PGT-A Testing in Thailand: What International Patients Should Know Before Starting

PGT-A (preimplantation genetic testing for aneuploidy) is a laboratory test performed on a small number of cells taken from an embryo during IVF. It looks for extra or missing chromosomes. It is not a treatment, not a guarantee of pregnancy, and not right for every patient. If you are an international patient planning IVF in Thailand, the practical questions are: what does the test actually tell you, how does it change the cycle timeline, what might a report show, and what should you confirm with the clinic before you start? This guide walks through those points in plain English.

At a glance

• What it is: a chromosome screening test on a biopsy of embryo cells, usually done in the laboratory before transfer.
• What it is not: a diagnosis of a specific disease, a guarantee of a healthy child, or a required step in IVF.
• Where it fits: after fertilisation and embryo development, before any embryo transfer.
• What a report may show: results described as euploid, aneuploid, mosaic, or inconclusive — each with different implications.
• What to confirm: who performs the biopsy, where testing happens, how results are explained, what happens to embryos that are not transferred, and the full cost picture.

What PGT-A is — and what it is not

PGT-A examines the number of chromosomes in the cells sampled from an embryo. Humans typically have 23 pairs of chromosomes. An embryo with the expected number is often described as euploid. An embryo with an extra or missing chromosome is described as aneuploid. Some embryos show a mix of cells with different chromosome numbers; these are described as mosaic.

PGT-A is different from PGT-M (which looks for a specific inherited condition) and PGT-SR (which looks at structural chromosome rearrangements). If you are exploring PGT generally, it helps to know which test is being discussed, because the purpose, the laboratory method, and the counselling needs differ.

PGT-A does not:

• diagnose a disease in an embryo or a future child;
• predict whether an embryo will implant;
• guarantee a pregnancy, a live birth, or a child without a health condition;
• replace other prenatal testing or clinical judgement.

It is one piece of information that you and your clinician may consider alongside your history, the embryo’s development, and your priorities.

How PGT-A fits into an IVF cycle

The exact sequence varies by clinic and by your protocol, but the general flow is:

1. Ovarian stimulation and monitoring — medications are used to encourage multiple eggs to mature, with monitoring visits.
2. Egg retrieval and fertilisation — eggs are collected and combined with sperm in the laboratory.
3. Embryo development — embryos are observed for several days. Biopsy for PGT-A is typically performed at a specific stage of development, as determined by the laboratory.
4. Biopsy and sample preparation — a small number of cells are removed from the embryo and prepared for testing.
5. Testing — the sample is analysed, either in the same laboratory or at a partner laboratory.
6. Results and discussion — you receive a report, and a clinician explains what the results may mean for your situation.
7. Transfer or storage — depending on results and your decisions, an embryo may be transferred, kept in storage, or handled according to the clinic’s policy and your consent.

Because testing takes time, PGT-A often means a frozen embryo transfer rather than a fresh transfer in the same cycle. That changes the timeline and may affect travel planning. Ask the clinic how many days or weeks are typically needed between retrieval and transfer in your case, and whether any steps can be done remotely.

What a PGT-A report may show

Reports vary in wording and detail. Common categories include:

Report term	Plain-English meaning	What it does not tell you
Euploid	The tested cells showed the expected number of chromosomes.	It does not guarantee implantation, pregnancy, or a child without a health condition.
Aneuploid	The tested cells showed an extra or missing chromosome.	It does not describe every cell in the embryo with certainty, and it does not by itself define what you should do next.
Mosaic	The tested cells showed a mix of chromosome patterns.	It does not predict a specific outcome, and interpretation may depend on the proportion and type of cells involved.
Inconclusive / no result	The laboratory could not produce a clear result from the sample.	It does not mean the embryo is affected or unaffected; it means the information is limited.

Some reports include additional detail, such as which chromosome was involved or the estimated percentage of mosaic cells. Ask the clinic to walk you through your own report line by line, and to explain the limits of the test in your specific case.

Who might consider PGT-A — and who might not

PGT-A is not universally recommended. Whether it is offered or discussed may depend on factors such as your age, your reproductive history, the number of embryos available, previous IVF cycles, and your personal preferences. Some patients choose it to gain information; others decide that the added cost, waiting time, and uncertainty are not worth it for them.

There is no single right answer. A useful conversation with your clinician covers:

• what information PGT-A could add in your situation;
• what it cannot tell you;
• what alternatives exist, including transferring an untested embryo;
• how you would use the result if it were euploid, aneuploid, mosaic, or inconclusive.

If you are not sure whether PGT-A is relevant to you, that is a clinical discussion, not a decision you need to make from a website.

