Hysterosalpingogram (HSG)

Test Overview

A hysterosalpingogram (HSG) is an X-ray test. It looks at the inside of the uterus and fallopian tubes and the area around them. It may be done if you are having a hard time getting pregnant (infertility).

During the test, a dye (contrast material) is put through a thin tube. That tube is put through the vagina and into the uterus. Because the uterus and the fallopian tubes are connected, the dye will flow into the fallopian tubes. Pictures are taken using a steady beam of X-ray (fluoroscopy) as the dye passes through the uterus and fallopian tubes. The pictures can show problems such as an injury or abnormal structure of the uterus or fallopian tubes. They can also show a blockage that would prevent an egg moving through a fallopian tube to the uterus. A blockage also could prevent sperm from moving into a fallopian tube and joining (fertilizing) an egg. The test also may find problems on the inside of the uterus that affect fertility.