PPO.24 The impact of the frequency of fetal ultrasound in the third trimester and the rate of stillbirth in low risk pregnancies

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ObjectivesTo determine if performing fetal growth scans once or twice in the third trimester of pregnancy has an impact on the stillbirth rate in low-risk pregnanciesMethodsA retrospective observational study was performed in a tertiary centre. Data was collected using the computerised Northern Ireland Maternity System (NIMATs) on all births and stillbirths in the Royal Maternity Hospital from 2009–2012. We compared pre-2011 versus post 2011 i.e. when patients were scanned twice in the third trimester versus once routinely. Statistical analysis was performed using SPSSResultsThere were 18,856 deliveries in ‘low-risk’ patients from 2009–2012. The average stillbirth rate in this group was 0.25% per number of low risk pregnancies per annum. The stillbirth rate in the 2009/2010 group was 0.25%. The stillbirth rate in the 2012 group was 0.27%. This difference was not statistically significant [p = 0.897; chi square = 0.017; df =1].ConclusionsThis study indicates that there is no difference in stillbirth rate when a strategy of scanning once or twice in the third trimester of pregnancy is employed in women with an apparent normal pregnancy. A randomised controlled trial is required to determine if routine fetal biometry can reduce stillbirth. This is unlikely to be performed given the large numbers required to perform such a trial which is approximately 250,000 subjects per arm.

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