Journal
JOURNAL OF ULTRASOUND IN MEDICINE
Volume 27, Issue 1, Pages 39-43Publisher
WILEY
DOI: 10.7863/jum.2008.27.1.39
Keywords
amniotic fluid index; macrosomia; prediction; ultrasound
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Objective. The purpose of this study was to evaluate the prediction of fetal macrosomia based on ultrasound estimates of fetal weight and amniotic fluid volume combined with clinical risk factors. Methods. A retrospective cohort study of women undergoing indicated obstetric ultrasound examinations within 7 days of delivery was conducted. Results. A total of 3115 women gave birth within 7 days of ultrasound examinations that included an estimated fetal weight (EFW) and. an amniotic fluid index (AFI). Clinical risk factors were associated with an 8% positive predictive value for a birth weight of 4000 g or higher. Adding an ultrasound EFW of 4000 g or higher increased the positive predictive value to 62%. Adding an AFI of 20, cm or higher to the clinical risk factors and the ultrasound EFW further increased the positive predictive value to 71%. Conclusions. An ultrasound EFW of 4000 g or higher within 1 week of delivery combined with clinical risk factors and an increased AFI is associated with macrosomia at birth in 71% of cases.
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