PGT for Recurrent Implantation Failure in Thailand: A Cautious Guide

PGT, or preimplantation genetic testing, is sometimes discussed when IVF has not led to implantation after several transfers. It is not a guaranteed solution and it is not automatically right for everyone. PGT can provide extra information about an embryo’s chromosomes or a known inherited condition, but it cannot explain every case of recurrent implantation failure (RIF), and it cannot promise a pregnancy. In Thailand, as elsewhere, the decision should follow an individual medical review rather than a general rule.

At a glance

• RIF is usually defined after repeated transfers of apparently suitable embryos without implantation; definitions vary, so your clinic should explain the one it uses.
• PGT-A looks at chromosome number; PGT-M looks for a known inherited condition; PGT-SR looks at a known structural chromosome rearrangement.
• PGT is one part of a wider fertility review, not a standalone answer.
• Results can be affected by embryo quality, laboratory technique and the limits of the test itself.
• Ask how a result would change your treatment plan before you agree to testing.

What recurrent implantation failure means

Recurrent implantation failure is a working term, not a single diagnosis. It generally describes a situation where several embryos have been transferred in IVF cycles and none has implanted. The exact number of transfers and the type of embryos counted can differ between clinics and studies. Because the definition is not fixed, two clinics may label the same history differently.

RIF is also not the same as recurrent pregnancy loss. RIF concerns implantation; recurrent pregnancy loss concerns pregnancies that begin but do not continue. The two can overlap, but they are assessed differently. If you are unsure which category your history fits, ask your clinic to explain its reasoning in plain language.

What PGT can and cannot show

Preimplantation genetic testing is carried out on a small sample of cells taken from an embryo, usually during an IVF cycle. There are three main types:

• PGT-A (aneuploidy screening) estimates whether an embryo has the expected number of chromosomes. It is the type most often discussed in relation to RIF.
• PGT-M (monogenic disease) looks for a specific inherited condition that is already known in the family.
• PGT-SR (structural rearrangement) looks for chromosome rearrangements that are already known in a parent.

PGT-A does not diagnose the cause of infertility, and it does not measure embryo quality in a complete way. It gives an estimate based on the cells sampled. Some embryos are mosaic, meaning they contain a mix of cells with different chromosome patterns. Mosaic results can be difficult to interpret, and clinics may handle them differently. PGT-M and PGT-SR are used when a specific inherited condition or rearrangement is already identified; they are not general screening tests for RIF.

Why PGT is sometimes considered in RIF

Chromosome errors in embryos are common, and they can affect whether an embryo implants. Because of this, some clinicians discuss PGT-A when a patient has had repeated transfers without implantation. The hope is that selecting embryos with a more typical chromosome pattern may improve the chance of implantation.

However, the evidence is not clear-cut. Studies have reached different conclusions, and the benefit may depend on the patient’s age, the number of embryos available, the clinic’s laboratory, and the reason for the previous failures. PGT-A is not a treatment for RIF; it is a way of gathering information that may or may not change the plan. It also does not address other possible factors, such as the uterine environment, hormonal timing, immune factors, or sperm-related issues.

How PGT fits into a broader RIF review

A thorough review before PGT usually includes:

• A detailed history of previous IVF cycles, including embryo stage, grading, and transfer technique.
• Assessment of the uterine cavity, such as imaging or hysteroscopy, where appropriate.
• Review of hormone levels and the timing of the transfer cycle.
• Discussion of sperm health and any male-factor findings.
• Consideration of genetic testing for the parents if a specific condition is suspected.
• Review of lifestyle, medication, and general health factors that may affect implantation.

PGT may be one part of this review, but it should not replace it. If a clinic suggests PGT without first looking at these other areas, it is reasonable to ask why.

What PGT involves in practice

PGT is performed as part of an IVF cycle. Embryos are created through IVF or ICSI, cultured for a few days, and a small number of cells are removed for testing. The embryos are usually frozen while the results are processed, and a later cycle is used to transfer an embryo. This means PGT adds steps, time, and cost to treatment.

