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Success Rates

Transparent and proven results

When it comes to choosing a fertility clinic to help build your family, we recognise it’s not only a financial commitment but an emotional one too.

And, when it comes to comparing clinics, it can also be easy to become overwhelmed with data.

We’re really proud of our success rates, so we’ve designed the following page to help you understand what is important to look for when choosing a clinic.

Why we exist

To treat every patient with care and respect.

To understand why our patients either can’t conceive or carry a successful pregnancy, and help them build a family by minimising the number of transfers to get to a live birth.

Setting the scene

We know understanding success rates can sometimes be confusing, so we want to help demystify this part of the fertility journey.

The HFEA have three measures of success: births per embryo transferred, multiple birth rate and births per egg collection (within two years of egg collection).

These are all important factors to understand when choosing a fertility clinic, but what do they mean?

Our data

Our success rates set out below illustrate babies born per embryo transferred – not only because single embryo transfer is ethically the right thing to do, but this is a core focus of the HFEA.

Our highly personalised approach to fertility treatment has resulted in a 47% live birth rate for women under 38, and more than double the national average for babies born for patients aged 38 and older, in each case per embryo transferred.

(All of the following data is for The Evewell Harley Street, from October 2018 (since opening) until December 2021, against the national average for treatments performed in 2018, as reported by the HFEA.)

More than double the national average of babies born for patients aged 38 and older

Our success rates for The Evewell Harley Street show a higher number of babies born per embryo transferred than the national average for 2018.

This is achieved by identifying the embryos that will be most likely to result in a live birth, considering the overall gynaecological health of the mother and transferring as few embryos as possible – a core focus of the HFEA.

Maximising chances

We work hard to give our patients options and choices, minimising pregnancy loss and creating families – both now and in the future.

We don’t select patients based on age or fertility history, and plan as much into the pre-transfer stage to maximise the chances of success, for example: gynaecological investigations and considering adding PGT-A into your treatment plan.

If you have plans for more than one child, your consultant may discuss with you the choice of more than one IVF cycle before considering an embryo transfer, to create options for the future.

Close up of mother and daughter playing after successful fertility treatment

Nearly half of embryos transferred in patients under 40, result in a live birth

The HFEA request that all clinics express their data in ‘under 38’, ‘38 and over’ and ‘all ages’ brackets, but what happens if you’re over 38 and want to know your individual chances?

Whilst we can’t compare smaller age brackets with the national average (as it’s not reported by the HFEA), we have broken down the results for The Evewell Harley Street to illustrate our IVF success rates.

46% of embryos transferred in patients under 40 have resulted in a live birth. And for patients aged between 40 and 42, nearly a quarter of embryos transferred resulted in a live birth.

Ethical, responsible treatment

A multiple pregnancy can be dangerous for the mother and babies, and therefore, transferring a single embryo is considered as best practice by the HFEA

If you’re comparing data for different clinics, it’s very important to ask about a clinic’s multiple birth rate, as transferring multiple embryos can appear to artificially inflate success rates.

Only six multiple births since we opened in 2018

Our multiple birth rate from October 2018 to December 2021 at The Evewell Harley Street is 1.6%, which is lower than the 2018 national average of 8%.

This is because we believe in transferring single embryos, so we can maximise each patient’s chances of achieving a successful pregnancy, whilst minimising pregnancy loss and risk to the mother and baby.

Three out of our six multiple pregnancies have been identical. Identical twin pregnancies occur as a result of a single embryo splitting and therefore can’t be avoided.

Things to consider

There are limitations to all fertility clinics’ success rates, and we recommend that patients use these as a guide only.

Multiple factors, such as personal medical history, will affect any treatment outcomes, therefore it’s important to discuss your individual chances of success with your consultant.

Information on success rates is only one factor when choosing where to seek treatment and comparing fertility clinics. The HFEA’s ‘Choose a Fertility Clinic’ function is a useful source of information. For further information, comparisons using the most recent HFEA data and advice on choosing a clinic, please see the HFEA guidance.

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