[Sonographic estimation of fetal weight at term: a proposal of a predictive score of a weight more than 4500 g].

Unlabelled: Estimation of fetal weight at term is essential because of risks of macrosomic infant delivery. The purpose of this study is to assess sonographic prediction of macrosomia and especially in fetal weight (o) > 4500 g.

Material And Method: In a retrospective study on one year period, we analyzed sonography of 214 pregnant women at term having delivered macrosomic infants. From sensitivity, specificity and VPP found for each fetal measurement (abdominal transverse diameter: ATD, femur length: FL, and biparietal diameter :BPD) we tried to determine the best thresholds values that permit to suspect fetal weight more than 4500 g.

Results: Sensitivity of ATD (o) > 100 mm, FL (o) > 76 mm and BPD (o) > 94 mm in prediction of macrosomia were: 70.5%, 56% and 58.9% respectively. The most reliable and predictive thresholds for macrosomia more than 4500 g were: 105 mm, 78 mm and 98 mm respectively for ATD, FL and BPD. In an other study, we have found that fundal height (o) > 37 cm is also predictive of such a macrosomia. So we have proposed a predictive score of fetal weight more than 4500 g, based on the best thresholds found for fundal height, ATD, FL and BPD.