Hysterosalpingography (HSG) and Saline Infusion Sonohysterography (SIS) are two tests employed to investigate the female anatomy of the genital system, often in the setting of infertile couples or abnormal vaginal bleeding. Both techniques entail the introduction of fluid to the uterus to visualise its cavity and fallopian tubes during HSG.On HSG, a radiopaque dye is used with X-ray imaging, whereas on SIS, sterile
saline is also used with ultrasound. The tests will aid in estimating structural defects that can obstruct conception or lead to gynaecological presentation.
Key indications for performing HSG or SIS
Fertility assessment: Both of these procedures are key indications in this area. HSG plays a vital role in measuring the patency of fallopian tubes to understand whether the fallopian tubes are open or blocked, which is essential in natural conception. SIS, however, is more impressive in visualising the uterine cavity to identify minor abnormalities that may hinder embryo implantation.
Recurrent Miscarriage: If a woman has had multiple miscarriages, these tests will be able to diagnose structural abnormalities in the uterus, like polyps, fibroids, intrauterine adhesions (scar tissue), or congenital disabilities (e.g. septate uterus) that may be contributing factors.