IVF Success Rates by Age UK (2026)

Key Takeaways

UK IVF success rates drop sharply with age. Based on the latest HFEA published data, the live birth rate per embryo transferred for women using their own eggs is approximately: 32% under 35, 25% at 35–37, 19% at 38–39, 11% at 40–42, and 5% at 43–44
Cumulative success rates (across 3 cycles) tell a much more positive story — around 55–65% for women under 35, falling to 10–15% for women over 42
Donor egg IVF success rates are largely independent of the recipient's age — around 40–50% live birth per transfer at all ages, because success tracks the donor's age, not the recipient's
ICSI success rates are broadly equivalent to standard IVF when used for male-factor infertility — it is not a general "upgrade" for better odds
HFEA data is reported per embryo transfer, per egg collection, and per cycle started — these numbers differ, and clinics sometimes quote the most flattering one. Our figures below are per embryo transferred unless stated
"Success rate" varies between clinics by more than age does. Two clinics in the same city can report double-digit differences at the same age band — our clinic comparison tool lets you see side-by-side

What Counts as an "IVF Success Rate"?

Before the numbers, the definitions — because the same clinic can legitimately quote three very different percentages depending on what denominator they use.

Metric	What It Means	Why It Matters
Live birth per embryo transferred	Proportion of embryo transfers that result in a live birth	The most common headline number. Flattering if a clinic only transfers when embryos look strong
Live birth per egg collection	Proportion of egg collection procedures that result in a live birth	More conservative — counts cycles where no embryos were transferred
Live birth per cycle started	Proportion of cycles begun that result in a live birth	Most honest — counts cycles that were cancelled before egg collection
Clinical pregnancy rate	Proportion with a detectable pregnancy on ultrasound	Higher than live birth rate because it doesn't account for miscarriage
Cumulative live birth rate	Proportion who achieve a live birth across multiple cycles	The number that actually matters for most couples planning treatment

The HFEA publishes all of these. Individual clinics have to report under a standardised format, which is why their websites usually show "live birth rate per embryo transferred" — but you are entitled to ask for any of the above.

What to ask your clinic: "What is your live birth rate per cycle started, for women in my age group, using their own eggs, in the last reporting period?" That's the fair comparison.

UK IVF Success Rates by Age — Using Your Own Eggs

The table below reflects the most recent HFEA published data for women using their own eggs and their partner's sperm (no donor gametes). Figures are approximate and drawn from the HFEA's multi-year aggregated data to smooth out single-year statistical noise.

Age Group	Live Birth per Embryo Transfer	Live Birth per Cycle Started	Likely Cycles for ~75% Chance
Under 35	~32%	~29%	3 cycles
35–37	~25%	~22%	4 cycles
38–39	~19%	~16%	5+ cycles
40–42	~11%	~9%	8+ cycles (diminishing returns)
43–44	~5%	~4%	Donor egg usually recommended
45+	<2%	<2%	Donor egg strongly recommended

*Source: HFEA Fertility Treatment trends and figures, latest aggregated reporting period. "Live birth" is defined as a child born alive after at least 24 weeks' gestation.*

Why the numbers drop

The single biggest driver is egg quality. From around age 35, the proportion of a woman's eggs that are chromosomally normal (euploid) declines — slowly at first, then steeply from about 38 onwards. By age 43, typically fewer than 10% of eggs produced in a stimulated cycle will be chromosomally normal.

Since only chromosomally normal embryos reliably lead to a viable pregnancy, fewer viable eggs means fewer viable embryos, which means lower success per transfer. No clinical intervention currently available meaningfully reverses this trend — which is why age is the single strongest predictor of IVF outcome.

Cumulative Success Rates — What Actually Matters

Per-cycle success rates look discouraging. Cumulative rates (what your chances look like across multiple attempts) are more realistic — because very few people stop after one unsuccessful cycle.

