Inability to conceive is one of the most common complains in gynecological practice, and a percentage of these cases will eventually seek assisted conception (mainly cases of male factor, tubal factor andunexplained infertility).Ultrasound is a main tool in assisted conception. Currently relieson the use of two-dimensional transvaginal ultrasound, which proved to be better than two-dimensional transabdominal Ultrasound, in monitoring of follicular growth, endometrial growth, ovum pick-up, and embryo transfer.Transvaginal ultrasonography may represent such an ideal non-invasive technique in assessment of uterine receptivity. Several sonographic parameters have been used to assess uterine receptivity, including endometrial thickness, endometrial pattern and endometrial subendometrial and uterine blood flow.