How to Read Your PGT-A Results After IVF in Thailand: A Patient Guide

PGT-A (preimplantation genetic testing for aneuploidy) is a laboratory test that checks embryos created through IVF for extra or missing chromosomes. Your report will usually classify each embryo as euploid, aneuploid, mosaic, or inconclusive. These labels describe the chromosome result of the small sample tested — they do not guarantee that an embryo will implant, that a pregnancy will continue, or that a child will be healthy. This guide explains how to read the report, what mosaicism means, and how to prepare for genetic counselling in Thailand.

At a glance

• PGT-A looks at chromosome number, not at individual genes or overall embryo quality.
• Euploid means the sample showed the expected number of chromosomes; aneuploid means it did not.
• Mosaic means the result was mixed — some cells appeared normal and some did not.
• Reports vary between laboratories, so ask your clinic to walk you through your own document.
• Genetic counselling helps you weigh the result against your age, history and priorities.

What PGT-A actually tests

During IVF, an embryologist removes a few cells from an embryo, usually at the blastocyst stage. The laboratory then examines the DNA in those cells to estimate whether the embryo has the usual number of chromosomes — 46 in humans, arranged in 23 pairs.

PGT-A is different from PGT-M (which looks for a specific inherited condition) and PGT-SR (which looks at structural chromosome rearrangements). A PGT-A report will not tell you about single-gene disorders, and it will not tell you how an embryo looks under the microscope. It is one piece of information among several.

The main result categories

Report term	What it generally means	What it does not mean
Euploid	The tested sample showed the expected number of chromosomes.	It does not guarantee implantation, ongoing pregnancy or a healthy baby.
Aneuploid	The tested sample showed an extra or missing chromosome.	It does not describe every cell in the embryo with certainty.
Mosaic	The sample contained a mix of cells with different chromosome patterns.	It does not automatically mean the embryo should be discarded.
Inconclusive / no result	The laboratory could not produce a clear reading.	It does not mean the embryo is abnormal.

Some laboratories use additional wording, such as low-level or high-level mosaicism, or specify which chromosome was affected. Ask your clinic to explain the exact terms used in your report.

Euploid vs aneuploid: what the difference means for you

An euploid result is generally the outcome patients hope for, because it suggests the embryo has the expected chromosome number. However, euploid embryos can still fail to implant or lead to miscarriage for reasons unrelated to chromosome number. PGT-A cannot detect every possible genetic issue.

An aneuploid result suggests the embryo has an abnormal chromosome number. Many clinics will not recommend transferring these embryos because of the higher chance of implantation failure or miscarriage. Some aneuploid results are linked to specific chromosomes, and your clinic may explain whether the finding is considered full or partial.

It is important to remember that PGT-A is a screening test, not a diagnostic test. A small number of cells may not represent the whole embryo, and laboratories differ in how they report and interpret their findings.

Mosaic embryo transfer in Thailand: what to consider

A mosaic result means the laboratory found a mixture of cells — some with the expected chromosome number and some without. Mosaicism is relatively common in IVF embryos, and its implications are not always clear.

Some clinics may offer the option of transferring a mosaic embryo after counselling, while others may not. There is no single rule that applies to every case. Factors that may be discussed include:

• The proportion of abnormal cells reported (often described as a percentage).
• Which chromosome is involved.
• Whether the mosaic finding is described as low-level or high-level.
• Your own reproductive history and priorities.
• Whether other euploid embryos are available.

If you are considering mosaic embryo transfer in Thailand, ask your clinic about their experience, their counselling process, and what follow-up they recommend. Be cautious of any provider who promises a specific outcome.

