Diagnostic test evaluation of neonatal weight and macrosomia prediction
Objective To compare five formulas for predicting neonatal birth weight in order to find a formula with high accuracy.Methods A total of 168 singleton full-term pregnant women who were hospitalized in the obstetrics department of our hospital from May 2019 to September 2021 were selected as the research objects.The uterine height and abdominal circumference(AC)of pregnant women were measured.Fetal abdominnal circumference(FAC),head circumference(HC),biparietal diameter(BPD)and femoral diaphysis length(FL)were measured by ultrasound,fetal weight was calculated by five formulas.Taking birth weight as the gold standard,the sensitivity,specificity,false negative rate,false positive rate,accuracy,positive predictive value,negative predictive value,Youden index,positive likelihood ratio and negative likelihood ratio of the five formulas were calculated respectively.Results Five formulas were used to calculate and compare the number of macrosomia and non-macrosomia screened and the actual number of macrosomia and non-macrosomia,the actual incidence of macrosomia was 10.12％(17/168).The sensitivity of formula 5 was the highest,which was 70.59％;followed by formulas 3 and 4,both of which were 58.82％;the accuracy of formula 1,2,3,4 and 5 was 89.29％,88.69％,89.88％,88.10％and 87.50％,respectively,the accuracy of the five formulas was close.Conclusion Macrosomia may bring many adverse pregnancy outcomes.Formula 2 combined with uterine height ≥38 cm(formula 5)has higher sensitivity in predicting macrosomia,which can be used as the main reference bass for obstetricians to judge macrosomia,guide labor process and reduce maternal and infant complications.
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