Abdominal ultrasonography versus transvaginal scanning: Accuracy in follicular development evaluation and prediction for oocyte retrieval in stimulated cycles

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Abstract
Abdominal and vaginal sonographic monitoring were compared in 45 patients undergoing follicular development for the purposes of artificial insemination (N = 22) and in vitro fertilization (IVF; N = 23). Transvaginal sonography recorded a significantly (p < 0.05) higher number of follicles from cycle day 10 on, compared to the abdominal (sector and linear) approach. Starting on day 8, the size of the dominant follicle was also significantly (p < 0.05) higher when transvaginal endosongraphy was used. The number of follicles >15 mm on the day of human chorionic gonadotropin (hCG) administration was correlated with the number of oocytes retrieved in patients undergoing IVF. There was a significant linear correlation when transvaginal (r = 0.86, p < 0.001) and sector (r = 0.57, p < 0.05) scans were used.