Reading a PGT-A report: a practical checklist

Reports from different laboratories can look quite different. When you receive yours, look for these elements:

1. Patient and sample identifiers. Confirm your name, date of birth and the embryo identifiers match your records.
2. Embryo list. Each embryo should have a unique code or number.
3. Result per embryo. Look for terms such as euploid, aneuploid, mosaic or inconclusive.
4. Chromosome details. If aneuploid or mosaic, the report may name the chromosome(s) involved.
5. Mosaic percentage. Some reports include an estimate of the proportion of abnormal cells.
6. Method and limitations. There may be a note about the technology used and its detection limits.
7. Laboratory contact. A name or department you can ask for clarification.

If any part of the report is unclear, ask your clinic for a written explanation or a call with a genetic counsellor. Do not rely on internet forums to interpret your specific result.

Genetic counselling after PGT: what to expect

Genetic counselling is a conversation with a trained professional who can help you understand your results and make decisions that fit your values. In Thailand, availability may vary by clinic, and some clinics work with external counsellors.

During a counselling session, you can expect to discuss:

• What your PGT-A result means in plain language.
• The difference between euploid, aneuploid and mosaic results.
• The limits of PGT-A and what it cannot tell you.
• Possible next steps, including transfer, further testing or another IVF cycle.
• Emotional and practical considerations.

It is reasonable to ask for an interpreter if you do not speak Thai, and to request that key points be put in writing.

Questions to ask your clinic

• Which laboratory performed the PGT-A, and what technology did they use?
• How does your clinic define and report mosaicism?
• What is the policy on transferring mosaic embryos?
• Can I speak with a genetic counsellor before making a decision?
• What are the possible reasons for an inconclusive result?
• If we transfer an embryo, what follow-up testing do you recommend?
• Are there additional costs for counselling or further tests?

Limits and uncertainties

PGT-A is a screening tool. It cannot guarantee a successful pregnancy or a healthy child. Some embryos with normal PGT-A results may still have genetic issues that the test does not detect, and some embryos with abnormal results may occasionally develop normally — this is one reason mosaicism is debated.

Laws and clinic policies about PGT-A, embryo transfer and genetic counselling can change. Always confirm current requirements with your treating clinic and, where relevant, with the appropriate authorities in Thailand.

Next steps

1. Request a copy of your full PGT-A report if you do not already have it.
2. Write down your questions before your next appointment.
3. Ask for a genetic counselling session or a detailed explanation from your clinic.
4. Take time to consider your options; there is rarely a need to decide immediately.
5. Seek a second opinion if you feel uncertain.

For more context on PGT in Thailand, see our PGT in Thailand guide, browse other patient guides, or check our FAQ.

Frequently asked questions

What does a mosaic result on a PGT-A report mean?

A mosaic result means the laboratory found a mixture of cells in the sample — some with the expected number of chromosomes and some without. Mosaicism is relatively common in IVF embryos. The implications depend on factors such as the proportion of abnormal cells and which chromosome is involved. Your clinic or a genetic counsellor can help you understand what it might mean for your situation.

Can a euploid embryo still fail to implant?

Yes. A euploid result means the tested sample showed the expected number of chromosomes, but it does not guarantee that the embryo will implant or lead to a live birth. Many factors affect implantation, including embryo quality, uterine environment and maternal age. PGT-A cannot detect every possible genetic or developmental issue.

Is PGT-A the same as PGT-M or PGT-SR?

No. PGT-A looks at chromosome number across the embryo's chromosomes. PGT-M looks for a specific inherited condition, and PGT-SR looks at structural chromosome rearrangements. Your clinic can explain which test is relevant to your situation.

Should I transfer an aneuploid embryo?

Most clinics do not recommend transferring embryos reported as aneuploid because of the higher chance of implantation failure or miscarriage. However, decisions are individual. Discuss the specific chromosome finding and your options with your treating clinic and, if available, a genetic counsellor.

How do I find a genetic counsellor in Thailand?

Availability of genetic counselling varies by clinic. Ask your treating clinic whether they have a counsellor on staff or can refer you to one. If you do not speak Thai, request an interpreter and ask for key points in writing.

Continue your research

• PGT in Thailand overview
• PGT and IVF guides
• Frequently asked questions

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.