What is a sonohysterogram (SIS)?

A Saline Infusion Sonohysterogram (SIS) is a special kind of ultrasound that lets your healthcare provider look inside your uterus and uterine lining for problems that may be causing unwanted symptoms like bleeding and infertility.  SIS is less invasive than surgical procedures such as hysteroscopy and does a better job providing detailed views of structures inside your uterus than standard imaging.

Why would someone need a sonohysterogram (SIS)?

Your provider may ask you to get a SIS if these symptoms exist:

  • Your periods are heavier or longer-lasting than is typical.
  • You have vaginal bleeding in between periods.
  • You’ve had a polyp suspected on prior sonogram.
  • You’ve been unable to get pregnant.
  • You’ve had two or more miscarriages.

A sonohysterogram can reveal these types of structures and conditions:

  • Polyps.
  • Fibroids.
  • Atypical uterus shape.
  • Signs of endometrial cancer.

How do I prepare for a sonohysterogram?

There are time frames and general restrictions on when the imaging can be scheduled and performed.  Your care provider will help to be sure the time is right for the procedure.