Success rates: what the data shows by age
HFEA preliminary 2022 data places live birth rate per embryo transferred at approximately 35% for women under 35, falling to 26% at 35–37, 18% at 38–39, 10% at 40–42, and 5% at 43–44 (own-egg cycles, UK private and NHS combined). NICE NG257 access criteria (March 2026, replacing CG156) limit NHS-funded IVF to women under 42.
IVF outcomes are age-dependent, and the figures below summarise published HFEA national age-banded birth rates per embryo transferred — HFEA's primary published metric. Per-started-cycle rates are typically lower because not every cycle reaches transfer (freeze-all protocols, OHSS deferrals, lab-stage attrition). Cumulative cycle live birth rates across two or three cycles are higher and more clinically informative than single-cycle figures.
Clinics publishing headline success rates without an age band, without specifying the denominator, or without separating own-egg from donor-egg cycles are presenting an unreliable summary.
approximately 35% per embryo transferred
The highest age band; cumulative across three cycles approaches 60% in well-selected patients.
approximately 26% per embryo transferred
A modest but clinically meaningful step down from the under-35 band.
approximately 18% per embryo transferred
The decline accelerates from this band onward; cumulative cycle counselling becomes important.
approximately 10% per embryo transferred
NHS funding ends within this band per most ICB policies; donor-egg conversation often opens here.
approximately 5% per embryo transferred
Own-egg success rates fall sharply; donor-egg cycles produce materially higher live birth rates and warrant explicit clinical conversation.
approximately 2% or below per embryo transferred (own egg)
Donor-egg pathway is the primary clinical option above 44.