Abstract
Objectives:To investigate the factors which might influence the sonographic fetal weight estimation (SFWE) accuracy.Methods:This prospective study was conducted among 949 singleton term pregnant women who delivered at a tertiary center, from January 2017 to December 2017. All participants’ maternal (i.e. parity, age, body mass index and gestational weight gain during pregnancy), fetal sonographic (i.e. fetal presentation, amniotic fluid index, localization of placenta and estimated fetal weight) and neonatal (birth weight and gender) characteristics were recorded. A p<0.05 was considered significant.Results:The mean absolute percent error (APE) values of SFWE was 8.2±6.5 percent, and overall failure ratio (APE >10%) was 33%. In failure group, primiparous woman and cephalic presentation fetus were significantly more common compared to accuracy group (55.9% vs.44.8%; p=0.001 and 98% vs. 95.2%; p=0.03, respectively). In contrast, the mean neonatal birth weight (NBW) value was significantly lower in failure group compared to success group (3250±565 gr vs. 3404±410 gr; p=0.001). The correlation between SFWE and NBW was linear, however negative, and significant (p=0.001). Logistic regression analysis revealed that primiparous woman, cephalic presentation fetus and <3300 gr NBW were independent risk factors for the SFWE failure (relative risks were 1.6, 2.8 and 2.4 respectively, p<0.05).Conclusion:SFWE has a high correlation with NBW, however it’s accuracy is still unsatisfactory, and depend on many unpredictable and inconsistent factors.
Highlights
Birth weight is an important factor determining maternal and neonatal well-being that significantly influences obstetric management.[1]
Maternal, fetal sonographic (SFWE [g], amniotic fluid volume [mm], placental localization [anterior vs. other]), and neonatal (NBW [g] and sex) characteristics of the participants were recorded during the study period
Except for the mean neonatal birth weight (NBW), fetal presentation, and parity, the groups did not differ according to the investigated parameters (Table-II)
Summary
Birth weight is an important factor determining maternal and neonatal well-being that significantly influences obstetric management.[1] fetal weight estimation has become an important aspect of examinations in the late period of pregnancy. To this end, various techniques, including clinical examinations, such as Leopold’s maneuvers,[2] sonography,[3] and magnetic resonance imaging,[4] have been used. Sonography has become the most common method for estimating fetal weight worldwide, because of its objectivity and ease of use. It is still debated whether sonography is a reliable tool for estimating fetal weight accurately.[5,6] In previous studies,[4,7,8] the accuracy of sonographic fetal weight estimation (SFWE), which is regarded
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