At a glance
Deciding between fresh and frozen embryo transfer after PGT involves balancing timing, success rates, and medical considerations. This guide explains the key differences and what to discuss with your clinic in Thailand.
Understanding Fresh vs Frozen Embryo Transfer After PGT
After preimplantation genetic testing (PGT), you and your doctor will decide whether to transfer a fresh embryo or freeze all embryos for a later frozen embryo transfer (FET). This choice affects your treatment timeline, your body’s preparation, and potentially the success of implantation. In Thailand, both options are available, but the right choice depends on your individual medical situation, the results of PGT, and your clinic’s protocols.
At a Glance: Fresh vs Frozen Transfer
- Fresh transfer: Embryo is transferred in the same cycle as egg retrieval, typically 5–6 days after fertilization. No freezing involved.
- Frozen transfer (FET): Embryos are vitrified (frozen) after PGT and transferred in a later cycle, allowing time for your body to recover and for uterine preparation.
- PGT impact: PGT requires biopsy and often takes days to weeks for results, which may favor a frozen transfer to avoid delaying the window for fresh transfer.
- Success rates: Many studies show comparable live birth rates between fresh and frozen transfers, but individual factors matter. Discuss your specific prognosis with your doctor.
Key Differences in Timing and Process
Fresh Transfer Timeline
A fresh transfer occurs in the same ovarian stimulation cycle. After egg retrieval, fertilization, and embryo culture, the embryo is transferred on day 5 or 6 (blastocyst stage). PGT can be performed on a biopsy sample, but results may take several days. If results are not ready by the transfer day, the embryo may need to be frozen anyway. Fresh transfer may be suitable if PGT results are available quickly or if you prefer a single-cycle approach.
Frozen Transfer Timeline
In a frozen transfer, all viable embryos are vitrified after PGT. You then undergo a separate cycle (natural or medicated) to prepare the uterine lining for implantation. This typically occurs 4–8 weeks after egg retrieval, but timing can vary. FET allows your body to recover from ovarian stimulation, which may improve uterine receptivity. It also gives you time to plan travel to Thailand if you are an international patient.
Medical Considerations Unique to Thailand
Thailand has many IVF clinics experienced in PGT and both fresh and frozen transfers. However, as an international patient, you should consider:
- Travel logistics: Fresh transfer requires you to be in Thailand for the entire stimulation and transfer period (about 2–3 weeks). FET may allow you to return for a shorter stay after initial egg retrieval and freezing.
- Embryo shipping: If you plan to freeze embryos and transfer later, confirm your clinic’s policies on embryo storage and shipping to another location if needed.
- Legal and regulatory aspects: Thailand has specific laws regarding embryo handling and PGT. Ask your clinic about consent forms, storage limits, and what happens to unused embryos.
Success Rates: What the Research Shows
Large studies and meta-analyses indicate that for PGT-tested embryos, frozen transfer may yield slightly higher live birth rates than fresh transfer, possibly due to better uterine receptivity after a recovery cycle. However, fresh transfer can be equally successful for selected patients. Success depends on embryo quality, maternal age, uterine health, and other factors. Your clinic should provide its own success rates for fresh and frozen transfers with PGT, but remember that published rates may not reflect your individual chances.
Questions to Ask Your Clinic
- What is your clinic’s protocol for PGT timing? Can fresh transfer be done if results are ready in time?
- What are your success rates for fresh vs frozen transfer after PGT for patients with similar characteristics to mine?
- How long do you recommend waiting between egg retrieval and frozen transfer?
- What are the costs for fresh transfer versus FET (including medication, monitoring, and embryo storage)?
- If I choose FET, what is the process for preparing my uterine lining? Will I need additional medications?
Next Steps for International Patients
- Consult with your chosen clinic in Thailand to discuss your medical history and PGT results.
- Ask for a personalized recommendation on fresh vs frozen transfer based on your embryo quality and uterine health.
- Plan your travel timeline accordingly. For FET, you may need two trips: one for egg retrieval and one for transfer.
- Confirm all costs, including any additional fees for freezing, storage, and future transfer cycles.
- Review consent forms and legal requirements for embryo handling in Thailand.
Ultimately, the decision between fresh and frozen embryo transfer after PGT should be made with your doctor, considering your medical needs and personal preferences. Both options are viable, and Thailand offers experienced clinics to support your journey.
Frequently asked questions
Is frozen embryo transfer more successful than fresh after PGT?
Many studies show comparable or slightly higher live birth rates with frozen transfer after PGT, possibly due to better uterine receptivity after a recovery cycle. However, success depends on individual factors. Discuss your specific prognosis with your clinic.
How long does a frozen embryo transfer cycle take in Thailand?
A frozen transfer cycle typically takes 4–8 weeks from the start of uterine preparation to the transfer. The exact timeline depends on whether you use a natural or medicated cycle. Confirm with your clinic.
Can I do a fresh transfer if PGT results are not ready in time?
If PGT results are not available by the day of transfer, the embryo will need to be frozen and transferred in a later cycle. Some clinics may offer expedited PGT, but this is not always possible. Ask your clinic about their turnaround time.
What are the costs of fresh vs frozen transfer in Thailand?
Costs vary by clinic. Fresh transfer may be included in the initial IVF package, while frozen transfer involves additional fees for embryo freezing, storage, and a separate transfer cycle. Request a detailed cost breakdown from your clinic.
Do I need to stay in Thailand longer for a fresh transfer?
Yes, fresh transfer requires you to be in Thailand for the entire stimulation and transfer period, typically 2–3 weeks. Frozen transfer may allow a shorter stay for the transfer after initial egg retrieval and freezing.
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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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