الفهرس 
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Abstract
Accurate estimation of GA is the basis of vital decisions in pregnancy and hence its importance in obstetric management. Aim of the work : To assess the correlation of pregnancy outcome with gestational sac volume and embryonic volume at 7-10weeks of gestation. Study plan : This was a prospective observational study carried out on 100 pregnant women with singleton pregnancy that had belonged to7-10 week of pregnancy attending a routine antenatal checkup in outpatient clinic of obstetrics and gynecology department of Mansoura University Hospital, the study extended over one year after obtained the approval from IRB and taking informed consent. Results : CS was the most frequent mode of delivery among the studied cases & EV and GSV were demonstrated to be significant predictors of CRL. CRL=1.55+0.02*GSV+0.08*EV and GSV was displayed to be a significant predictor of fetal birth weight. Fetal birth weight=2.94+0.008*GSV In terms of the adverse outcomes of the studied cases, there was 3 sporadic cases (3%) of cases had adverse pregnancy outcomes in our study : One case of macrosomia (4.5kg) & complicated by (GDM) in which the GSV was higher than 95th percentile & EV in between 75th -95th percentile. Two cases of IUGR (2kg) & one of them complicated by PET and PTL in these case there was discordance between GSV at 5thpercentile and EV at 25th percentile &the other case both GSV&EV at 5th percentile . The GSV and EV reference intervals established in the present study can be used as normal parameters in future studies assessing cases at risk for adverse pregnancy outcomes.