Validity of Ultrasound for estimation of fetal weight in term singleton pregnancies
Keywords:Estimated fetal weight, Hadlock formula, Small for gestational age, newborn weight, Macrosomia
Background and Objectives: To assess the accuracy of fetal weight estimation by Ultrasoundto predict the actual birth weight.
Methods: A prospective cross-sectional study conducted in Maternity teaching hospital in North of Iraq, Kurdistan region, Erbil city from the 15th of August 2008 to the 28th of September 2009, to evaluate the validity of ultrasound estimation of fetal weight. 200 Kurdish, pregnant women with singleton, term, low risk pregnancies were enrolled in the study. Real-time sonography was done to measure femur length and abdominal circumference, and then the weight of the fetus was estimated by Hadlock formula. Immediately after delivery the newborn weight was estimated in the labor ward by the same scale. The correlation between estimated weight and real weight was tested by correlation efficient and linear regression test.
Results: Mean maternal age was 26.625�5.62 years; mean gestational age at time of estimation of fetal weight was 38.825�0.910 weeks. 60% of cases delivered vaginally while 40% delivered abdominally. The mean difference between the predicted and actual weight was 50.810�293.92 gm and this difference was statistically highly significant.
Conclusions: Ultrasound estimation of fetal weight using Hadlock formula is regarded clinically a reliable method to estimate fetal weight as the mean difference between the actual and predicted weights was only 50gm, although the difference was statistically significant
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