A HyCoSy, HSG and Aqua scan are not the same thing. Aqua Scan is a Saline Infusion Sonography that assesses the cavity of a patient’s womb. It helps to confirm or exclude things like polyps, cysts or fibroids in the uterus that shouldn’t be there and could potentially affect embryos from implanting. HyCoSy will assess the cavity of your womb but also your tubal patency. Tubal blockage is the cause of infertility in three out of ten couples. HSG is usually done in an x-ray department by a radiologist. This is a test to assess tubal patency using a dye which is visible on x-ray. This test is not available at Herts & Essex Fertility Centre.