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Fetal Abdominal Circumference And Macrosomia.

A fetal abdominal circumference measuring at least 38 cm is associated with a 37% chance of having a baby who will weigh at least 4,500 g, said Dr. Jennifer R. Gilby and her colleagues at the University of South Florida, Tampa.

Though exact fetal weight cannot be determined by clinical or ultrasound means, fetal abdominal circumference is a useful advance warning of the possibility of macrosomia, the investigators re ported (J. Reprod. Med. 45 [11]: 936-38, 2000).

Of 1,996 infants studied, 68 of 69 infants weighing at least 4,500 g had fetal abdominal circumference measurements of at least 35 cm. Thirty-seven of these 68 infants had fetal abdominal circumferences measuring at least 38 cm.

In addition, 37 of 99 infants with circumferences of at least 38 cm weighed at least 4,500 g. But when abdominal circumference was less than 35 cm, the chances were very slim (0.05%) that the baby would weigh at least 4,500 g.
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Author:Splete, Heidi
Publication:OB GYN News
Date:Mar 1, 2001
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