Egg freezing has gone from a niche procedure to a genuinely mainstream part of UK fertility treatment over the past five years. Human Fertilisation and Embryology Authority (HFEA) figures show cycles rose from 2,567 in 2019 to 6,932 in 2023, an increase of more than 170% in four years. That momentum carried into 2024, when egg freezing accounted for around 7% of all fertility treatment cycles nationally, although the HFEA notes it was the first year without an increase since 2020, a sign the boom may finally be levelling off.
The growth is concentrated among a specific cohort. HFEA data shows the biggest rise has come from women aged 30 to 37, rather than the older patients egg freezing is sometimes stereotyped as being for. It reflects freezing increasingly being used earlier, while fertility is comparatively strong, rather than as a last resort once other options have narrowed.
That timing gap is where the real story sits, though. HFEA data puts the average age at freezing at 35, but the average age at thawing, when people actually come back to try to use the eggs, sits at 40. That five-year gap matters, because egg quality and the odds of a successful outcome from frozen eggs both decline with age, and the HFEA has flagged a genuine concern underneath the freezing boom: the number of people actually returning to use their frozen eggs remains far lower than the number putting them into storage in the first place.
Two things sit behind that. Some people freeze speculatively as an insurance policy they never end up needing, and others go on to conceive naturally or via a different route. But it’s also true that plenty of people who freeze don’t get clear guidance at the time about what their frozen eggs actually represent statistically, and end up either overestimating how much protection they’ve bought themselves, or leaving it too long before deciding whether or how to use them.
None of this is a reason not to freeze eggs. It’s a case for treating the decision as more than a one-off procedure booked in isolation. Egg freezing outcomes are driven overwhelmingly by age at the point of freezing and by ovarian reserve at that moment, both things a Fertility Assessments appointment is specifically designed to establish before anyone commits to a cycle, rather than working it out after the fact from a national average.
With NHS funding unavailable for non-medical egg freezing (only around 15% of cycles between 2018 and 2022 were funded on medical grounds) and cycles now running into the thousands each year, going in with a realistic, individual picture is what actually determines whether the eggs in storage end up meaning anything later.
ENDS