PGT-A Biopsy Timing in Thailand: What to Expect

If you are considering preimplantation genetic testing for aneuploidy (PGT-A) during IVF in Thailand, one of the first questions you may have is: when does the embryo biopsy actually happen? In most Thai IVF clinics, the biopsy is performed on embryos that have reached the blastocyst stage, typically on day 5 or day 6 after fertilization. This timing is important because it affects your treatment schedule, your travel plans, and the coordination between your clinic and the genetic testing laboratory.

This guide explains the general process of PGT-A biopsy in Thailand, what to expect at each step, and the questions you should ask your clinic to confirm the details that apply to your specific situation.

At a Glance: PGT-A Biopsy Timing

• Biopsy is usually done on day 5 or day 6 after egg retrieval and fertilization.
• The embryo must reach the blastocyst stage (a specific developmental milestone) before biopsy.
• Only a few cells are removed from the outer layer of the embryo (trophectoderm).
• The biopsied cells are sent to a genetic laboratory for analysis, while the embryo is frozen.
• Results typically take several days to a few weeks, depending on the laboratory.
• Your clinic will confirm the exact day and process based on your embryo development and lab protocols.

Why Day 5 or Day 6?

PGT-A is performed on embryos that have developed to the blastocyst stage. In a typical IVF cycle, embryos are cultured in the laboratory for about five to six days after fertilization. By day 5, many embryos have reached the blastocyst stage, which is a more advanced stage of development. Biopsying at this stage allows the embryologist to remove a small number of cells from the trophectoderm, which will later become the placenta. This is considered safer for the embryo than removing cells from the inner cell mass, which will become the fetus.

Some embryos develop more slowly and may not reach the blastocyst stage until day 6 or even day 7. In such cases, the biopsy may be performed on day 6 or later, depending on the clinic’s protocols and the embryo’s quality. The decision to biopsy on day 5 versus day 6 is based on the embryo’s development, not a fixed schedule.

The PGT-A Biopsy Process in Thai Clinics

While each clinic may have its own specific procedures, the general steps for PGT-A biopsy are similar across Thai IVF centers.

Step 1: Embryo Culture to Blastocyst Stage

After egg retrieval and fertilization, embryos are cultured in a specialized incubator. The embryologist monitors their development daily. By day 5 or 6, embryos that have reached the blastocyst stage are eligible for biopsy.

Step 2: Embryo Biopsy

On the day of biopsy, the embryologist uses a laser or a thin needle to create a small opening in the zona pellucida (the outer shell of the embryo). Then, a few cells from the trophectoderm are gently aspirated. This process is delicate and requires expertise to minimize any potential impact on the embryo.

Step 3: Genetic Analysis

The biopsied cells are placed in a tube and sent to a genetic testing laboratory. The laboratory analyzes the DNA to check for chromosomal abnormalities (aneuploidy). The embryo itself is frozen (vitrified) while waiting for the results.

Step 4: Embryo Transfer

Once the results are available, your doctor will discuss which embryos are chromosomally normal (euploid) and suitable for transfer. A frozen embryo transfer (FET) is typically scheduled in a subsequent cycle, after your uterus is prepared.

How Biopsy Timing Affects Your IVF Timeline in Thailand

If you are traveling to Thailand for IVF with PGT-A, understanding the timing is crucial for planning your stay. Here are the key points to consider:

• Egg retrieval to biopsy: The biopsy occurs about 5 to 6 days after your egg retrieval. You will need to be in Thailand for at least this period.
• Freezing and waiting: After the biopsy, the embryos are frozen. You may choose to return home while waiting for the genetic results, as the transfer will happen in a later cycle.
• Results timeline: The time it takes to receive PGT-A results can vary. Some laboratories may provide results within a few days, while others may take longer. Your clinic will give you an estimated timeline.
• Travel planning: Many international patients plan to stay in Thailand for the initial IVF cycle (including egg retrieval and biopsy) and then return for the frozen embryo transfer after results are available. This may involve two trips, but some patients choose to stay for the entire process. Discuss your travel plans with your clinic to understand the recommended schedule.

What to Ask Your Clinic About PGT-A Biopsy

Because every clinic and patient situation is unique, it is essential to confirm the following details directly with your chosen clinic:

• On which day (day 5, day 6, or later) does your clinic typically perform the biopsy?
• What is the estimated time for receiving PGT-A results?
• How many embryos are usually biopsied in a cycle?
• What is the experience of the embryology team with PGT-A biopsies?
• How does the clinic coordinate with the genetic testing laboratory?
• What is the recommended timeline for international patients, including travel and rest periods?
• Are there any specific instructions for the days leading up to the biopsy?

Next Steps: Planning Your PGT-A Cycle in Thailand

If you are considering PGT-A in Thailand, here is a simple checklist to help you move forward:

1. Research IVF clinics in Thailand that offer PGT-A and have experience with international patients.
2. Schedule a consultation to discuss your medical history and whether PGT-A is appropriate for you.
3. Ask about the clinic’s biopsy timing, laboratory accreditation, and result turnaround times.
4. Plan your travel and accommodation, keeping in mind the need to stay for at least the egg retrieval and biopsy.
5. Confirm the costs involved, including the biopsy procedure, genetic testing, and any additional laboratory fees.
6. Prepare for the possibility of a second trip for the frozen embryo transfer.

Remember, the information in this guide is general. Your doctor will provide personalized advice based on your specific circumstances.

Frequently asked questions

Is PGT-A biopsy always done on day 5?

No, not always. While day 5 is common, some embryos develop more slowly and may be biopsied on day 6 or later. The exact day depends on when the embryo reaches the blastocyst stage and the clinic's protocols.

How long does it take to get PGT-A results in Thailand?

The time can vary by laboratory. Some clinics may provide results within a few days, while others may take longer. Your clinic will give you an estimated timeline based on their lab arrangements.

Can I go home after the biopsy and return later for the transfer?

Yes, many international patients do this. After the biopsy, embryos are frozen, and you can return home while waiting for results. The transfer is usually done in a later cycle, so you may need to plan a second trip to Thailand.

Does the biopsy hurt the embryo?

The biopsy is a delicate procedure performed by experienced embryologists. It removes only a few cells from the outer layer of the embryo, and studies suggest it does not significantly impact the embryo's viability. However, the skill of the embryology team is important.

Continue your research

• PGT in Thailand overview
• 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.