PGT-A lab questions to ask before you commit

The laboratory side of PGT-A matters, and it is reasonable to ask direct questions. You can ask these before starting a cycle, and you can ask for written answers where possible.

• Where is the biopsy performed, and who performs it?
• Is testing done in-house or sent to an external laboratory? If external, which laboratory, and how are samples transported?
• What testing method is used, and what does the clinic say about its validation and quality controls?
• How are inconclusive or no-result cases handled, and is there a repeat-testing policy?
• How are mosaic results reported and explained?
• What is the clinic’s policy on embryos that are not transferred — storage, donation for research, or other options — and what consent is required?
• Who explains the report to you, in what language, and is an interpreter available if needed?
• What is the total cost of PGT-A, including biopsy, laboratory fees, shipping if applicable, storage, and any repeat testing?

If a clinic cannot answer these questions clearly, that is useful information for your decision-making.

Practical planning for international patients

PGT-A can affect how long you need to stay in Thailand, or how many trips you make. Because results take time and transfer is often in a later cycle, some patients plan two visits; others arrange monitoring locally and travel for key steps. The right plan depends on your protocol, your clinic’s requirements, and your own circumstances.

Before you book travel, confirm with the clinic:

• which appointments must be in person and which can be done remotely or locally;
• how results are communicated and how quickly;
• what happens if results are delayed or inconclusive;
• what documents, consent forms, or identification the clinic needs from you;
• what payment methods and currency arrangements are accepted;
• what the clinic’s policy is on cancellation, refunds, and storage fees.

For visa, entry, and legal questions, check with the relevant embassy, immigration authority, or a qualified legal professional. Clinic staff can sometimes point you to general information, but they are not a substitute for official guidance.

Costs: what to ask, not what to assume

PGT-A pricing is not standardised, and published figures can become outdated. Rather than relying on a number you saw online, ask for a written breakdown that separates:

• IVF cycle costs (monitoring, retrieval, laboratory work, medication);
• embryo biopsy;
• PGT-A laboratory analysis per embryo or per batch;
• embryo freezing and storage;
• frozen embryo transfer;
• any repeat testing or additional fees;
• consultations, interpretation, and follow-up.

Ask whether the quote is fixed or an estimate, what could change it, and when payment is due. This helps you compare clinics on a like-for-like basis and avoid surprises.

Limitations and uncertainty

PGT-A is a screening test with technical limits. A biopsy samples only a few cells, so it may not represent every cell in the embryo. Some embryos are mosaic, and the clinical meaning of mosaicism is an area of ongoing discussion. Results can be inconclusive. Even a euploid result does not guarantee that an embryo will implant or develop into a healthy child, and an aneuploid result does not necessarily mean an embryo could never produce a pregnancy — though many clinics and patients treat it as a reason not to transfer.

Because of these limits, PGT-A is best understood as one input among several. It does not remove the need for clinical judgement, and it does not replace prenatal testing or other care during pregnancy.

Next steps

1. Write down your questions, including the lab questions above.
2. Ask your clinic for a written summary of how PGT-A would fit into your cycle, including timeline and costs.
3. Ask how results would be explained to you, and in what language.
4. Consider what you would do with each possible result before you start.
5. Confirm travel, document, and payment logistics directly with the clinic and, where relevant, official authorities.

If you are at the beginning of your research, you may find it helpful to read our information for international patients, our overview of PGT in Thailand, our guides, and our FAQ.

Frequently asked questions

Is PGT-A required for IVF in Thailand?

No. PGT-A is an optional laboratory test, not a required part of IVF. Whether it is offered or recommended depends on your clinical situation and the clinic's practice. You can ask your clinician whether it is relevant for you and what the alternatives are.

Does a euploid result guarantee a successful pregnancy?

No. A euploid result means the tested cells showed the expected number of chromosomes, but it does not guarantee implantation, pregnancy, or a child without a health condition. Many other factors affect outcomes.

How long does PGT-A add to an IVF cycle?

Timelines vary by clinic, laboratory, and your protocol. Because testing takes time, transfer is often in a later cycle. Ask your clinic for an estimate for your specific situation and how it affects travel planning.

What should I ask about the laboratory doing the testing?

Ask where the biopsy is performed, whether testing is in-house or sent to an external laboratory, what method is used, how inconclusive results are handled, and who explains the report to you. Clear answers help you understand the process.

What happens to embryos that are not transferred after PGT-A?

Policies vary. Options may include continued storage, donation for research, or other choices, depending on the clinic and your consent. Ask the clinic to explain its policy and any associated fees before you start.

Continue your research

• International patient guide
• PGT in Thailand overview
• PGT and IVF guides

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.