Age Group	1 Cycle	2 Cycles	3 Cycles	Plateau
Under 35	29%	~48%	~60%	~65–70% after 4–5 cycles
35–37	22%	~38%	~49%	~55% after 4–5 cycles
38–39	16%	~29%	~38%	~45% after 4–5 cycles
40–42	9%	~16%	~22%	~25–30% (significant plateau)
43+	<4%	~7%	~10%	~12% (strong case for donor egg)

*Cumulative rates are approximate estimates based on HFEA multi-cycle data, assuming you use any frozen embryos from previous cycles before starting a new stimulated cycle.*

The cumulative graph is the one your clinic should be showing you. For women under 38 who are willing and able to do 3 cycles, IVF is — statistically — a likely path to a live birth. After 40, the story changes materially.

See realistic total costs for multi-cycle treatment →

Success Rates With Donor Eggs

Donor egg IVF is the data point that most clearly demonstrates that eggs matter more than age. When a donor provides the eggs, the recipient's age has almost no impact on the live birth rate.

Recipient Age	Live Birth per Embryo Transfer (Donor Eggs)
Under 35	~45–50%
35–39	~42–48%
40–42	~40–47%
43–45	~38–45%
45+	~35–42%

*Source: HFEA donor egg treatment outcomes. UK donor egg pipelines are smaller than the US or Spain, so fresh donor cycles can take 6–18 months to match — many UK patients use frozen donor eggs imported from European egg banks, which have similar success rates.*

For a woman over 42 using her own eggs, the per-cycle live birth rate is around 10%. For the same woman using donor eggs, it's around 40%. That's why donor eggs are often recommended from the mid-40s — and why some clinics will recommend moving to donor eggs after 1–2 unsuccessful cycles at 40+.

Learn more: Donor Egg IVF in the UK →

ICSI Success Rates

ICSI (intracytoplasmic sperm injection) is used in roughly 70% of UK IVF cycles — much higher than the proportion with diagnosed male-factor infertility. Does it improve your odds?

The answer, based on HFEA data, is: not if the sperm is normal.

Scenario	Standard IVF Success	ICSI Success
Normal sperm parameters	~30% per transfer (under 35)	~29% per transfer (under 35)
Male-factor infertility	~12% per transfer	~26% per transfer
Previous fertilisation failure	~15% per transfer	~25% per transfer

*Age-adjusted figures. Per HFEA published data.*

The evidence is consistent: ICSI closes the gap where there's a real sperm issue, but offers little benefit where sperm parameters are normal. Yet most UK clinics use it routinely — partly because it gives more predictable fertilisation rates, partly because it's a significant additional revenue line.

What to ask: If your clinic recommends ICSI, ask specifically whether your semen analysis shows parameters that justify it. If the answer is vague, get a second opinion — ICSI adds around £1,000–£1,500 per cycle and, based on HFEA data, does not improve outcomes when used routinely.

See the full add-on evidence review →

Success Rates by UK Clinic

Clinic-to-clinic variation can be substantial — sometimes more substantial than a full age band's worth of decline. HFEA requires every licensed clinic to report success rates and makes them searchable.

What drives clinic-level variation

Patient selection. Clinics that only accept "easier" cases (younger, no medical complications) report higher headline rates. Clinics that take on complex cases often have lower raw numbers but equally skilled teams
Lab quality. Embryology is where the variance really is. Differences in air quality, culture media, incubator technology, and embryologist skill compound into meaningfully different outcomes
Protocol choice. Some clinics default to harder stimulation (more eggs, more risk of OHSS); others use mild stimulation (fewer eggs, gentler process). Cumulative success rates often end up similar, but per-cycle figures differ
Embryo transfer policy. Some clinics transfer only the strongest embryos, boosting per-transfer rates; others transfer embryos other clinics would discard, lowering per-transfer but sometimes improving cumulative

Using HFEA data properly

The HFEA Choose a Clinic tool shows success rates adjusted for age, but not for every variable. When comparing clinics:

Filter by your age band — not the clinic's overall average
Check sample size — a clinic doing 100 cycles/year has high statistical noise; a clinic doing 1,500 cycles/year has more reliable numbers
Look at multiple years — single-year fluctuations are normal; a clinic with stable or improving rates over 3+ years is a better bet than a single great year
Compare per cycle started, not per transfer — this is less manipulable

Compare UK IVF clinics by success rate → — our tool filters by age, clinic, and cost alongside HFEA figures.

