HSG stands for hysterosalpingogram. It is an X-ray test done to evaluate infertile women. A solution of dye is injected through the cervix into the uterus. Pictures are taken as the dye coats the lining of the uterus and flows out through the fallopian tubes. It is used to determine if there are abnormalities in the uterine lining such as polyps and fibroids. An HSG can also determine if there is blockage of the tubes, an important cause of infertility.

The risks of HSG are small, but include infection and injury to the uterus. The main benefit is the diagnostic information obtained about the state of the uterus and tubes so infertility treatment can be planned.

HSG may occasionally treat a tubal blockage by dislodging mucous or other material creating an obstruction. Pregnancy rates are increased during the first few months after women have the test. Although an HSG itself does not cause a woman to miss a period, a pregnancy occurring after an HSG would. You should contact your doctor for an evaluation including a pregnancy test.