At a glance
Understand the typical timeline between PGT biopsy and frozen embryo transfer (FET) in Thailand, including the waiting period for genetic results and cycle preparation steps.
At a Glance: Timeline from PGT Biopsy to FET
- Genetic analysis: Results typically take several days to a few weeks, depending on the laboratory and type of testing.
- Cycle preparation: After results, the next menstrual cycle or a medicated preparation cycle is needed before transfer.
- Total wait: Usually one to two menstrual cycles, but confirm exact timing with your treating clinic.
Understanding the PGT and FET Process
Preimplantation genetic testing (PGT) involves biopsying a few cells from an embryo before transfer. After biopsy, embryos are frozen (vitrified) while the genetic material is analyzed. The frozen embryo transfer (FET) is then scheduled once results are available and the recipient’s uterine lining is prepared.
Step 1: Embryo Biopsy and Freezing
On day 5 or 6 of embryo development, a small number of cells are removed from the trophectoderm (future placenta). The embryo is immediately vitrified and stored. This procedure is performed at the IVF laboratory.
Step 2: Genetic Analysis Time
The biopsied cells are sent to a genetics laboratory. The time required for analysis depends on the type of PGT:
- PGT-A (aneuploidy screening): Typically 5–14 days.
- PGT-M (monogenic disorders): May take longer, often 2–4 weeks, as it requires customized probes.
- PGT-SR (structural rearrangements): Similar timeline to PGT-A.
Exact turnaround times vary by lab and should be confirmed with your clinic.
Step 3: Receiving Results and Embryo Selection
Once the genetic report is ready, your fertility specialist will review the results and identify which embryos are suitable for transfer. This step may involve a consultation to discuss findings and next steps.
Step 4: Preparing the Uterine Lining for FET
After selecting an embryo, the recipient’s uterine lining must be prepared for implantation. This can be done in two ways:
- Natural cycle: Monitoring ovulation and timing transfer accordingly. This may take one full menstrual cycle.
- Medicated cycle: Using estrogen and progesterone to control lining growth. This typically takes 2–4 weeks from the start of medication.
The choice depends on individual medical factors and clinic protocols.
Total Typical Timeline
From the day of biopsy to the FET procedure, the total wait is often between 4 to 8 weeks. However, this can vary based on:
- Laboratory processing time
- Recipient’s menstrual cycle timing
- Clinic scheduling
- Any additional testing or delays
Some clinics may schedule FET in the cycle immediately following biopsy if results return quickly and the recipient’s cycle aligns. Others may recommend a rest cycle.
Questions to Ask Your Clinic
- What is the estimated turnaround time for PGT results from your lab?
- Will I need to wait for a natural cycle or can I start medicated preparation immediately?
- How long after receiving results can we schedule the transfer?
- Are there any factors that could delay the transfer (e.g., lab holidays, embryo thawing issues)?
Next Steps Checklist
- Confirm PGT result timeline with your clinic.
- Discuss cycle preparation options (natural vs. medicated).
- Plan travel and accommodation around the estimated transfer date.
- Ensure all legal and consent forms are completed.
Frequently asked questions
Can I have a frozen embryo transfer in the same cycle as the PGT biopsy?
Typically no, because genetic analysis takes time. The embryo is frozen after biopsy, and transfer occurs in a later cycle once results are available and the uterine lining is prepared.
Does the waiting time differ for PGT-A vs. PGT-M?
Yes. PGT-A results often come back within 1–2 weeks, while PGT-M may take 2–4 weeks or longer due to the need for customized genetic probes.
How long does it take to prepare the uterine lining for FET?
In a medicated cycle, preparation typically takes 2–4 weeks. In a natural cycle, it depends on your ovulation timing and may take one full menstrual cycle.
What if my PGT results are delayed?
Delays can happen due to laboratory workload, technical issues, or sample quality. Your clinic will inform you of any changes and adjust the transfer schedule accordingly.
Do I need to stay in Thailand during the entire waiting period?
Not necessarily. Many patients return home after the biopsy and come back for the transfer once results are ready. Confirm with your clinic about their recommendations and any required in-person visits.
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.
Need help turning research into a shortlist?
