title: [Accuracy of ultrasound estimated fetal weight performed by residents at delivery day].
abstract: Ultrasound fetal weight estimation (EFW) has become a routine practice in obstetrics with a major impact on obstetrical management.
  
  
  OBJECTIVE
  To evaluate the accuracy of sonographic fetal weight estimations performed by residents in obstetrics at the delivery day and to search parameters influencing this exam.
  
  
  METHODS
  A prospective study performed in 299 patients at 37 weeks of gestation or more, during their delivery day. Ultrasound fetal weight estimations were performed by residents and compared to birth weights (BW). The estimated fetal weight (EFW) was calculated using the formula of Hadlock: Log10 EPF=1,335+0.0316 BIP+0,0457 PA+0,1623 LF-0,0034 PA LF.
  
  
  RESULTS
  Mean absolute difference between EFW and BW was 200g [100-450]. Mean absolute percentage error was 5.71 % [2.7-11.37]. The proportion of the EFW within 10 % of BW was 69.6 %. There was a good correlation between EFW and BW (R=0.79). Obesity and fetal macrosomia had negatively influenced ultrasound performance. For the diagnosis of macrosomia, ultrasound has a sensibility of 38 % and a specificity of 99.59 %.
  
  
  CONCLUSIONS
  Ultrasound fetal weight estimations performed by residents in the delivery room were as accurate as those performed by experimented sonographers. Thus, the predictive performance remains limited with a low sensitivity in the diagnosis of macrosomia.
authors.affiliation: Service de gynécologie-obstétrique, CHU Mongi-Slim, Sidi-Daoud, 2046 La Marsa, Tunisie; Faculté de médecine Tunis El Manar, Tunis, Tunisie. Electronic address: kaouther.dimassi@gmail.com.
authors.forename: K
authors.initials: K
authors.lastname: Dimassi
authors.affiliation: Service de gynécologie-obstétrique, CHU Mongi-Slim, Sidi-Daoud, 2046 La Marsa, Tunisie.
authors.forename: Y
authors.initials: Y
authors.lastname: El Cadhi
authors.affiliation: Service de gynécologie-obstétrique, CHU Mongi-Slim, Sidi-Daoud, 2046 La Marsa, Tunisie.
authors.forename: R
authors.initials: R
authors.lastname: Sahnoune
authors.affiliation: Service de gynécologie-obstétrique, CHU Mongi-Slim, Sidi-Daoud, 2046 La Marsa, Tunisie; Faculté de médecine Tunis El Manar, Tunis, Tunisie.
authors.forename: M
authors.initials: M
authors.lastname: Derbel
authors.affiliation: Service de gynécologie-obstétrique, CHU Mongi-Slim, Sidi-Daoud, 2046 La Marsa, Tunisie; Faculté de médecine Tunis El Manar, Tunis, Tunisie.
authors.forename: A
authors.initials: A
authors.lastname: Triki
authors.affiliation: Faculté de médecine Tunis El Manar, Tunis, Tunisie.
authors.forename: H
authors.initials: H
authors.lastname: Ben Romdhane
authors.affiliation: Service de gynécologie-obstétrique, CHU Mongi-Slim, Sidi-Daoud, 2046 La Marsa, Tunisie; Faculté de médecine Tunis El Manar, Tunis, Tunisie.
authors.forename: F
authors.initials: F
authors.lastname: Gara
mesh_terms: D000328:Adult; D001724:Birth Weight / Q000502:physiology*; D036861:Delivery, Obstetric / Q000592:standards*; D005260:Female; D005320:Fetal Macrosomia / Q000000981:diagnostic imaging*; D020567:Fetal Weight / Q000502:physiology*; D005865:Gestational Age; D006801:Humans; D007396:Internship and Residency / Q000592:standards*; D009774:Obstetrics / Q000193:education*; D011247:Pregnancy; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D016216:Ultrasonography, Prenatal / Q000592:standards*
keywords: Concordance; Correlation; Corrélation; Fetal weight; Hadlock; Poids fœtal; Ultrasound; concordance; Échographie