Prediction of Gestational Age According to Fetal Femur Length

SUMMARY Determination of gestational age have several usages in obstetrics and gynecology. The relation between fetal femur length and gestational age has determined in this research using real time sonography. 1000 iranian pregnant women between 12-40 weeks of gestation with accuratic last menstrual period and with out the history of diabetes lllellitus, hypertension, renal disease and fetal anomalies were examined. They were all singleton. Predicted gestational age values in weeks for specific femur length measurements in millimeter were calculated and reported in the form of table and curve. Fetal femur length was 3-6 millimeter shorter than American Standards in various weeks of gestation which has a significant statistical difference (P < 0/001). In comparing with Japanese too, a significant statistical difference was exist (P < 0/09).