The standardized name for vaginal ultrasound is vaginal ultrasound, which is generally not recommended during menstruation, when one is in the midst of endometrial stripping and bleeding, and a vaginal ultrasound may increase the risk of infection. However, if the patient has abnormal vaginal bleeding, such as suspected miscarriage, ectopic pregnancy, uterine bleeding, etc., it is necessary to do the examination vaginal ultrasound. The purpose of the examination is to observe the size and shape of the uterus, the thickness of the endometrium, the inflammation of the fallopian tubes as well as the number of sinusoidal follicles in the ovaries bilaterally, and to determine the reserve function of the ovaries, so that the growth and development of the ovarian eggs can be predicted at the time of ovulation. If a patient wants to have a vaginal ultrasound during menstruation, it is necessary to be evaluated by an obstetrician/gynecologist at the hospital.