بررسی سن جنین براساس اندازه گیری طول استخوان ران در مراکز آموزشی و درمانی دانشگاه علوم پزشکی ایران طی سالهای 1378 لغایت 1379

ABSTRACT The selection of this subject is, because of the importance of determination of fetal age for evaluation of the fetal growth and preventing of complication due to preterm delivery, prolonged pregnancy and the absent of the complete conforming of refrence table in this case is by the measure of Iranian fetus, particular in the third trimester. This study which is descriptive and prospective, it has exactly been done for one year in 817 pregnancies (in the second and third trimester) by certain date LMP (last menstrual period). In this study the femur length was measured by real time sonography system by 3/5-5 MHZ probe and then the fetal age was calculated by the use of LMP, then the central indexes and dispersion of obtained data was calculated, and the final forcasting fetal age, was used based on the obtained measures from the way of linear regression statistical and at last the obtained results was compared with Hadlock study result. The obtained results contain the femur length in the fetus of this study is compatible with study of hadlock to 22 week and shorter than fetus under studying of Hadlock from 22 week to term. In attention to the above findings, it is suggested to use of the obtained table from this study to determain Iranian fetus age.