Hysterosalpingogram or an HSG is procedure that has been a mainstay of fertility testing for decades.
It is regarded as the principle screening study to help determine if the fallopian tubes are patent (open) or occluded. Additionally, an HSG can help determine if the uterine cavity has any filling defects, including fibroids or polyps. Radio-opaque dye is inserted past the cervix and into the uterine cavity while X-ray images are obtained. HSGs are not always accurate, but are considered a very good screening study.