How Sonohysterography is Performed
Sonohysterography has two parts. A transvaginal ultrasound exam is done first. Next, a fluid is injected through the cervix into the uterus, and an ultrasound exam is done again.
In a transvaginal ultrasound exam, an ultrasound transducer—a slender, handheld device —is placed in the vagina. It sends out sound waves that are used to make images of the internal organs. These images are shown on a screen.
After the first transvaginal ultrasound exam, the transducer is removed. A speculum is placed in the vagina. It holds the vagina open. The health care provider passes a swab through the speculum to clean the cervix.
Next, a thin tube called a catheter is inserted through the vagina. It is placed in the opening of the cervix or in the uterine cavity. The speculum then is removed.
The transducer is placed in the vagina again. A sterile fluid is slowly passed through the catheter. Cramping may occur as the fluid goes into the uterus. A transabdominal ultrasound exam also may be done while the fluid is passed into the uterus. In this type of ultrasound exam, a transducer is moved over the abdomen.
When the cavity is filled with fluid, ultrasound images are made of the inside of the uterus and the uterine lining.