Author: Dr Irfana Koita | Published: 1 March 2026
Choosing a fertility clinic is one of the most important decisions you will make during your IVF journey. With time, finances and emotions invested in treatment, it is natural to compare IVF success rates in London before deciding where to seek care.
The Human Fertilisation and Embryology Authority (HFEA) publishes fertility treatment data from licensed clinics across the UK. Its statistics provide valuable information about treatment outcomes and give patients a national benchmark when researching IVF.
However, there is an important distinction between a national average and an individual clinic's results.
An HFEA national average combines outcomes from different clinics, patient groups and treatment circumstances. A clinic's published results may relate to a specific age group, treatment type or reporting period. Looking at these figures without understanding their context can therefore give an incomplete picture.
So, when comparing IVF clinic success rates, what should you actually look at?
In this guide, we explain how to interpret HFEA data, why clinic results can differ from national averages, why age and live birth rates matter, what frozen embryo transfer results can tell you, and how to compare fertility clinics in London more effectively.
Thinking about IVF treatment? Book a FREE Advisory Call with IVF Matters to discuss your fertility options and understand the next steps for your individual circumstances.
HFEA IVF Success Rates: What Does the National Average Actually Mean?
The HFEA collects and publishes fertility treatment data from licensed fertility clinics in the UK. Its statistics cover areas including IVF, frozen embryo transfer, patient age and treatment outcomes.
For people researching IVF success rates London, this information is an important starting point. It provides a national reference that allows patients to put individual clinic results into a wider context.
However, a national average is not the result of one clinic.
It combines data from different clinics treating patients with different ages, fertility histories, diagnoses and treatment requirements.
National data can therefore include:
- NHS and private fertility clinics
- High-volume and lower-volume centres
- Different patient age groups
- Patients with different fertility diagnoses
- Different treatment histories
- Clinics treating more complex cases
This matters because IVF outcomes can be influenced by many factors, and the patients treated at one clinic may not be identical to those treated elsewhere.
A National Average Is Not an Individual Prediction
Suppose a national statistic shows a particular live birth rate. It does not mean that every patient undergoing IVF has exactly that chance of success.
An individual outcome may be influenced by factors such as age, ovarian reserve, fertility diagnosis, previous treatment, sperm factors, embryo development and the type of embryo transfer being undertaken.
This is why HFEA data is most useful as a benchmark, rather than as a prediction of what will happen in an individual treatment cycle.
Why Do IVF Clinic Success Rates Differ?
If two fertility clinics report different success rates, there may be several reasons.
The difference does not automatically mean that one set of data is more accurate. Instead, it is important to understand what is behind each percentage.
1. Patient Characteristics and Treatment Approach
Fertility clinics do not all treat the same patient population.
A clinic may see more patients in a particular age group, more patients undergoing their first IVF cycle, or a larger number of patients with complex fertility histories.
Treatment plans can also vary according to individual circumstances.
A personalised approach may include:
- Individual medication protocols
- Careful monitoring during stimulation
- Assessment of ovarian response
- Embryo assessment
- Decisions around fresh or frozen transfer
- Treatment planning based on previous outcomes
These differences can affect the outcomes reported by individual clinics.
When comparing IVF clinic success rates, it is therefore worth asking whether the figures relate to a patient group and treatment type similar to your own circumstances.
2. Embryology and Laboratory Expertise
The IVF laboratory is an essential part of fertility treatment.
After egg collection and fertilisation, embryos need to be cultured and assessed. If embryos are frozen, they also need to be stored and subsequently thawed before transfer.
Laboratory processes can include:
- Embryo culture systems
- Embryo assessment
- Freezing and thawing protocols
- Vitrification
- Time-lapse imaging where used
- Quality-control procedures
These processes are particularly relevant when considering a frozen embryo transfer success rate.
Patients comparing clinics should therefore consider laboratory and embryology information alongside headline success rates.
3. Results Can Change Over Time
IVF outcomes can fluctuate from one year to another.
Changes in patient numbers, patient characteristics, treatment types and individual clinical circumstances can all contribute to differences in annual results.
This is why looking at a longer reporting period can provide more context than focusing on one year's percentage.
When reviewing clinic data, ask:
- How many years does the result cover?
- Is it a single-year figure or a multi-year average?
- Is the same outcome being measured?
- Are age groups identified?
- Are fresh and frozen treatments reported separately?
Understanding the period behind a statistic helps prevent a single year's result from being taken out of context.
How to Read an IVF Clinic Success Rate
A percentage on a fertility clinic website can look straightforward, but several questions should be answered before comparing it with another percentage.
What Outcome Is Being Measured?
A clinic may report:
- Pregnancy rate
- Clinical pregnancy rate
- Implantation rate
- Live birth rate
These are different measures and should not be treated as interchangeable.
Which Patients Are Included?
Check the age range and other relevant characteristics of the patient group.
An overall clinic figure may be less useful than an age-specific result when you are trying to understand your own circumstances.
What Treatment Is Included?
Fresh embryo transfer and frozen embryo transfer are different treatment pathways.
If you are specifically considering FET, an overall IVF percentage may not tell you as much as the clinic's FET-specific results.
What Period Does the Data Cover?
A result from one year may fluctuate. Multi-year results can provide additional context when assessing reported outcomes.
