Abstract
SummaryIn order to improve antenatal detection of ‘large for gestational age’ babies, a case-control study was performed in ultrasound dated pregnancies. There were 119 singleton term pregnancies with a birth weight of more than 2 s.d. above the mean for their gestational age. Controls were a random sample of 318 singleton term pregnancies, with birth weights within ± 2 s.d. of the mean for gestational age.After 38 weeks the sensitivity of symphysis-fundus measurements was 66 per cent, the specificity 88 per cent and the positive predictive value 13 per cent. Using multivariate analysis, symphysis-fundus height at 38 weeks, gestational age and parity had the strongest association with the delivery of a large for dates baby. If maternal risk factors were used in addition to symphysis-fundus measurements, the sensitivity, specificity and positive predictive value were improved. The symphysis-fundus curve can be a valuable screening tool in late pregnancy for antenatal identification of large fetuses in ultr...
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