title: Ultrasound weight estimation of large fetuses.
abstract: OBJECTIVE
  To compare the accuracy of fetal weight estimation in large fetuses using four ultrasound formulae.
  
  
  METHODS
  Prospective comparative study.
  
  
  METHODS
  University Hospital, Lund, Sweden.
  
  
  METHODS
  Large-for-gestational age fetuses (n= 114) at a routine ultrasound examination in the third trimester.
  
  
  METHODS
  The Persson & Weldner two-dimensional formula was compared with the Hart et al. two-dimensional formula incorporating maternal weight and with the Lee et al. and Lindell & Maršál three-dimensional formulae. The formulae are based on two-dimensional measurements of fetal head, abdomen and femur, and three-dimensional volumetry of fetal abdomen and thigh.
  
  
  METHODS
  Accuracy in detection of fetuses with birthweight >4000 and >4500 g.
  
  
  RESULTS
  For fetuses >4000 g, the Lindell & Maršál three-dimensional formula showed significantly smaller mean absolute percentage error than the Persson & Weldner two-dimensional and the Lee et al. three-dimensional formulae (p= 0.04 and p < 0.001, respectively). No significant difference between the Lindell & Maršál three-dimensional and the Hart et al. two-dimensional formulae was found. A receiver operating characteristic curve showed a higher detection rate for fetuses with birthweight >4500 g using a three-dimensional compared with a two-dimensional technique. The best performance in detecting fetuses with birthweight >4500 g was given by the Lindell & Maršál three-dimensional formula; for estimated fetal weight >4300 g, the detection rate was 93% and false-positive rate 38%.
  
  
  CONCLUSIONS
  The ability to detect macrosomic fetuses in a preselected high-risk group was higher using fetal weight estimation with a three-dimensional compared with a two-dimensional ultrasound technique, with or without the inclusion of maternal weight.
authors: Department of Obstetrics and Gynecology, Clinical Sciences Lund, Sweden. gun.lindell@med.lu.se
authors: Gun
authors: G
authors: Lindell
authors: Karin
authors: K
authors: Källén
authors: Karel
authors: K
authors: Maršál
mesh_terms: D000293:Adolescent; D000328:Adult; D005189:False Positive Reactions; D005260:Female; D005320:Fetal Macrosomia / Q000000981:diagnostic imaging*; D020567:Fetal Weight; D006801:Humans; D021621:Imaging, Three-Dimensional; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D011446:Prospective Studies; D012372:ROC Curve; D016216:Ultrasonography, Prenatal / Q000379:methods*; D055815:Young Adult