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Obstet Gynecol. 1999 Apr;93(4):523-6.

Macrosomia prediction using ultrasound fetal abdominal circumference of 35 centimeters or more.

Author information

  • 1Department of Obstetrics and Gynecology, Louisiana State University Medical Center, Shreveport, USA.

Abstract

OBJECTIVE:

To determine if birth weights greater than 4000 g can be predicted by ultrasound measurements of abdominal circumferences.

METHODS:

In 1996, 254 newborns delivered at Tampa General Hospital weighed at least 4000 g, 84 of whom had ultrasound examinations within 2 weeks of delivery. Those were compared with 84 neonates with recent ultrasounds who weighed less than 4000 g. Data were abstracted retrospectively from maternal medical records.

RESULTS:

The best linear predictor of birth weight was ultrasound measurement of abdominal circumference (AC), which had a correlation coefficient of 0.95. An AC measurement of 35 cm or more predicted 93% of macrosomic infants. Among 177 macrosomic infants born vaginally, 23 (13%) had shoulder dystocia. In that group, induction of labor was associated with a greater than three-fold increase in risk of shoulder dystocia (odds ratio [OR] 3.4, 95% confidence interval [CI] 1.4, 8.2; P < .01). Labor augmentation was not associated with increased risk of shoulder dystocia.

CONCLUSION:

Abdominal circumference measurements were useful in screening for suspected macrosomia. An AC measurement of 35 cm or more identified more than 90% of macrosomic infants who were at risk for shoulder dystocia. Induction of labor in macrosomic patients increased the risk of shoulder dystocia.

PMID:
10214826
[PubMed - indexed for MEDLINE]
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