title: Accuracy of different equations for estimating fetal weight.
abstract: OBJECTIVE
  To evaluate the accuracy of ten equations based on ultrasound parameters for estimating fetal weight (FW).
  
  
  METHODS
  A cross-sectional study was performed in 250 healthy women with normal singleton pregnancies between 34 and 41 weeks of gestation. FW estimations calculated according to ten different equations were compared against birth weight (BW) which was determined within 72 h after FW estimation. Estimated error rate, intraclass correlation coefficient, and agreement between BW and FW calculated by each formula were analyzed.
  
  
  RESULTS
  Most of the formulas were inaccurate in predicting BW, only 2 formulas showed less than 10% of the measurements lying within the 10% of estimated error. Four formulas tended to overestimate, while six tended to underestimate FW.
  
  
  CONCLUSIONS
  Appropriate equations for estimating FW in all populations should be developed. However, where there are no local growth curves, the accuracy of the available fetal growth equations should be tested.
authors: Department of Maternal-Fetal Medicine, National Institute of Perinatal Medicine (INPer), Mexico City, Mexico.
authors: Andrés
authors: A
authors: Benavides-Serralde
authors: Edgar
authors: E
authors: Hernandez-Andrade
authors: Alfredo
authors: A
authors: Fernandez-Lara
authors: Francesc
authors: F
authors: Figueras
authors: Oscar
authors: O
authors: Moreno-Álvarez
authors: Lisbeth
authors: L
authors: Camargo-Marín
authors: Sandra
authors: S
authors: Acevedo-Gallegos
authors: Juan
authors: J
authors: Gallardo-Gaona
authors: Berenice
authors: B
authors: Velázquez-Torres
authors: Mario
authors: M
authors: Guzmán-Huerta
mesh_terms: D000293:Adolescent; D000328:Adult; D001724:Birth Weight; D001837:Body Weights and Measures / Q000379:methods; D003430:Cross-Sectional Studies; D005260:Female; D020567:Fetal Weight; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D015203:Reproducibility of Results; D016216:Ultrasonography, Prenatal; D055815:Young Adult