Prediction of Gestational Age According to Biparietal Diameter

SUMMARY Determination of gestational age have several usages in obstetrics and gynecology. The relation between Biparietal Diameter and gestational age has determined in this research using real time Sonography. 904 Iranian pregnant women between 12-40 weeks of gestation with accuratic last menstrual period and without the history of diabetes mellitus, hypertension, renal disease and Fetal anomalies were examined. They were all singleton. predicted gestational age values in weeks for specific Biparietal Diameter measurements in milimeter were calculated and reported in the form of table and curve. Biparietal diameter was 0.24-4.74 milimeter shorter than Japanese Standards in various weeks of gestation which has a significant statistical difference (P<0.001). In comparing with American too, a significant satistical difference was exist (P < 0.05).