This x-ray procedure is a study of the uterus and fallopian tubes. During the procedure, contrast dye is introduced into the uterine cavity through a catheter. The dye helps provide clear radiographic images of the areas, especially the patency of the tubes. This test is used to evaluate possible causes of infertility, and provide confirmation of post-Essure sterilization tubal occlusion. The test is performed by one of our doctors alongside a radiologist at the hospital’s radiology department. For infertility testing, days 7-10 of the menstrual cycle are ideal for this procedure, for other purposes the timing of this procedure is not as critical. For an in-depth discussion of an HSG, please visit UpToDate.