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Predicting macrosomia.

Jason A Pates1, Donald D McIntire, Brian M Casey

  • 1Department of Obstetrics and Gynecology, Madigan Army Medical Center, Tacoma, WA 98431, USA. jason.pates@nw.amedd.army.mil

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
|December 22, 2007
PubMed
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Predicting fetal macrosomia (birth weight ≥4000g) is improved by combining clinical risk factors with ultrasound estimated fetal weight and amniotic fluid index. This combined approach achieved a 71% positive predictive value for macrosomia.

Area of Science:

  • Obstetrics and Gynecology
  • Fetal Medicine
  • Diagnostic Imaging

Background:

  • Fetal macrosomia poses risks during delivery.
  • Accurate prediction of macrosomia is crucial for optimal perinatal outcomes.
  • Ultrasound and clinical factors are used to assess fetal weight and delivery risks.

Purpose of the Study:

  • To evaluate the predictive accuracy of fetal macrosomia.
  • To assess the combined utility of ultrasound estimated fetal weight (EFW) and amniotic fluid index (AFI) with clinical risk factors.

Main Methods:

  • Retrospective cohort study design.
  • Inclusion of women with ultrasound examinations within 7 days of delivery.
  • Analysis of clinical risk factors, ultrasound EFW, and AFI.

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Main Results:

  • Clinical risk factors alone had an 8% positive predictive value for macrosomia.
  • Adding ultrasound EFW ≥4000g increased predictive value to 62%.
  • Combining clinical factors, EFW ≥4000g, and AFI ≥20cm yielded a 71% positive predictive value.

Conclusions:

  • Ultrasound EFW, AFI, and clinical risk factors significantly improve macrosomia prediction.
  • A combined approach offers a 71% positive predictive value for identifying macrosomia within one week of delivery.