Factors Beyond Age That Affect Success

Age is the single biggest factor, but not the only one. Within any age band, outcomes vary substantially based on:

Ovarian reserve

Measured by AMH (Anti-Müllerian Hormone) and antral follicle count (AFC). A 32-year-old with low ovarian reserve may have success rates closer to a typical 37-year-old. Request an AMH test before treatment — £60–£120 privately, sometimes available via your GP.

BMI

Both very low (under 19) and elevated (over 30) BMI reduce IVF success rates — studies show a 10–25% lower live birth rate at BMI over 30 versus 19–25. Most UK clinics will ask you to reach a BMI under 30 before starting, and NHS-funded treatment requires it.

Smoking and alcohol

Smoking reduces IVF success by roughly a third. Cessation 3 months before treatment recovers most of the gap. Heavy alcohol use (over 14 units/week for women) is also linked to lower success.

Underlying diagnosis

Diagnosis	Relative Impact on IVF Success
Unexplained infertility	Baseline (no adjustment)
Tubal factor	Baseline (IVF bypasses the issue)
Male factor (with ICSI)	Baseline when ICSI used appropriately
Endometriosis (mild)	Slightly lower
Endometriosis (severe)	Significantly lower, especially if ovarian reserve reduced
PCOS	Sometimes higher per retrieval (more eggs) but with OHSS risk
Diminished ovarian reserve	Significantly lower, regardless of age
Recurrent miscarriage	Lower due to embryo quality issues

Previous IVF history

If you've had 1–2 unsuccessful cycles, your chances in the next cycle are still meaningful — the cumulative tables above account for repeat cycles. After 3–4 unsuccessful cycles using your own eggs (and no identifiable reversible issue), the per-cycle odds decline further, and donor eggs or alternative approaches are usually discussed.

Success Rates for Women Over 40

The most searched age band — because it's where the numbers get uncomfortable and most media coverage is alarmist.

Age	Live Birth per Transfer (Own Eggs)	Live Birth per Transfer (Donor Eggs)
40	~13%	~45%
41	~11%	~44%
42	~9%	~42%
43	~6%	~40%
44	~4%	~38%
45+	<2%	~35%

*Source: HFEA age-band data for women 40+, latest reporting period.*

What this actually means

At 40, the per-cycle number looks low but cumulative chances across 3 cycles with your own eggs are around 22%. Not good, but not zero
At 42, cumulative across 3 cycles is about 12%. At this point, most clinics will discuss donor eggs as a realistic alternative
At 44, cumulative is under 10% with own eggs — and the chance of a chromosomally abnormal pregnancy and miscarriage is high, which many headline success rate figures don't fully reflect
At 45+, the HFEA does not recommend IVF with your own eggs from a cost-benefit perspective in most cases — but donor egg success stays above 35%

Quality of life trade-offs

At this age band, IVF decisions involve real trade-offs: cost, time, emotional investment, and the cumulative risk of pregnancy loss. Most good UK clinics will have an honest conversation with you about this. If your clinic is pushing treatment with your own eggs into your mid-40s without discussing donor eggs, that's a signal to get a second opinion.

Does a "Better Clinic" Actually Improve Your Odds?

Yes — but less than age, and by less than marketing suggests.

Within age bands, the best-performing clinics typically report live birth rates 20–40% higher (relative) than the UK average. So at age 35–37, the average is ~25% per transfer, and a top clinic might be 30–32%. That's a meaningful difference across cumulative cycles — potentially the difference between 49% and 58% after three cycles — but it isn't "twice the odds" as some clinic marketing implies.

Most of the clinic-level variation is:

Lab quality (biggest driver — embryology is where outcomes are made)
Patient mix (which the raw numbers don't fully control for)
Protocol tailoring (a good clinic adjusts to you rather than using a one-size-fits-all protocol)

The realistic framing: a good clinic might move your 3-cycle cumulative chance from (say) 49% to 56%. Not transformational, but not trivial either. And a poor clinic can subtract as much as a good one adds.

