title: Ultrasound Fetal Weight Estimation: How Accurate Are We Now Under Emergency Conditions?
abstract: The primary aim of this study was to evaluate the accuracy of sonographic estimation of fetal weight when performed at due date by first-line sonographers. This was a prospective study including 500 singleton pregnancies. Ultrasound examinations were performed by residents on delivery day. Estimated fetal weights (EFWs) were calculated and compared with the corresponding birth weights. The median absolute difference between EFW and birth weight was 200 g (100-330). This difference was within ±10% in 75.2% of the cases. The median absolute percentage error was 5.53% (2.70%-10.03%). Linear regression analysis revealed a good correlation between EFW and birth weight (r = 0.79, p < 0.0001). According to Bland-Altman analysis, bias was -85.06 g (95% limits of agreement: -663.33 to 494.21). In conclusion, EFWs calculated by residents were as accurate as those calculated by experienced sonographers. Nevertheless, predictive performance remains limited, with a low sensitivity in the diagnosis of macrosomia.
authors.affiliation: Obstetrics and Gynecology Unit, Mongi Slim Hospital, La Marsa, Tunisia; Faculté de Médecine, Université de Tunis El Manar, Tunis, Tunisia. Electronic address: kaouther.dimassi@gmail.com.
authors.forename: Kaouther
authors.initials: K
authors.lastname: Dimassi
authors.affiliation: Obstetrics and Gynecology Unit, Mongi Slim Hospital, La Marsa, Tunisia.
authors.forename: Fatma
authors.initials: F
authors.lastname: Douik
authors.affiliation: Obstetrics and Gynecology Unit, Mongi Slim Hospital, La Marsa, Tunisia.
authors.forename: Mariem
authors.initials: M
authors.lastname: Ajroudi
authors.affiliation: Obstetrics and Gynecology Unit, Mongi Slim Hospital, La Marsa, Tunisia.
authors.forename: Amel
authors.initials: A
authors.lastname: Triki
authors.affiliation: Obstetrics and Gynecology Unit, Mongi Slim Hospital, La Marsa, Tunisia; Faculté de Médecine, Université de Tunis El Manar, Tunis, Tunisia.
authors.forename: Mohamed Faouzi
authors.initials: MF
authors.lastname: Gara
mesh_terms: D002983:Clinical Competence / Q000706:statistics & numerical data*; D004632:Emergency Medical Services / Q000706:statistics & numerical data*; D005260:Female; D020567:Fetal Weight; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008297:Male; D015588:Observer Variation; D011247:Pregnancy; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014416:Tunisia / Q000453:epidemiology; D016216:Ultrasonography, Prenatal / Q000379:methods* / Q000706:statistics & numerical data*
keywords: Birth weight; Fetal weight; Neonatal; Ultrasound estimation