Sonohysterogram (aka SIS or Saline Infusion Sonogram)

The sonohysterogram is a test that examines the uterine cavity and is sometimes done in lieu of or in conjunction with the HyFoSy test.

Fluid is put into the uterus through the cervix using a very small catheter. Sound waves are then used to create images of the lining of the uterus. Remember, that the uterus is normally collapsed on itself, so the fluid helps to open up that space and show more detail of the inside of the uterine cavity than when ultrasound is used alone.