UK: twins and triplets after IVF are 4.6 times rarer, while more transfers succeed
Multiple births were 14.4% of IVF births in 2014 and 3.2% in 2024. Births per 100 embryos transferred: 30, up from 20. 2024 is preliminary.
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The denominators differ. Births per embryo use patient eggs; multiple births include patient and donor eggs. These are concurrent directions, not a policy-effect estimate.
One percentage scale relative to 2014: 0% is the starting value, +100% is a doubling, −50% is a halving. Lines show the yearly path; on a short screen, bars show the change to 2024. Equal distances mean equal relative changes. For shares, this is relative change, not percentage points. Gaps are not filled; original values and units are below.
- Births per 100 embryos live-birth occurrences per 100 embryos transferred
20 (2014) → 30 (2024)
- Multiple births, % % of IVF live-birth occurrences
14.38 (2014) → 3.16 (2024)
Published values for the selected period without interpolation. The headline describes an observation, not a causal effect.
UK licensed clinics; one clinic excluded. Treatment-start year. 2020–21 are preliminary; 2024 birth outcomes are preliminary and may be revised. Patients overlap across treatment types. Cycles, patients, embryos and birth occurrences differ. The data do not establish causes of change.
A question for this picture
What changes as single-embryo transfers become more common?