Investigating the utility of the customised fetal growth chart: a randomised controlled trial

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Adverse fetal growth is strongly associated with adverse pregnancy outcome for the fetus and newborn. Close monitoring of fetal growth is an essential component of antenatal care in order to try and reduce the resultant risks associated with adverse growth. It is standard practice to assess fetal growth by measuring symphyseal fundal height (SFH) at each antenatal visit and assessing the growth in line with a standard non-individualised growth chart. We have developed a customised growth chart that we hypothesise that when compared to a standard growth chart, reduces the risk of adverse pregnancy outcome through increased detection of adverse growth. Therefore, this study is a single centre, blinded, two-arm, randomised controlled trial to compare the detection rates of adverse growth (both slowed growth and accelerated growth) and adverse fetal and neonatal outcomes when using a customised fetal growth chart compared with a standard growth chart. The study will be run at the Mater Mothers’ Hospital Antenatal Clinic, with women randomly allocated to receive either the standard chart or customised chart. This chart will then be used throughout pregnancy to plot serial measurements of SFH to monitor fetal growth. We aim to reduce the rate of our composite perinatal morbidity outcome measure from 10% to 7.5%, which will require randomising 4,010 women. If our study hypothesis is proven, the low cost nature of this tool allows for the possibility of implementation into developing countries, as well as rural and remote Australian settings, that do not have sophisticated monitoring equipment. By implementing such a low cost solution to the difficult task of monitoring growth, there are potentially very large human and economic benefits from this research.

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