How to Read a PGT-A Report from a Thai Laboratory: A Patient Guide

If you have received a PGT-A report from a laboratory in Thailand, you are probably looking at a document full of embryo numbers, technical terms and result categories. This guide explains the common sections you may see, what they generally mean, and why the report should always be discussed with your treating clinician rather than interpreted on its own. It does not tell you what your results mean for your specific situation, and it is not medical advice.

At a glance

• PGT-A is a screening test that looks at the number of chromosomes in an embryo. It is not a diagnostic test for a specific disease and it does not guarantee a pregnancy or a healthy child.
• Reports usually identify each embryo, give a result category, and may include a mosaic call and laboratory notes.
• Result categories are not the same as a treatment plan. Your clinician interprets them alongside your history, the embryo’s development and other factors.
• Ask your clinic which reporting system or terminology the laboratory uses, because wording can differ between laboratories.

What PGT-A is and what it is not

Preimplantation genetic testing for aneuploidy (PGT-A) is a laboratory test performed on a small sample of cells taken from an embryo during IVF. It looks at whether the embryo has the expected number of chromosomes. An embryo with an extra or missing chromosome is described as aneuploid; an embryo with the expected number is described as euploid.

PGT-A is different from PGT-M, which looks for a specific inherited condition, and PGT-SR, which looks at structural chromosome rearrangements. PGT-A does not test for every possible genetic condition, and it does not measure embryo quality in a complete way. It is one piece of information among several that your clinician may consider.

PGT-A is not suitable for everyone and is not a required step in IVF. Whether it is offered or recommended depends on your medical history, your reasons for testing and your clinic’s practice. You can ask your clinician why PGT-A is being suggested in your case and what the alternatives are.

The common sections of a PGT-A report

Laboratory reports vary, but many PGT-A reports from Thai laboratories include the following sections. The exact layout and wording depend on the laboratory.

Patient and sample identification

This section usually confirms the patient name or identifier, the clinic, the date the sample was received, and the type of test performed. Check that your name and identifiers are correct. If anything looks wrong, contact your clinic before drawing conclusions from the report.

Embryo identification

Each embryo is usually given an identifier, such as a number, a code or a combination of letters and numbers. This identifier links the result to the correct embryo in the laboratory and in the clinic’s records. If you have more than one embryo, the report may list them in a table.

Ask your clinic how embryo identifiers are matched to your records, especially if you have embryos stored or if you are planning a transfer. This is a practical safety question, not a sign of doubt.

Result category for each embryo

Most reports give a result category for each embryo. Common categories include:

• Euploid: the expected number of chromosomes was observed in the cells tested.
• Aneuploid: an extra or missing chromosome was observed. The report may name the chromosome involved.
• Mosaic: a mixture of cells with the expected number of chromosomes and cells with an extra or missing chromosome was observed.
• No result or inconclusive: the laboratory could not obtain a clear result from the sample. This can happen for technical reasons.

Some reports use different words or add subcategories. Ask your clinic to explain the exact terms used in your report.

Mosaic calls and what they mean

A mosaic result means the laboratory saw a mix of cells. Mosaicism can be full or partial, and the report may describe the percentage or level of mosaicism. Mosaic results are often described as a separate category because their interpretation is less straightforward than a fully euploid or fully aneuploid result.

Mosaic calls do not automatically mean an embryo should or should not be used. The decision depends on many factors, including which chromosome is involved, the level of mosaicism, your history and your clinic’s approach. This is a discussion to have with your clinician and, if available, a genetic counsellor.

Laboratory notes and limitations

Reports often include notes about the sample, the technology used, the resolution of the test and any limitations. These notes may mention that the test cannot detect every chromosome abnormality, that it does not test for single-gene conditions, or that the result applies only to the cells sampled.

Read these notes as part of the report, not as fine print to skip. They help you understand what the result can and cannot tell you.

A simple way to read the report step by step

1. Check the patient and sample identification. Make sure the report belongs to you and to the correct IVF cycle.
2. Find the embryo identifiers. Match each identifier to the embryo it refers to.
3. Read the result category for each embryo. Note whether the result is euploid, aneuploid, mosaic, or no result.
4. Look for any chromosome details. Some reports name the chromosome or chromosomes involved.
5. Read the laboratory notes and limitations. These explain the scope of the test.
6. Write down your questions before your appointment. Do not make treatment decisions from the report alone.

Questions to ask your clinician about your PGT-A report

• Which reporting system or terminology does this laboratory use, and what do these terms mean in my report?
• How do these results fit with my medical history, my age and the development of each embryo?
• If a result is mosaic, what does the level and the chromosome involved mean for my situation?
• If a result is inconclusive or no result, what are the options, and could the sample be retested?
• What are the alternatives to using PGT-A results in my treatment planning?
• What does PGT-A not tell us about this embryo?
• Who can help me understand the genetic aspects of this report, such as a genetic counsellor?
• What are the next steps, and what decisions need to be made before then?

What PGT-A cannot tell you

PGT-A cannot guarantee that an embryo will implant, that a pregnancy will continue, or that a child will be healthy. It does not test for all genetic conditions. It does not replace prenatal testing or other clinical assessments. A euploid result is not a promise, and an aneuploid or mosaic result is not a complete prediction of what will happen.

Reports are also technical documents. They describe what was observed in a small sample of cells at a particular time. Your clinician is the right person to put that information into context for you.

Practical next steps

• Keep a copy of the full report, including the notes and any attachments.
• Write your questions down and bring them to your next appointment.
• Ask your clinic to explain any term you do not understand, in plain language.
• Ask whether a genetic counselling appointment is available to you.
• Take time before making decisions. You can ask for a follow-up conversation if you need one.

For more general background, you can read our PGT in Thailand overview, browse patient guides, compare hospitals, and check the FAQ for common questions about testing and coordination.

Frequently asked questions

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

A euploid result generally means the laboratory observed the expected number of chromosomes in the cells tested. It does not guarantee implantation, an ongoing pregnancy or a healthy child. Your clinician can explain how this result fits with your overall situation.

What is a mosaic result, and does it mean the embryo cannot be used?

A mosaic result means the laboratory saw a mixture of cells with the expected number of chromosomes and cells with an extra or missing chromosome. It does not automatically mean the embryo cannot be used. The interpretation depends on factors such as the chromosome involved, the level of mosaicism and your medical history, so this is a discussion to have with your clinician.

Why does my report say no result or inconclusive for an embryo?

A no result or inconclusive result usually means the laboratory could not obtain a clear reading from the sample. This can happen for technical reasons. Ask your clinic whether retesting is possible and what the alternatives are.

Can I interpret my PGT-A report without a clinician?

A PGT-A report is a technical laboratory document, and its meaning depends on your medical history and the specific embryos involved. It is best to review it with your treating clinician rather than interpreting it on your own. You can also ask whether genetic counselling is available.

Does PGT-A test for all genetic conditions?

No. PGT-A looks at chromosome number, not at every possible genetic condition. PGT-M and PGT-SR are different tests used for specific inherited conditions or structural chromosome rearrangements. Ask your clinician what your test does and does not cover.

Continue your research

• Thailand hospital directory
• 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.