There are two main types of ultrasonography in gynecology: transabdominal and transvaginal ultrasound. During a transabdominal ultrasound, the health care provider applies a gel on the lower abdomen and moves a handheld device called a transducer over the area. In a transvaginal ultrasound, a specially designed transducer is inserted into the vagina to obtain more detailed images of the pelvic organs.