SIS (saline infusion sonography)

Ultrasound is the technology of conducting sound waves through the body tissues.  The waves bounce back to the probe that transmits them and then are converted to light form to get a visual image.

While many people think of ultrasound as a tool to monitor pregnancy, pelvic ultrasound is very useful for assessing the female reproductive organs to determine the cause of pain, bleeding, bloating, pelvic pressure, or loss of periods.  It is useful to evaluate masses felt by your provider during pelvic exam, or to screen for cancer of the reproductive organs when there is a family history.


Ultrasound can also help in monitoring medication responses or to determine congenital defects of the pelvic organs.  Your provider can make diagnoses for your problems by utilizing ultrasound to check structure and other tests to check function of pelvic organs.  At Northwest Women’s Health Care, where your ultrasound is performed by a specially trained Nurse Practitioner sensitive to your comfort and concerns, you get an interpretation of the findings at the time of the ultrasound study!




Northwest Women’s Healthcare  |  75 Claremont Street  |  Suite A  |  (406)752-8282  |  Kalispell, MT 59901-3500

TERMS & CONDITIONS:  This information is not intended to be medical advice. It is general health information and does not take into account your particular health status nor is it a substitute for personal medical care. If you are suffering from a medical condition or have any specific questions about any medical matter, consult your doctor or other professional healthcare provider. Northwest Women’s Health Care shall not be liable for any damages arising out of the use of the content herein.

Saline infusion sonohysterography refers to a procedure in which fluid is instilled into the uterine cavity transcervically to provide enhanced endometrial visualization during transvaginal ultrasound examination. The technique improves sonographic detection of endometrial pathology, such as polyps, hyperplasia, cancer, leiomyomas, and adhesions. In addition, it can help avoid invasive diagnostic procedures in some patients as well as optimize the preoperative triage process for those women who require therapeutic intervention. It is easily and rapidly performed at minimal cost, well-tolerated by patients, and is virtually devoid of complications. The American College of Obstetricians and Gynecologists, in conjunction with the American College of Radiology and the American Institute of Ultrasound in Medicine, developed a technology assessment document for saline infusion sonohysterography.


Saline infusion sonography is done in the office by instilling a small amount of Sterile normal saline into the uterine cavity and then visualization by the ultrasound.  The advantage over traditional transvaginal pelvic ultrasound is the structural abnormalities of the lining of the uterus (called the endometrium) are easier to visualize.


This procedure is best performed early in the menstrual cycle if possible (at the very end of your period or right after you have stopped bleeding).  If you are having abnormal bleeding and/or your cycles are not dependable, that will not interfere in proceeding with the test, unless you are having heavy flow of blood.