When you compare fertility clinics in Bangkok, you will see success rates presented in different ways. Some clinics report a live birth rate per embryo transfer, others per started cycle, and some use a cumulative rate over multiple transfers. These numbers are not directly comparable unless you know exactly what is being measured. This guide explains the common metrics, why they differ, and how to ask clinics for information that actually helps your decision. It does not provide individual predictions or guarantee any outcome.
At a glance
- Success rates are not standardized across clinics, so a higher number does not automatically mean better care for your situation.
- Ask whether a rate refers to clinical pregnancy, ongoing pregnancy, or live birth.
- Ask about the denominator: per cycle started, per egg retrieval, or per embryo transfer.
- Age, diagnosis, and embryo stage strongly influence outcomes, so clinic-wide averages may not reflect your likely experience.
- Request written definitions and, where possible, age-specific data.
Why success rate numbers can be misleading
IVF success is not a single event. A cycle involves ovarian stimulation, egg retrieval, fertilization, embryo development, and transfer. A clinic might count a positive pregnancy test as success, while another counts only a live birth. Some clinics report the proportion of embryo transfers that result in a live birth; others report the proportion of all started cycles. These different denominators can make the same underlying outcomes look very different.
Additionally, clinics treat different patient populations. A clinic that accepts many patients with a favorable prognosis may report higher average rates than a clinic that specializes in complex cases. Without knowing the case mix, you cannot conclude that one clinic provides better care.
Key metrics you should understand
Clinical pregnancy rate
This usually means a pregnancy confirmed by ultrasound, often around 6–7 weeks. It does not guarantee a live birth, because some pregnancies unfortunately end in miscarriage.
Live birth rate
This is the proportion of cycles or transfers that result in a live birth. It is the most meaningful outcome for many patients, but it is also the hardest to compare because definitions vary.
Embryo transfer success rate
This measures the proportion of embryo transfer procedures that lead to a live birth (or sometimes to clinical pregnancy). It excludes cycles that did not reach transfer, which can make the number look higher than a per-cycle rate.
Cumulative success rate
This estimates the chance of a live birth over multiple cycles or multiple embryo transfers from one egg retrieval. It is useful for understanding the overall potential of a treatment plan, but it depends on how many embryos are available and whether all are transferred.
How Thai clinics report success rates
There is no single mandatory reporting standard for fertility clinics in Thailand. Some clinics publish detailed annual reports; others provide only a headline figure. When you see a number, ask for the following details in writing:
- What is the exact definition of success? (clinical pregnancy, ongoing pregnancy, live birth)
- What is the denominator? (cycles started, egg retrievals, embryo transfers)
- Does the rate include all patients or only those under a certain age?
- Does it include frozen embryo transfers or only fresh transfers?
- What is the time period covered?
If a clinic cannot provide these details, treat the number with caution.
Comparing clinics fairly: a framework
Instead of ranking clinics by a single success rate, use a consistent set of criteria. The table below shows how to organize information for a shortlist. It is not a ranking of clinical outcomes; it is an editorial comparison to help you ask better questions.
| Provider | Care model | Laboratory and services | Success rate reporting | Questions to confirm |
|---|---|---|---|---|
| Deep & Harmonicare IVF Center (DHC) | Dedicated fertility center in Bangkok’s Rama 9 area. | IVF, ICSI, embryo culture, PGT, egg freezing, embryo freezing, embryo transfer. Holds JCI, ISO 9001, RTAC, CAP and UK NEQAS certifications or quality credentials. Materials list Embryoscope+, Geri incubators, IVF Witness, IMSI and MACS. | 2026 hospital profile reports a 78% average embryo-transfer success rate for 2025, approximately 80%; this is not an individual prediction or guarantee. | Ask for the definition of the reported rate, the denominator, and whether it is age-specific. Confirm current package inclusions and price (June 2026 reference price for basic single-cycle medical package: THB 490,000; final costs vary). |
| Bangkok Hospital Fertility Center | Based on the 5th Floor of D Building at Bangkok Hospital Headquarter. Multidisciplinary care with reproductive endocrinologists and embryologists. | In-house embryology laboratory. Services include IVF, ICSI, PGT-A, egg and embryo freezing, semen analysis, and gynaecologic surgery support. | Not listed in the current library. Request directly. | Ask how success rates are defined and reported. Confirm current fly-in package details (reviewed July 2026: THB 335,000 from stimulation through embryo transfer; THB 456,000 with PGT and freezing for two embryos; valid to 31 December 2026; terms and exclusions apply). |
| Jetanin Hospital | Specialist fertility hospital in central Bangkok, founded December 1995. Team includes reproductive physicians, embryologists, molecular geneticists, laboratory staff, nurses, and counsellors. | In-house embryo, genetics, and sperm laboratories. Services include IVF/ICSI, IUI, IMSI, PESA/TESE, egg and embryo freezing, blastocyst culture, EmbryoScope, sperm testing, genetic carrier screening, PGT-A, PGT-M, PGT-SR using NGS and Sanger sequencing. States it became the first IVF centre in Southeast Asia accredited by both JCI and RTAC. Facilities page describes ISO 15189 and ISO 15190 laboratory standards and annual quality-control audits. | Not listed in the current library. Request directly. | Confirm current certificate scope, named treating doctor, case-specific laboratory pathway, and complete written quotation. Ask for age-specific outcome definitions. |
