biostudies-literatureUnknown13(6)Ma J<h4>Background</h4> Despite being the most generalized formula in China, the Hadlock IV formula has never been examined to determine if it is suitable for Chinese newborns, nor have the factors that might affect its performance been investigated. However, previous studies have reported varying results about other formulas in other nationalities. This study sought to evaluate the performance of the Hadlock IV formula in estimating fetal weight (FW) in pregnant Chinese women and use ultrasound to identify the factors affecting the accuracy of estimations of newborn weight; through these means, we aimed to create a reference for predicting neonatal weight for obstetricians. <h4>Methods</h4> A retrospective observational study comprising data from 976 cases of live-birth singleton pregnancies Quantitative imaging in medicine and surgery3726-3734https://www.ebi.ac.uk/biostudies/studies/S-EPMC10240036biostudies-literatureEvaluating the accuracy of sonographic fetal weight estimations using the Hadlock IV formula in a Chinese populationPMC10240036Cai BCheng DZhang ZMa JXu XfalseEvaluating the accuracy of sonographic fetal weight estimations using the Hadlock IV formula in a Chinese population<h4>Background</h4> Despite being the most generalized formula in China, the Hadlock IV formula has never been examined to determine if it is suitable for Chinese newborns, nor have the factors that might affect its performance been investigated. However, previous studies have reported varying results about other formulas in other nationalities. This study sought to evaluate the performance of the Hadlock IV formula in estimating fetal weight (FW) in pregnant Chinese women and use ultrasound to identify the factors affecting the accuracy of estimations of newborn weight; through these means, we aimed to create a reference for predicting neonatal weight for obstetricians. <h4>Methods</h4> A retrospective observational study comprising data from 976 cases of live-birth singleton pregnancies 2023-01-01T00:00:00Z2023 Apr2025-04-04T14:40:32.922Z2025-04-04T14:40:32.922ZS-EPMC10240036