Study Finds Donor-Egg IVF Success Drops After 49 as Miscarriage Risk Nearly Doubles
Updated
Updated · bbc.co.uk · Jul 6
Study Finds Donor-Egg IVF Success Drops After 49 as Miscarriage Risk Nearly Doubles
3 articles · Updated · bbc.co.uk · Jul 6
Summary
1,774 women in a new study showed a clear fertility tipping point around age 49, with donor-egg IVF becoming less likely to lead to pregnancy or live birth.
At 49 and older, pregnancy rates fell to about 43% from 54% at ages 35-40, live birth rates dropped to 32% from 46%, and miscarriage rates rose to 38% from 24%.
Researchers said the findings challenge the idea that younger donor eggs fully reset reproductive ageing, pointing instead to age-related decline in the womb lining that may eventually be predicted or treated.
Experts stressed the threshold is not absolute and said the results should inform counselling rather than deter treatment, noting cumulative live birth rates still reached 62.5% in women 49 and older who transferred all embryos.
The study, presented at ESHRE, adds to debate over later-life fertility treatment in the UK, where there is no legal upper age limit for IVF but donor-egg treatment is usually self-funded.
IVF success with donor eggs plummets after 49. Is late-in-life motherhood's 'miracle' a myth?
As donor eggs fail to reset the clock, can new technology make an aging womb young again?
Donor-Egg IVF Success Rates Plummet After Age 49: New Research Reveals Uterine Aging as Key Limiting Factor
Overview
A major new study presented at ESHRE and published in 2026 shows that donor-egg IVF success rates drop sharply for women aged 49 and older. The research highlights that advanced maternal age not only increases the risk of miscarriage but also independently lowers the chances of a live birth, even when high-quality donor eggs are used. This is because the uterus itself ages and loses function, making it harder for embryos to implant and pregnancies to continue. The study identifies an age threshold where this decline begins, emphasizing that uterine health is just as important as egg quality in fertility treatments for older women.