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1
This retrospective cohort included 126 in utero transfer episodes for threatened extremely preterm birth at a London tertiary centre from 2021 through 2025.
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2
Half of transfers occurred before 26 weeks’ gestation; the leading indications were preterm labour (55.5%), maternal sepsis (31.0%), and antepartum haemorrhage (21.4%).
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3
After transfer, 53 of 126 women (42%) delivered at St George’s Hospital.
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4
The study assessed transfer-to-delivery intervals, maternal length of stay among women who did not deliver, and variation by gestational age and transfer indication.
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5
Maternal sepsis was based on clinician-documented suspicion at referral, not a standardised diagnostic definition, which the authors identified as a limitation.