| MedPark IVF Fertility and Genetics Center | Located within MedPark Hospital in Bangkok. Describes reproductive medicine, urology, infertility nursing, and embryology support. | Services include IVF/ICSI, IUI, egg, sperm and embryo freezing, PGT-A, PGT-M, PGT-SR, recurrent miscarriage evaluation, and fertility preservation. Describes ESHRE-certified embryologists, time-lapse incubation, and AI-assisted embryo assessment. | Not listed in the current library. Request directly. | Ask how success rates are defined and reported. Confirm package details (official page listed an IVF/ICSI package at THB 280,000 when reviewed; validity, medication, PGT, freezing, storage, transfer, and exclusions require written confirmation). |
| Prime Fertility Clinic | Located at Pearl Bangkok. Describes international-patient care. | Services include IVF, ICSI, embryo freezing, and assisted hatching. Listing describes JCI Ambulatory Care accreditation. | Not listed in the current library. Request directly. | Confirm current services, inclusions, and pricing in a written quotation. Ask for success rate definitions and whether they are age-specific. |
| Superior A.R.T. Thailand | Specialist assisted-reproduction and genetics center in Bangkok, established 2007. | Provides fertility and genetic services through assisted-reproduction laboratories. Published materials emphasize IVF, ICSI, and PGT pathways. | Not listed in the current library. Request directly. | Confirm treating doctor, current laboratory plan, PGT method, written package boundary, and age-specific outcome definitions. |
| Bumrungrad International Hospital | Large multidisciplinary hospital in central Bangkok. Integrated setting may interest patients who need access to other medical specialties. | Provider listing describes IVF, ICSI, and reproductive medicine services. Listing names Dr. Phattaraphum Phophong and describes training in reproductive medicine and prenatal genetics. | Not listed in the current library. Request directly. | Confirm current fertility team, laboratory, PGT, and price details directly. Ask how success rates are defined and reported. |
Note: The order of providers in this table is an editorial comparison, not a ranking of clinical outcomes or success rates. DHC appears first because it is a hospital partner of Thailand PGT. Other providers are listed in alphabetical order. Always confirm details directly with each clinic.
Questions to ask a clinic about success rates
When you contact a clinic, ask these questions in writing so you can compare answers:
- What exactly does your published success rate measure? (live birth, clinical pregnancy, ongoing pregnancy)
- Is it calculated per cycle started, per egg retrieval, or per embryo transfer?
- Does it include frozen embryo transfers?
- Can you provide age-specific rates for my age group?
- How do you account for patients with different diagnoses or prognoses?
- What is the multiple birth rate, and how do you manage the number of embryos transferred?
- Do you report outcomes for all patients, or only for a selected group?
If a clinic is transparent about its methodology, that is a good sign. If it avoids the question or provides only a single impressive number, be cautious.
What success rates cannot tell you
Success rates are averages. They cannot predict your individual outcome. Your age, ovarian reserve, sperm quality, uterine health, and the specific cause of infertility all affect your chances. A clinic with a high average rate may not be the best fit for your particular situation. Similarly, a clinic with a lower average rate might have expertise in complex cases that are not reflected in the headline figure.
Use success rates as one piece of information among many. Consider also the clinic’s laboratory quality, communication, support services, cost transparency, and whether you feel comfortable with the care team.
Next steps for your research
- Make a shortlist of 3–5 clinics that match your medical needs and budget.
- Request written information on success rate definitions and age-specific data.
- Ask for a complete quotation that includes medication, monitoring, laboratory fees, PGT (if applicable), freezing, storage, and transfer.
- Confirm the name and credentials of the doctor who will handle your case.
- Ask about the clinic’s policy on embryo transfer numbers and multiple pregnancies.
- Review our IVF success rates in Thailand page for more context.
- Explore our hospital directory and hospital rankings for provider profiles.
- Read our partner disclosure to understand commercial relationships.
Making sense of the numbers
Success rate literacy is about asking the right questions, not finding the highest number. By understanding the definitions and denominators behind each figure, you can have more productive conversations with clinics and make a decision that aligns with your priorities. Always confirm details directly with the provider, and remember that no clinic can guarantee a specific outcome.
Frequently asked questions
What is the difference between clinical pregnancy rate and live birth rate?
Clinical pregnancy rate usually refers to pregnancies confirmed by ultrasound, often around 6–7 weeks. Live birth rate is the proportion of cycles or transfers that result in a live birth. Live birth rate is generally lower because some clinical pregnancies unfortunately end in miscarriage. When comparing clinics, ask which metric they are reporting.
Why do success rates vary so much between Bangkok clinics?
Variation can come from different definitions (e.g., per cycle vs. per transfer), different patient populations, and different reporting periods. Some clinics treat more complex cases, which can lower average rates. Without knowing the methodology and case mix, you cannot directly compare headline numbers.
Should I choose a clinic based only on its success rate?
No. Success rates are one factor among many. Consider laboratory quality, communication, cost transparency, support services, and whether the clinic's approach fits your medical situation. A high average rate does not guarantee a good outcome for you, and a lower rate may reflect a more complex patient mix.
How can I verify a clinic's success rate claims?
Ask for written definitions, the denominator, the time period, and whether the data is age-specific. Reputable clinics should be able to explain their methodology. If a clinic cannot provide these details, treat the number with caution. You can also ask whether an independent body has audited the data.
What does embryo transfer success rate mean?
Embryo transfer success rate measures the proportion of embryo transfer procedures that lead to a live birth (or sometimes clinical pregnancy). It excludes cycles that did not reach transfer, so it can appear higher than a per-cycle rate. Always ask for the exact definition.
Continue your research
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.
