At a glance
Understand why PGT usually requires frozen embryo transfer, when fresh transfer might be possible, and what to discuss with your clinic.
Fresh vs. Frozen Embryo Transfer After PGT: The Basics
If you are planning IVF with preimplantation genetic testing (PGT) in Thailand, you may wonder whether a fresh embryo transfer is possible. The short answer is that PGT almost always requires freezing embryos because the testing process takes several days, which extends beyond the window for a fresh transfer. However, there are exceptions and important planning considerations.
Why PGT Usually Requires Freezing
PGT involves biopsying a few cells from an embryo on day 5 or 6 of development. The cells are then sent for genetic analysis, which typically takes 5–14 days. By the time results are available, the uterine lining may no longer be receptive for implantation. Therefore, embryos are vitrified (frozen) and stored until a subsequent frozen embryo transfer (FET) cycle.
When Fresh Transfer Might Be Possible
In rare cases, a clinic may offer a fresh transfer if the biopsy and analysis can be completed within a very short timeframe (e.g., using rapid PGT methods) and the uterine lining is still optimal. However, this is not standard practice. Most clinics in Thailand recommend FET to allow time for genetic results and to plan the transfer in a natural or medicated cycle.
Planning Your Timeline
If you are traveling to Thailand for IVF with PGT, expect at least two trips: one for egg retrieval and embryo creation, and another for the frozen embryo transfer. The interval between trips can range from a few weeks to several months, depending on your cycle and clinic schedule.
Questions to Ask Your Clinic
- What is your standard protocol for PGT – fresh or frozen transfer?
- Do you offer rapid PGT that might allow a fresh transfer?
- What are the success rates for frozen vs. fresh transfers after PGT at your clinic?
- How long should I plan between retrieval and transfer?
Next Steps
Discuss your specific situation with your fertility specialist. They can advise whether a fresh transfer is medically appropriate based on your age, ovarian response, embryo quality, and uterine health. For most patients, a frozen transfer after PGT is the safest and most effective approach.
Frequently asked questions
Can I do a fresh embryo transfer after PGT in Thailand?
It is uncommon because PGT results take several days, which usually exceeds the optimal window for fresh transfer. Most clinics recommend frozen embryo transfer (FET) after PGT.
Why is frozen transfer preferred after PGT?
Freezing allows time for genetic analysis without rushing the transfer. It also lets you prepare the uterine lining in a separate cycle, which may improve implantation rates.
Are there any exceptions where fresh transfer is possible?
Some clinics may offer rapid PGT that can provide results within 24–48 hours, potentially allowing a fresh transfer. However, this is not standard and depends on the clinic's technology and your medical profile.
How long do I need to wait between egg retrieval and frozen transfer?
The waiting period varies. After your menstrual cycle returns post-retrieval, you can begin preparation for FET. This can take 2–6 weeks, depending on your cycle type and clinic protocol.
Does frozen transfer affect success rates compared to fresh?
For PGT-tested embryos, frozen transfer success rates are generally comparable or even higher than fresh transfer, as the uterine lining can be optimally prepared. Discuss your clinic's specific data with your doctor.
Continue your research
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.
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