Fetal ultrasound estimated weight and correlation to Brazilian newborn weight

To compare the best fetal weight formula with different biometric tables on the weight of Brazilian newborns. This observational study has tested the performance of different common fetal weight formulas and biometric tables. Weight estimates were performed by the methods of Warsof . (1977), Shepard . (1982), Hadlock . (1985), Furlan . (2012) and Stirnemann . (2017). The biometric tables selected were the following: Snijders and Nicolaides (1994), Hadlock . (1984), Papageorghiou . (2014) and Kiserud . (2016) and correlated to Pedreira . (2011) database, which was considered the gold standard. Statistical analyses were performed using the mean relative error, average absolute error and the Pearson correlation coefficient (r). The best r was found when using the Snijders and Nicolaides (1994) biometric table with weight formula by Stirnemann . (2017). The average relative error was lower when using weight formula by Shepard . (1982) with biometric tables by Snijders and Nicolaides (1994), Papageorghiou . (2014) or Kiserud . (2016). On average, absolute error, the lowest r was obtained for the Furlan . (2012) weight formula and the Papageorghiou . (2014) biometric table. The best correlation was found for biometric table by Snijders and Nicolaides (1994) and fetal weight formula calculation for the estimation of Brazilian newborn weight by Stirnemann . (2017).