PGT IVF Success Rate Reporting Limitations in Thailand: How to Read Outcome Claims

When comparing PGT IVF success rates from clinics in Thailand, it is important to understand that reported figures are not directly comparable. Success rates depend on patient age, embryo quality, clinic definitions, and the time period measured. A high number may reflect a younger patient group or a different definition of success. This guide explains common limitations in success rate reporting and provides questions to help you interpret claims cautiously.

Why PGT IVF success rates are not one-size-fits-all

PGT (preimplantation genetic testing) is a laboratory procedure used during IVF to examine embryos for chromosomal or genetic conditions. It includes PGT-A (for aneuploidy), PGT-M (for monogenic disorders), and PGT-SR (for structural rearrangements). Success rates after PGT IVF are influenced by many factors, including:

• Patient age and ovarian reserve: Younger patients generally have higher chances of success, but individual results vary widely.
• Embryo quality and quantity: The number of embryos available for testing and transfer affects outcomes.
• Clinic protocols and laboratory expertise: Differences in stimulation, biopsy, and vitrification techniques can influence results.
• Definition of success: Some clinics report positive pregnancy tests, while others report live births. These are very different endpoints.
• Reporting period: Data from different years may reflect changes in technology or patient mix.

Because of these variables, a single percentage cannot predict your individual outcome. Success rates are population-level statistics, not personal guarantees.

Common limitations in success rate reporting

When you see a success rate claim, consider how it was calculated. Common limitations include:

• Selection bias: Clinics may report only on patients with the best prognosis, excluding those with difficult cases.
• Small sample sizes: Rates based on a small number of cycles can fluctuate widely and may not be reliable.
• Different denominators: Some clinics calculate success per cycle started, per egg retrieval, or per embryo transfer. Each gives a different number.
• Multiple pregnancy reporting: Some clinics count a twin pregnancy as one success, others as two.
• Loss to follow-up: If patients move or stop treatment, their outcomes may not be included.
• Time lag: Success rates are often published years after treatment, so they may not reflect current practices.

These limitations mean that a higher number does not necessarily mean better care for you. It may simply reflect a different patient population or reporting method.

How to interpret success rate claims from Thai clinics

When reviewing claims, ask for clarification on the following:

• What is the definition of success? Is it clinical pregnancy, ongoing pregnancy, live birth, or something else?
• What is the denominator? Is it per cycle started, per egg retrieval, or per transfer?
• What is the time period? Which years are included?
• What is the patient profile? Are these rates for all patients or a specific age group?
• Is PGT included? Are these rates for PGT IVF specifically or for all IVF?
• How many cycles are included? A small number can be misleading.
• Are multiple pregnancies counted separately? This affects the reported rate.

If a clinic cannot provide clear answers, treat the claim with caution. Transparency is a good sign of quality care.

Questions to ask a clinic about success rates

Use these questions during consultations to better understand any success rate figures:

1. How do you define a successful outcome? (e.g., live birth, ongoing pregnancy)
2. What is the denominator for your success rate? (e.g., per cycle started, per transfer)
3. What time period do these figures cover?
4. Do these rates include patients with a similar profile to mine?
5. Are these rates for PGT IVF specifically, or for all IVF treatments?
6. How many cycles are included in these figures?
7. How do you handle multiple pregnancies in your reporting?
8. Can you provide data on outcomes for patients in my age group?

Remember that no clinic can guarantee a specific outcome. Success rates are just one factor to consider alongside cost, convenience, and comfort with the care team.

What PGT can and cannot do

PGT can provide information about certain chromosomal or genetic conditions in embryos. It does not guarantee a healthy pregnancy or live birth. Some embryos may be mosaic (having a mix of normal and abnormal cells), and the interpretation of results can be complex. PGT is not necessary for all patients, and its use should be discussed with a qualified healthcare provider based on individual circumstances.

For more information on PGT in Thailand, see our guide at /pgt-in-thailand.

Next steps for international patients

If you are considering PGT IVF in Thailand, take these steps:

• Consult with a reproductive endocrinologist to discuss whether PGT is appropriate for you.
• Ask clinics for detailed success rate data and clarify the definitions used.
• Consider factors beyond success rates, such as communication, support services, and cost transparency.
• Review our general IVF success rates guide at /ivf-success-rates-thailand for more context.
• Explore our /guides section for additional planning resources.
• Check our /faq for answers to common questions.

Remember that your individual outcome depends on many personal factors. Use success rate claims as one piece of information, not as a promise.

Frequently asked questions

Why do PGT IVF success rates vary so much between clinics in Thailand?

Success rates vary because clinics may treat different patient populations, use different definitions of success (e.g., pregnancy vs. live birth), and report over different time periods. Some clinics may also exclude difficult cases or have small sample sizes. Therefore, direct comparisons are often misleading.

Can I trust a clinic's advertised success rate?

Advertised success rates can be informative but should be interpreted with caution. Ask the clinic how they define success, what the denominator is, and which patient groups are included. A transparent clinic will be able to explain their methodology. No success rate can guarantee your individual outcome.

Does PGT improve success rates for all patients?

PGT is not necessary or beneficial for all patients. It may help some patients avoid transferring embryos with certain chromosomal abnormalities, but it does not guarantee a successful pregnancy. Whether PGT is appropriate for you depends on your individual medical history and should be discussed with a qualified healthcare provider.

What questions should I ask a clinic about their success rates?

Ask: How do you define success? What is the denominator (per cycle, per transfer)? What time period is covered? Are these rates for PGT IVF specifically? How many cycles are included? How do you handle multiple pregnancies? Can you provide data for patients with my profile? These questions will help you understand the context of any figures.

Continue your research

• How to interpret IVF success rates
• 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.