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P03.10: First trimester detection of structural abnormalities; a comparison of 2D/3D ultrasound and virtual embryoscopy

accuracy according to the initial, lower and higher angle was calculated. Cases with wrong fetal assignment were individually analyzed. Results: Overall, 95 cases were included in the analysis. Following online genital angle calculation fetal gender assignment was possible in all but one woman (98.9%) in which the angle fell inside the cut-off (28◦). The assigned gender was correct in 90 of the 95 cases (94.7%). Among the 5 cases with wrong fetal gender assignment 2 cases were < 12 weeks and two cases had an angle calculated from the second volume which fell inside the cut-off (undetermined gender). Using the narrower and higher angle the accuracy of fetal gender determination was 93.7% and 96.8% respectively. Conclusions: 3DUS is a highly accurate tool for fetal gender assignment in the first trimester. A second look may have a role in reducing the margin of error in fetal gender determination. In case of discrepancy the wider angle seems to perform better.