%0 Journal Article %A Alizadeh, Zohreh %A Nasrolah Zadeh, Batool %T Study of Sonographic Value of Biparietal Diameter as a Parameter for Estimation of Gestational Age in Tehran Mirza Kuchak Khan Hospital and Hamadan Fatemieh Hospital in 1994 %J Avicenna Journal of Clinical Medicine %V 7 %N 1 %U http://sjh.umsha.ac.ir/article-1-953-en.html %R %D 2000 %K Fetal Development / Gestational Age / Ultrasonography, Prenatal, %X Accurate knowledge of fetal age is very important . A number of methods can be used to determine an accurate gestational age . With routin use of ultrasonography more information about the anatomy of the fetus can be obtained . one of the parameter that can be used is biparietal diameter . This study was carried out in 386 pregnant women with known last menstrual period . Regression analysis was performed to evaluate the relationship between biparietal diameter and menstrual age. Regression analysis indicated that menstrual age could be predicted with3.5 weeks with 95% interval confidence.This was also computed for three gestational age interval : 20-26 weeks , 26 - 32 weeks and 32-42 weeks.The results indicated that prediction of age become progressivly less accurate as pregnancy proceed . %> http://sjh.umsha.ac.ir/article-1-953-en. %P 0-0 %& 0 %! %9 Original %L A-11-368-18 %+ %G eng %@ 2588-722X %[ 2000