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The evidence base for miscarriage diagnosis: better late than never

On average it takes 10–20 years for knowledge generated by trials to be incorporated into clinical practice1. There is a real risk that, by the time clinical practice evolves to be ‘evidence-based’, the evidence itself may have changed. This issue of the Journal includes a series of four papers on the topic of miscarriage diagnosis – the commonest emergency indication for an ultrasound in pregnancy. I have little hesitation in suggesting that these papers may well be the most practice-changing that UOG has published.