At a glance
Learn what happens during a PGT-A embryo biopsy in Thailand, from embryo development to the biopsy procedure and what to expect afterward.
Understanding PGT-A and Embryo Biopsy
PGT-A (preimplantation genetic testing for aneuploidy) is a test that checks embryos for the correct number of chromosomes. During an IVF cycle, embryos are biopsied—a few cells are removed—and sent to a lab for analysis. This helps identify embryos that are more likely to implant and develop normally.
If you are planning IVF in Thailand with PGT-A, knowing what to expect can help you prepare. This guide walks through the typical steps, timing, and considerations.
At a Glance: PGT-A Biopsy Steps
- Embryos develop to the blastocyst stage (usually day 5 or 6).
- A few cells are removed from the outer layer (trophectoderm).
- Biopsied embryos are frozen while awaiting results.
- Results guide embryo selection for transfer.
Step 1: Embryo Development to Blastocyst
After egg retrieval and fertilization, embryos are cultured in the lab. For PGT-A, embryos need to reach the blastocyst stage—typically by day 5 or 6 of development. At this stage, the embryo has two distinct cell types: the inner cell mass (which becomes the fetus) and the trophectoderm (which becomes the placenta).
Not all embryos will reach the blastocyst stage. Your clinic will monitor development and advise you on how many embryos are suitable for biopsy.
Step 2: The Biopsy Procedure
On the day of biopsy, an embryologist uses a laser or a thin needle to make a small opening in the embryo’s outer shell (zona pellucida). Then, a few trophectoderm cells are gently removed. This is a delicate procedure performed under a microscope.
The biopsy is generally considered safe, but it is an invasive step. Your clinic should explain the technique they use and any potential risks.
Step 3: Freezing and Waiting for Results
After biopsy, embryos are frozen (vitrified) while the cells are sent to a genetics laboratory. The analysis can take several days to a few weeks, depending on the lab and the testing method. During this time, you will not have a transfer.
Your clinic will inform you of the expected timeline for results and next steps.
Step 4: Receiving Results and Planning Transfer
Once 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.
It is important to understand that PGT-A does not guarantee pregnancy or a healthy baby. It is a screening tool that helps select embryos with the best chance.
What to Ask Your Clinic
- What is your experience with embryo biopsy for PGT-A?
- How many embryos typically reach the blastocyst stage?
- What is the biopsy technique used, and what are the risks?
- How long will it take to get PGT-A results?
- What is the cost of biopsy and genetic testing?
- How many embryos are expected to be normal?
Next Steps: Preparing for Your Cycle
- Confirm your clinic’s biopsy protocol and timeline.
- Discuss how many embryos you hope to test.
- Plan for the waiting period after biopsy.
- Ask about any additional tests or consultations needed.
For more information on PGT in Thailand, see our PGT in Thailand guide. To understand the full IVF process, visit IVF in Thailand. If you are new to treatment, our treatment process overview can help. International patients may also find our international patient resources useful.
Frequently asked questions
What is the best day for embryo biopsy in Thailand?
Embryo biopsy for PGT-A is typically performed on day 5 or 6 of embryo development, when the embryo has reached the blastocyst stage. Your clinic will determine the exact timing based on embryo development.
Is embryo biopsy painful?
Embryo biopsy is performed on the embryo in the laboratory, not on the patient. It does not cause physical pain. The procedure involves removing a few cells from the embryo's outer layer.
What are the risks of embryo biopsy?
Embryo biopsy is generally considered safe, but there is a small risk of damage to the embryo. The procedure is performed by experienced embryologists to minimize risks. Discuss any concerns with your clinic.
How long does it take to get PGT-A results in Thailand?
PGT-A results typically take several days to a few weeks, depending on the laboratory and testing method. Your clinic will provide a specific timeline.
Does PGT-A guarantee a healthy baby?
No, PGT-A screens for chromosomal abnormalities but does not guarantee pregnancy or a healthy baby. It helps select embryos with the correct number of chromosomes, but other factors also affect outcomes.
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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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