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The likelihood of having a baby using freeze-storage eggs from an egg-banking scheme increases with the number of eggs the recipient is able to use. This is according to results of a study from Europe's largest egg-banking programme.
The study analysed the experience of more than 3,400 patients using an egg bank for egg donation treatment (and more than 40,000 frozen eggs). The results showed that cumulative live birth rates were high and increased progressively according to the number of eggs used in the treatments.
Results are after one or more treatments
10 eggs - 39.4%
20 eggs - 75.9%
30 eggs - 88.7%
40 eggs - 97.3%
This rapid rate of increase slowed when 30 eggs were used and reached a peak with the use of 40 vitrified eggs.
The rapid freezing technique of vitrification has revolutionised egg banking such that the viability of vitrified eggs is now similar to that of fresh eggs. However, as in any fertility treatment, not all eggs will fertilise to become embryos, and not every embryo will implant as a pregnancy - which is why so many are needed to ensure reasonable delivery rates.
The study, which was reported at the Annual Meeting of ESHRE in Munich in June, provides the first everyday guide to how patients may benefit from egg donation treatments using a freeze-storage egg bank.
Find out more about the egg-freezing process.
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