[Accuracy of ultrasound estimated fetal weight performed by OB-Gyn residents at due date].
OBJECTIVE
The aim of this study was to evaluate the accuracy of ultrasound fetal weight prediction at due date and to find parameters that may affect this prediction.


METHODS
We retrospectively studied 201 patients at due date in a university hospital in 2006, the fetal weight estimation being performed by Obstetric-gynecology (OB-Gyn). Estimated fetal weight was calculated with the Hadlock's formula, including biparietal diameter, cephalic circumference, abdominal perimeter and femoral length and was compared with birth weight.


RESULTS
The mean birth weight was 3561+/-415 g. The mean absolute weight difference was 261+/-190 g (absolute range: 0 to 1183 g, actual range: -935 to 1183 g). Body mass index>30 kg/m(2) was associated with greater fetal weight inaccuracy (p=0,013). Fetal weight estimation was not influenced by fetal macrosomia, oligoanamnios or maternal weight gain during pregnancy.


CONCLUSIONS
The sonographic estimated fetal weight and birth weight are correlated with a mean absolute percentage error of 7%. However, clinicians should be aware of the risk of inaccuracy in obese women.
Houzé de l'Aulnoit
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Clinique d'obstétrique, hôpital Jeanne-de-Flandre, CHRU de Lille, 1, rue Eugène-Avinée, 59037 Lille cedex, France. ahouzedelaulnoit@yahoo.fr
Closset
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E
Deruelle
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D000005:Abdomen / Q000033:anatomy & histology / Q000196:embryology; D001724:Birth Weight; D005260:Female; D005269:Femur / Q000033:anatomy & histology / Q000196:embryology; D020567:Fetal Weight; D006801:Humans; D007231:Infant, Newborn; D007396:Internship and Residency; D010296:Parietal Lobe / Q000033:anatomy & histology / Q000196:embryology; D010298:Parity; D011247:Pregnancy; D012189:Retrospective Studies; D012886:Skull / Q000033:anatomy & histology / Q000196:embryology