Frequently Asked Questions

What is the UK IVF success rate?

The UK IVF live birth rate per embryo transferred, averaged across all ages and using own eggs, is approximately 22% (HFEA aggregated data). This is the headline figure — but it hides huge age-related variation. Under 35: ~32%. Over 40: ~11%. Over 43: ~5%. Donor egg cycles are around 40–50% at all recipient ages.

What is the IVF success rate by age in the UK?

Per embryo transferred, using own eggs: under 35 ~32%, 35–37 ~25%, 38–39 ~19%, 40–42 ~11%, 43–44 ~5%, 45+ under 2%. Cumulative across 3 cycles: ~60% under 35, ~49% at 35–37, ~38% at 38–39, ~22% at 40–42.

How does age affect IVF success rates?

Age affects egg quality more than any other factor. The proportion of chromosomally normal eggs drops from around 75% in your early 20s to about 50% at 35, 30% at 40, and under 10% at 43. Fewer viable eggs means fewer viable embryos, which means lower live birth rates. Sperm quality declines more slowly and has a smaller effect on IVF outcomes.

What is the IVF success rate over 40?

Per embryo transferred with your own eggs: around 13% at 40, 9% at 42, 4% at 44, under 2% at 45+. Cumulative across 3 cycles at age 40 is about 22%. Donor egg success rates remain around 40–45% regardless of age, which is why many clinics recommend donor eggs from the mid-40s.

Do ICSI success rates differ from standard IVF?

For couples with normal sperm, ICSI success rates are effectively identical to standard IVF (~30% vs ~29% per transfer under 35). For couples with male-factor infertility, ICSI more than doubles success rates (26% vs 12% per transfer). Routine ICSI with normal sperm adds £1,000–£1,500 per cycle without improving outcomes.

Are IVF success rates higher at private clinics than NHS?

The published HFEA data doesn't separate NHS from private cycles meaningfully — most NHS IVF is delivered by the same clinics that offer private treatment. Outcomes are similar when age and diagnosis are controlled for. NHS patients sometimes have better outcomes on average because of stricter eligibility criteria (younger, healthier BMI, non-smoker) — not because the care is different.

Why do some clinics advertise success rates of 60% or 70%?

Usually they're quoting a flattering denominator — e.g. live birth per embryo transferred in women under 35 using PGT-A-tested embryos. Cumulative and overall rates are always lower. Always ask for "live birth per cycle started, age-matched to me" to get a fair comparison.

Does adding IVF add-ons increase success rates?

The HFEA's traffic light system rates most IVF add-ons as Amber or Red — meaning the evidence does not support them improving live birth rates. Only embryo glue (hyaluronate) currently has a Green rating, and even that is marginal. Don't assume expensive add-ons are raising your odds unless your clinic can show you the specific evidence for your situation.

How many IVF cycles should I plan for?

Most clinics now plan in terms of cumulative odds across 3 cycles. For women under 38, three cycles typically gives cumulative live birth rates of 38–60%. After three cycles without success, most clinicians recommend a diagnostic review before a fourth cycle. For women over 42, 1–2 cycles with own eggs is a common plan before considering donor eggs.

What's the success rate using frozen embryos?

Frozen embryo transfer (FET) success rates are now equal to or slightly higher than fresh transfers in most UK clinics, particularly for women under 40. Modern vitrification techniques mean 95%+ embryo survival on thaw. FET also avoids the hormonal peak of a stimulated cycle, which some studies show improves implantation.

Next Steps

If you're planning treatment:

If you're over 40:

*Last updated April 2026. Success rate figures are derived from HFEA Fertility Treatment aggregated data across the most recent multi-year reporting period. Individual clinic performance varies — always check the specific clinic's HFEA published rates for your age band. This content is for informational purposes only and does not constitute medical advice. Your individual outcome depends on many clinical factors — discuss your specific situation with a qualified fertility specialist.*