Not every embryo will be suitable for biopsy, and not every embryo will have a result that can be clearly interpreted. Some cycles may end with no embryo available for transfer after testing. These possibilities should be discussed before starting.

Limitations and uncertainties

• PGT-A cannot guarantee a healthy pregnancy or a live birth.
• It does not detect every genetic or chromosomal condition.
• Mosaic results can be uncertain, and policies for transferring mosaic embryos vary.
• Testing may reduce the number of embryos available for transfer.
• The evidence for PGT-A in RIF is mixed, and it may not improve outcomes for every patient.
• PGT does not treat uterine, hormonal, or immune factors that may contribute to RIF.

Because of these limits, PGT should be presented as an option with possible benefits and possible downsides, not as a required step or a promise.

Alternatives and additional considerations

Depending on your history, your clinic may discuss other options alongside or instead of PGT. These can include:

• Further evaluation of the uterus, such as hysteroscopy or endometrial testing.
• Changes to the transfer cycle, such as a different protocol or timing.
• Review of embryo culture and transfer techniques.
• Testing for conditions that may affect implantation, if clinically indicated.
• Consideration of donor eggs or sperm in some situations.
• Supportive care and counselling, since RIF can be emotionally difficult.

No single approach works for everyone. The right plan depends on your individual medical situation, your preferences, and what your clinic can offer.

Questions to ask a clinic in Thailand

If you are considering PGT in Thailand, these questions can help you understand what is being proposed:

• How do you define recurrent implantation failure, and does my history fit that definition?
• What other assessments do you recommend before PGT?
• Which type of PGT are you suggesting, and why?
• What are the possible results, including uncertain or mosaic results, and how would each affect my plan?
• What happens if no embryo is available for transfer after testing?
• What are the costs involved, including testing, freezing, storage, and the transfer cycle?
• What are the success rates for patients with a similar history at your clinic, and how are those rates measured?
• What are the alternatives if I decide not to have PGT?
• Who will explain the results to me, and what support is available?

Practical next steps

1. Gather your previous IVF records, including embryo reports and transfer notes.
2. Ask your current or prospective clinic to review your history and explain whether PGT is likely to change your care.
3. Request a clear written summary of the proposed plan, including tests, timelines, and costs.
4. Consider a second opinion if you feel unsure or if PGT is presented as the only option.
5. Take time to weigh the possible benefits and burdens with your partner or support person.

PGT may be helpful for some patients with RIF, but it is not a cure and not a guarantee. The most useful step is a careful, individual discussion with a qualified fertility specialist who can review your full history and explain the uncertainties honestly.

Frequently asked questions

Does PGT improve the chance of pregnancy in recurrent implantation failure?

The evidence is mixed. Some studies suggest PGT-A may help in certain situations, while others do not show a clear benefit. Whether it helps depends on individual factors such as age, embryo number, and the reason for previous failures. It is not a guaranteed solution.

Is PGT always recommended for recurrent implantation failure?

No. PGT is one option among several. Guidelines do not universally recommend it for RIF, and the decision should be based on your individual medical history and a discussion with your specialist.

What is the difference between PGT-A, PGT-M, and PGT-SR?

PGT-A estimates chromosome number in an embryo. PGT-M looks for a specific inherited condition that is already known in the family. PGT-SR looks for a known structural chromosome rearrangement. PGT-M and PGT-SR are used when a specific condition or rearrangement has been identified.

Can PGT guarantee a healthy baby?

No. PGT can provide information about certain chromosome or genetic features, but it cannot guarantee a healthy pregnancy or baby. It does not detect every possible condition, and some results can be uncertain.

What should I ask a clinic in Thailand about PGT for RIF?

Ask how they define RIF, which type of PGT they recommend and why, what other assessments they suggest, how they handle uncertain results, what the costs are, and what alternatives exist if you decide not to have PGT.

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.