Abstract
Ultrasoud assessment of the fetus during pregnancy is an essential part of antenatal care. Ultrasonographic measurements of fetal parts can be used to assess fetal size and growth and also diagnose growth restriction of the fetus. This condition needs special follow-ups and surveillance due to increased risk of perinatal mortality and morbidity. There are several formulas to estimate the fetal weigth and the birthweight. Fetal weight estimation during pregnancy is important for several reasons and has an essential clinical value in making decisions, such as method and time of delivery. The aim of this project was to study available literature to understand several aspects of fetal growth assessment, estimation of fetal weight and growth restriction in the fetus. I tried to search for clinical studies and reviews to assess the accuracy of fetal weight estimation in predicting the actual birthweight. I have used two systematic reviews and some clinical studies for this purpose. Results: There are considerable differences in fetal weight estimated by different formulas. Hadlock A formula had the lowest mean systematic error according to a systematic review from 2018. Hadlock D was the most appropriate formula to estimate birthweight in SGA-fetuses in a subgroup study of SGA-fetuses. Conclusions: Many systematic and random errors can reduce the accuracy of EFW. In general, many formulas overestimate fetal weight compared to the actual birthweight, especially when it comes to the fetuses who are growth restricted or have low birth weight.