Purpose: Determine if the evaluation of endometrium one week after embryo transfer can predict pregnancy.
Methods: Endometrial volume and thickness were evaluated by three-dimensional ultrasound in 40 patients one week after embryo transfer. These results were compared to serum pregnancy test performed one week later.
Results: Eighteen patients have achieved pregnancy. A significant difference was found for endometrial volume: 6.49±1.97 mL versus 3.40±1.11 mL (pregnant versus not pregnant); and thickness: 11.15±2.75 mm versus 9.77±1.85 mm. The ROC curve was used to detect the best cutoff values: endometrial volume of 3.48 mL (sensitivity-100%, specificity-68.2%) and endometrial thickness of 10.3 mm (sensitivity-72.2%, specificity-77.3%). The area under curve was significant higher for endometrial volume (0.909 versus 0.745, p=0.027). No pregnancy was achieved in women who had an endometrial volume <3.8 mL (15 patients) or thickness <7.9 mm (3 patients).
Conclusions: The endometrial volume and thickness were significant higher in pregnant women and this difference was more prominent for endometrial volume.
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