The main purpose of the examination is to further diagnose the uterine adnexa and pelvis, and to find out whether a woman is suffering from uterine diseases. Gynecological ultrasound can better understand whether there are abnormalities in the female reproductive organs, mainly in the uterus, ovaries, pelvis and fallopian tubes. Therefore, it is necessary to drink enough water about half an hour in advance to keep the bladder full, and the bladder needs to be emptied before the examination can be performed through the vagina.