PGT-M Testing in Thailand: Referral, Counselling and Lab Pathway Questions

PGT-M (preimplantation genetic testing for monogenic conditions) is a specialised pathway, not a single test you can simply book. In Thailand, as elsewhere, it usually begins with a confirmed genetic diagnosis in your family, then moves through genetic counselling, test development in a genetics laboratory, IVF, embryo biopsy and analysis. The exact sequence, timeline and documents depend on your clinic and laboratory, so treat the steps below as a map of questions to confirm, not a fixed protocol.

At a glance

• PGT-M is considered when a specific inherited condition has been identified in your family and a suitable genetic variant can be tested.
• Genetic counselling comes before test development, not after.
• A laboratory usually needs to build and validate a custom test for your family before IVF starts.
• Referral pathways, waiting times, costs and document requirements vary and should be confirmed directly.
• PGT-M reduces, but does not eliminate, the chance of passing on a condition, and it does not guarantee a pregnancy.

What PGT-M is and what it is not

PGT-M looks at embryos created through IVF to identify those that have inherited a specific genetic variant associated with a known monogenic condition. It is different from PGT-A, which screens for chromosome number, and from PGT-SR, which relates to structural chromosome rearrangements. Each test answers a different question, and not every patient needs every test.

PGT-M is not a guarantee. It cannot ensure a pregnancy, a live birth or a healthy child, and it does not replace diagnostic testing during pregnancy if that is recommended. It also cannot detect every possible genetic or health issue. Your clinical team can explain what the test can and cannot show in your specific situation.

Step 1: Confirming the genetic diagnosis and referral

The starting point is usually a known genetic variant in your family. This may come from a previous genetic test on you, your partner, an affected child or another relative. Without a confirmed variant, a laboratory may not be able to design a PGT-M test.

A referral to a clinical genetics service or a fertility clinic with genetics support is typically the next step. In some cases, your existing specialist, such as a neurologist, haematologist or paediatrician, can help initiate this. The referral may involve sharing genetic test reports, family history and relevant medical records.

Questions to ask at this stage:

• Which specific gene and variant would be tested?
• Is the variant well characterised enough for a laboratory to build a test?
• Do we need additional genetic testing before PGT-M can be considered?
• Who will coordinate the referral, and what records do they need from us?

Step 2: Genetic counselling before PGT-M

Genetic counselling is a core part of the pathway. A genetic counsellor or clinical geneticist can explain inheritance patterns, the chance of passing on the condition, the limitations of PGT-M and the alternatives. Alternatives may include accepting the natural chance, using donor gametes, prenatal diagnosis, or choosing not to pursue testing. These are personal decisions, and counselling is designed to support them without pressure.

Counselling may also cover practical and emotional aspects: what happens if no unaffected embryos are available, how results are reported, and what follow-up testing may be offered during pregnancy.

Questions to ask during counselling:

• What is the inheritance pattern in our case, and what does that mean for our options?
• What are the alternatives to PGT-M, and what are their limitations?
• What is the chance that no suitable embryo will be available for transfer?
• What support is available if we decide not to proceed?

Step 3: Test development and laboratory coordination

PGT-M usually requires a custom laboratory test built around your family’s specific variant. This is often called test development or validation. The laboratory may need DNA samples from you, your partner and sometimes an affected or unaffected relative to establish a reliable test. The exact samples required depend on the condition and the laboratory’s protocol.

This step can take time, and it happens before or alongside IVF preparation. The laboratory and clinic need to coordinate closely so that the test is ready when embryos are biopsied.

Questions to ask about the laboratory pathway:

• Which laboratory will perform the PGT-M analysis, and how does it communicate with the clinic?
• What samples are needed from us or our relatives, and how are they shipped?
• How long does test development usually take in our case?
• What happens if the test cannot be developed or validated?
• How are results reported, and who explains them to us?

Step 4: IVF, embryo biopsy and analysis

If you proceed, the next stage is IVF, which involves ovarian stimulation, egg retrieval, fertilisation and embryo culture. At a suitable stage, a small number of cells are removed from each embryo for analysis. This is a laboratory procedure, and not all embryos may be suitable for biopsy or testing.

The PGT-M result indicates whether a tested embryo has inherited the variant in question. It does not guarantee that an embryo will implant or develop into a healthy child. Your clinic will discuss which embryos may be considered for transfer and what follow-up is recommended.

Step 5: Results, transfer and follow-up

After analysis, your clinical team will explain the results and discuss transfer options. In some cycles, no unaffected embryos may be available. If a transfer is planned, the clinic may also discuss additional testing during pregnancy, such as chorionic villus sampling or amniocentesis, to confirm the result. These are decisions to make with your clinician.

Practical questions to ask any clinic

• Does the clinic work with a genetics laboratory experienced in PGT-M for our condition?
• Who provides genetic counselling, and is it included in the pathway?
• What is the typical sequence and approximate timeline from referral to transfer?
• What costs are involved at each stage, and what is not included?
• What documents do we need to provide, and are there any legal or regulatory requirements we should confirm?
• How are our data and genetic samples stored and used?

Next-step checklist

1. Gather your genetic test reports and family history details.
2. Ask your treating specialist for a referral to a clinical genetics or fertility service.
3. Arrange genetic counselling before committing to test development.
4. Confirm which laboratory will build the test and what samples are needed.
5. Ask for a written outline of the pathway, including costs and timelines.
6. Confirm document, travel and legal requirements with the clinic and relevant authorities.

You can explore hospitals, read more about PGT in Thailand, browse our guides, or check the FAQ for general orientation. For personal decisions, speak with a qualified clinician who knows your medical history.

Frequently asked questions

Do I need a confirmed genetic diagnosis before considering PGT-M in Thailand?

In most cases, yes. PGT-M is designed around a specific genetic variant, so a laboratory usually needs a confirmed variant in your family to build a test. If no variant has been identified, your clinician may first recommend genetic testing or referral to a clinical genetics service. The exact requirements depend on your situation and the laboratory.

Is genetic counselling required before PGT-M?

Genetic counselling is generally considered an important part of the pathway. It helps you understand inheritance, the limitations of PGT-M, alternatives and possible outcomes. Requirements vary by clinic and country, so confirm with your treating team what is expected in your case.

How long does the PGT-M laboratory pathway take?

Timelines vary widely depending on the condition, the laboratory and whether additional family samples are needed. Test development can take weeks or longer, and it usually happens before or alongside IVF preparation. Ask your clinic for an estimate based on your specific case.

Does PGT-M guarantee a healthy baby?

No. PGT-M can identify embryos that have inherited a specific variant, but it cannot guarantee a pregnancy, a live birth or a child without any health issues. It also cannot detect every possible genetic or health condition. Your clinical team can explain what the test can and cannot show in your situation.

What should I ask a clinic about PGT-M costs and documents?

Ask for a written breakdown of costs at each stage, including genetic counselling, test development, IVF, biopsy, analysis and transfer. Also ask which documents are required and whether there are any legal or regulatory steps to confirm with the relevant authorities. These details vary and should be confirmed directly.

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.