Farname Inc. in collaboration with Iranian Society of Gynecology Oncology


Associated Professor, Infertility Fellowship, Department of Obstetrics and Gynecology, Faculty of medicine, Infectious disease and Tropical medicine research center of Zahedan university of medical sciences, Endometriosis Research Center of Iran University of medical Sciences, Tehran, Iran.


: Determining the correct date of pregnancy and fetal age has a very important role in the management of pregnancy from the first trimester to delivery, which is necessary to know the exact method in this field. Therefore, this study aimed to compare the accuracy of ultrasound at 8-16 weeks with Naegel’s Revised Rule of the delivery date.
: This study was performed on 50 pregnant women. After recording demographic information and age of delivery, sonography of weeks 8-16 and Naegel’s Revised Rule were also recorded. Paired t-test was used to compare data.
: The results of our study showed that the average difference between the Naegel’s  Revised Rule and real age was 3.52 days, which is a significant difference. However, the average difference between the estimated date by ultrasound and real age is 0.58 days, which is not a significant difference. Ultrasound is more accurate than the Naegel’s Revised Rule, which still did not differ significantly from the actual date of delivery by grouping by age, sex of the fetus, number of pregnancies, and deliveries.
: Ultrasound has more accuracy in accurately estimating the date of delivery, and therefore using this method and relying on it has more reliability than the Naegel’s Revised  Rule.


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