Understanding success rates
The Human Fertilisation and Embryology Authority (HFEA) provides independent guidance on how IVF success rates should be reported in the UK and how clinic outcomes compare with national averages. We encourage our patients to review independently verified information on the HFEA website to better understand how success rates are calculated and what they mean for different treatment journeys.
In-Ovo is now Thérapie Fertility
Thérapie Fertility recently acquired In-Ovo Fertility Clinic in Belfast and will now be trading as Thérapie Fertility. As we undertake the significant changes required to bring affordable, accessible, and evidence-based care to the North of Ireland, we have shown our success rates for our primary fertility clinic in Dublin. We look forward to being able to publish our new success rates for Belfast. In the meantime, for information on the most current In-Ovo clinic success rates, you can visit the HFEA website.
Success in our Dublin clinic
Assessing our clinical performance is of the upmost importance and it is monitored continuously in Thérapie Fertility. We present a complete data set for our Dublin, Carrickmines laboratory. We will publish updated success rates for our Belfast clinic, as they become available.
Under 35 years
55%
Clinical pregnancies achieved per embryo transfer for Fresh and Frozen Embryos
35–37 years
52%
Clinical pregnancies achieved per embryo transfer for Fresh and Frozen Embryos
38–39 years
42%
Clinical pregnancies achieved per embryo transfer for Fresh and Frozen Embryos
Over 40 years
31%
Clinical pregnancies achieved per embryo transfer for Fresh and Frozen Embryos
55%
All embryo transfers (Dublin)
The following graph depicts our combined data set for all fresh and frozen embryo transfers in our Dublin, Carrickmines clinic from January 2022 to January 2025 in it's entirety. This is benchmarked against the latest data from the HFEA. This is important as we do not exclude any embryo transfer outcomes, and the data presented includes all patients regardless of clinical diagnosis.
- 35%47%
- 44%55%
- 38%52%
- 32%42%
- 21%31%
Fresh embryo transfers (Dublin)
The following graph depicts our combined data set for our fresh embryo transfers in our Dublin, Carrickmines clinic from January 2022 to January 2025 in it's entirety. This is benchmarked against the latest data from the HFEA. This is important as we do not exclude any embryo transfer outcomes, and the data presented includes all patients regardless of clinical diagnosis.
- 31%40%
- 42%55%
- 34%51%
- 26%38%
- 14%24%
Frozen embryo transfers (Dublin)
The following graph depicts our combined data set for our frozen embryo transfers in our Dublin, Carrickmines clinic from January 2022 to January 2025 in it's entirety. This is benchmarked against the latest data from the HFEA. This is important as we do not exclude any embryo transfer outcomes, and the data presented includes all patients regardless of clinical diagnosis.
- 39%48%
- 45%56%
- 41%52%
- 37%44%
- 28%34%
Understanding success rates in IVF can be complicated and unclear. In full transparency, we proudly present the success rates for our Dublin, Carrickmines clinic for the entirety of 2022 to 2025 with no exclusions whatsoever.
What does success look like?
Our clinical pregnancies reported here for our Dublin, Carrickmines clinic, are a direct comparison to the latest data from the HFEA. This is important as we do not exclude any embryo transfer outcomes, and the data presented includes all patients regardless of clinical diagnosis, (PCOS recently renamed as PMOS, endometriosis, diminished ovarian reserve) and semen quality (fresh ejaculate, frozen TESE sperm etc.) Your doctor will provide a unique treatment plan, with your personal predicted change of a live birth. The doctor's assessment will be based on individual relevant factors such as sperm and egg quality, BMI, previous medical and fertility history and testing results. Your doctor will also go through the risks as well as the potential benefits of treatment with you. Be mindful when comparing success rates to other clinics that they may remove subsets of patients or present a particular short period of time in their results (less than 1 year). Other factors are the definition of a pregnancy. Some clinics measure a positive outcome as a positive pregnancy test by urine or blood, rather than a clinical pregnancy determined by ultrasound at 7-8 weeks. That may give a falsely high impression of outcomes. Our success rates are split by age group and fresh and frozen embryo transfers. It's clear to see that with increased maternal age, success rates decrease, however, we are very proud that all our success rates far exceed the HFEA average, across the board. We are also incredibly proud of our outstanding Reciprocal IVF pregnancy rates for same sex female couples, which are 59.5% clinical pregnancy (FHB) per embryo transferred. Our multiple live birth rate is 3.5% which is considered safe practice and in line with the HFEA latest dataset also. Multiple birth is the single biggest risk to the health and welfare of children born after IVF and can be reduced by transferring one embryo at a time to those most at risk of having twins. Human Fertilisation and Embryology Authority. 2023. Human Fertilisation and Embryology Authority Dashboard. Accessed on [2026-05-02].
What these numbers mean
We report clinical pregnancies — confirmed at a 7-8 week scan, not just a positive test. We include every patient and every transfer. No exclusions. That's how we trust the data, and how you can trust it too.
Clinical pregnancy at 7-8 weeks
Confirmed by ultrasound, not a urine or blood test. A higher bar than many clinics report.
Every patient. Every transfer
All ages, all clinical histories, all sperm sources. We don't filter the data to flatter the numbers.
Above HFEA average across all age groups
Compared against the most recent published HFEA dataset (2024). We outperform on every cohort.