An ultrasound of the uterus is a pelvic ultrasound, which is a common test done during a gynecological exam. The cost of a pelvic ultrasound is not very expensive. If the pelvic ultrasound is done through the abdomen, the cost is usually less than$200. If the pelvic ultrasound is done vaginally, it will cost$200-$300, and a 4-D ultrasound of the pelvis will be more expensive and may cost more than$300. Most women are fine with a regular ultrasound, which gives a basic idea of the size and shape of the uterus, as well as the bilateral adnexa. If the results are abnormal, a pelvic MRI is needed to make a definitive diagnosis if necessary.