happens at the end of that period?
• Consent and decision-making: Who decides what happens to stored embryos, and how are changes to consent handled?
• Fees and renewals: What are the storage fees, when are they due, and how are renewals handled?
• Contact and records: How will the clinic reach you if a payment or consent renewal is due?
• Shipping or transfer: If you later want embryos moved to another clinic or country, what is involved, and what rules apply?
• Disaster or closure planning: What is the clinic’s policy if it closes, relocates, or changes laboratory arrangements?

For a broader look at how storage costs are typically structured, see embryo storage cost in Thailand. Treat any figures you see online as examples to verify, not quotes.

Planning travel for a frozen transfer

International patients often split treatment into two trips: one for retrieval and PGT, and another for the FET cycle. The second trip is usually shorter, but it still requires coordination.

• Cycle monitoring: Ask whether any monitoring can be done in your home country and shared with your clinic.
• Medication timing: Confirm how prescriptions, start dates, and time zones are managed.
• Length of stay: Ask how many days you should plan to be in Thailand before and after transfer.
• Flexibility: Build in buffer days in case monitoring results suggest a change to your schedule.
• Companion and work planning: Consider whether you want a companion and how much time off you can arrange.

For a general overview of treatment pathways, see the treatment process and IVF in Thailand. For practical travel and coordination questions, see information for international patients.

Questions to ask your clinic before you plan

Write these down and ask for written answers where possible. Policies vary, and the answers matter more than any general guide.

1. Is freeze-all recommended for my situation, and why?
2. At what stage are embryos biopsied and vitrified at your clinic?
3. How long do PGT results usually take, and how will I receive them?
4. What are your storage terms, fees, and consent requirements?
5. How do you plan a FET cycle, and what monitoring is required?
6. Can any monitoring be done in my home country?
7. What is the recommended length of stay for the transfer trip?
8. What costs are included, and what might be billed separately?
9. What documents do I need to bring, and are there legal or administrative requirements I should check?
10. Who is my main contact for coordination, and how do we communicate?

What this guide cannot tell you

This article does not provide medical advice, predict outcomes, or confirm prices, legal rules, or clinic-specific services. Embryo freezing, PGT, and FET decisions depend on your medical history, your embryos, and your clinic’s protocols. Always confirm details with your treating clinic and, where relevant, with the appropriate authorities in Thailand and your home country.

Next-step checklist

• Ask your clinic for a written outline of the freeze-all and FET pathway.
• Request storage terms, consent forms, and fee schedules in writing.
• Clarify which monitoring can be done locally and how results are shared.
• Map your travel dates with buffer time and confirm medication plans.
• Keep a single point of contact at the clinic for coordination.
• Review any legal or shipping questions with the relevant authority before you need them.

Frequently asked questions

How long does it take to get PGT results before a frozen transfer?

Timelines vary by laboratory, the type of PGT requested, and how samples are processed. Some clinics report results within a few weeks, but this is not guaranteed. Ask your treating clinic for the typical range for your case and how results will be communicated to you.

Can I do part of the frozen transfer cycle in my home country?

Some clinics allow monitoring such as blood tests and ultrasound to be done locally, with results shared for review. Whether this is possible depends on your clinic's protocols and your medical situation. Confirm directly with your treating clinic before arranging local appointments.

What happens to my embryos if I cannot travel for the transfer?

Storage arrangements, consent, and any options for shipping or transferring embryos depend on your clinic's policies and the rules that apply. Discuss contingency planning with your clinic in advance, including storage renewals and who to contact if your plans change.

Is a frozen transfer after PGT different from a fresh transfer?

A frozen transfer is a separate cycle: embryos are thawed and transferred after your uterus is prepared. A fresh transfer would happen in the same cycle as retrieval. Which approach is recommended depends on your medical situation and your clinic's protocols, so ask your doctor to explain the reasoning for your case.

What costs should I expect for freezing, storage, and FET?

Costs vary widely and are usually itemised across retrieval, PGT, vitrification, storage, monitoring, medication, and transfer. This guide does not provide figures. Ask your clinic for a written breakdown and clarify which items are included, which are billed separately, and when payments are due.

Continue your research

• Embryo storage cost and contract guide
• IVF in Thailand guide
• Treatment journey

Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.