What Is the Percentage Calculated From?
Always check whether the figure is reported per embryo transferred, per treatment cycle, per patient or using another measure.
Two percentages cannot be meaningfully compared if they are based on different measurements.
IVF Matters vs HFEA National Averages
For patients aged 30–43, the following figures represent a three-year average covering 2022–2024.
IVF Treatment — Live Birth Rate
| Measure | Live Birth Rate |
| IVF Matters | 47% |
| HFEA National Average | 25% |
Frozen Embryo Transfer — Live Birth Rate
| Measure | Live Birth Rate |
| IVF Matters | 50% |
| HFEA National Average | 33% |
These figures show that the reported IVF Matters live birth rates for patients aged 30–43 were above the corresponding HFEA national averages for IVF treatment and frozen embryo transfer during the stated period.
However, the figures should be interpreted within their defined patient group and reporting period. They should not be treated as a guarantee of an individual patient's outcome.
This is an important point when comparing IVF success rates in London: the context behind the percentage matters just as much as the percentage itself.
IVF Success Rate by Age: Why Age Should Be Part of the Comparison
Age is one of the important factors to consider when researching IVF outcomes.
The IVF success rate by age can vary considerably, which is why national and clinic-specific figures are often presented according to different age groups.
An overall clinic success rate can sometimes hide differences between patient groups.
For example, two clinics could have different overall results because their patient populations have different age profiles. Comparing the headline percentages alone would not explain that difference.
When looking at success rates, consider whether the data is relevant to your age group.
Other factors can also influence treatment outcomes, including:
- Ovarian reserve
- Fertility diagnosis
- Previous IVF treatment
- Sperm factors
- Embryo development
- Previous pregnancy history
- Fresh or frozen embryo transfer
Age is therefore an important part of understanding IVF outcomes, but it is only one part of an individual treatment assessment.
Frozen Embryo Transfer Success Rate: Why FET Results Matter
Frozen embryo transfer has become an important part of modern IVF treatment.
During FET, an embryo that was previously frozen is thawed and transferred during a later treatment cycle. This can involve several stages, including embryo storage, thawing, preparation of the endometrium and timing of the transfer.
The frozen embryo transfer success rate can therefore provide useful information when comparing clinics, particularly if frozen embryos are likely to form part of your treatment plan.
For patients aged 30–43, IVF Matters reported a 50% live birth rate for frozen embryo transfer across the 2022–2024 period, compared with an HFEA national average of 33%.
The figure should still be viewed in context. FET outcomes can depend on factors including patient characteristics, embryo quality and the circumstances surrounding the treatment cycle.
For this reason, FET-specific data can be more informative than relying solely on an overall IVF success rate.
What Should You Look For When Choosing an IVF Clinic in London?
Searching for the best IVF clinic in London can provide access to a wide range of clinics, treatment options and published statistics.
Instead of focusing on one headline percentage, consider the wider picture.
Look for Transparent Success Rates
A clinic should make it clear what its figures represent.
Check the age group, treatment type, outcome measure and reporting period.
Compare Like With Like
If you compare two clinics, make sure the figures are measuring the same outcome.
A live birth rate should not be directly compared with a pregnancy rate, and a frozen transfer result should not automatically be compared with an overall IVF figure.
Consider Personalised Treatment
Ask how treatment is adapted to individual circumstances rather than following a standard approach for every patient.
Understand Laboratory Care
Embryology is a key part of IVF. Ask about embryo culture, assessment, freezing, thawing and laboratory quality-control processes.
Consider the Overall Patient Experience
Success rates are important, but so are communication, clinical support, treatment planning and understanding the total cost of treatment.
The right clinic for one patient may not necessarily be the right clinic for another. The most useful approach is to assess the available evidence alongside your own circumstances.
Why HFEA Data Still Matters
Clinic-specific success rates can provide valuable additional information, but HFEA data remains an important reference.
The HFEA provides national fertility treatment statistics and regulates licensed fertility clinics in the UK. Its published data creates a consistent national reference point for patients researching treatment.
The two sources of information therefore serve different purposes.
HFEA data provides the national benchmark.
Clinic-specific data provides information about an individual clinic's reported outcomes.
Using both can help patients understand where a clinic's published figures sit within the wider UK fertility treatment landscape.
Making an Informed Decision About IVF Treatment
Success rates can help you compare fertility clinics, but a percentage should never be viewed in isolation.
When researching IVF success rates in London, consider:
- The patient's age group
- Live birth rate
- Treatment type
- Reporting period
- Patient characteristics
- Embryology and laboratory processes
- Personalised treatment planning
- The wider level of clinical support
For IVF Matters, the reported figures for patients aged 30–43 during 2022–2024 were 47% for IVF treatment and 50% for frozen embryo transfer, compared with HFEA national averages of 25% and 33% respectively.
These results provide a useful comparison with national benchmarks, while recognising that individual outcomes can vary.
Ultimately, understanding what a success rate measures is just as important as the number itself.
Take the Next Step
Choosing a fertility clinic is a personal decision, and understanding success rates is an important part of researching your options.
If you are considering IVF in London and want to understand your treatment options, how success rates relate to your circumstances, or what treatment at IVF Matters involves, our team is here to help.
Call us today on 03339399951, to find out more or schedule your FREE Advisory Call.
