Biometría fetal: capacidad predictiva para los nacimientos grandes para la edad gestacional

Background: predicting big-for-gestational-age births since early stages is a health action that deserves to have technological tools of proven efficiency that guarantees it. Objective: to determine predictive capacity of the biometric measurements and the estimation formulas of fetal weight for big-for-gestational-age births. Methods: a retrospective study of all single pregnancies was carried out at Chiqui Gomez Lubian clinic in Santa Clara from January 2009 to December 2014. Receiver operating characteristic curves were built to assess fetal biometry in each trimester and to calculate estimation formulas of fetal weight. An area under the curve was showed as a predictive capacity for big-for-gestational-age births; cut-off points were determined and contrasted with tables of national reference. Results: the abdominal circumference and the formula of Hadlock including the cephalic circumference and the longitude of the femur were the biometric measurements and the formulas of estimation of fetal weight respectively, with better area under the curve in the second and third trimester of the gestation. Cut-off points found in this study allowed a better classification for big-for-gestational-age births than the tables of reference in Cuba. Conclusions: biometric measurements and estimation formulas of fetal weight can predict big-for-gestational-age births since early stages. Cut-off points for the local population allow a better classification than the ones used until now. DeCS: BIOMETRY; FETAL WEIGHT; GESTATIONAL AGE; FORECASTING; LONGITUDINAL STUDIES.