Lab Results · 5 min read · Due Team
What Is a Saline Sonogram and When Do You Need One?
A saline sonogram (SIS or SHG) is a specific uterine imaging test often ordered before IVF or after recurrent loss. Here's what it involves and what it looks for.
A saline sonogram — also called a saline infusion sonogram (SIS) or sonohysterogram (SHG) — is an ultrasound of the uterine cavity performed with saline solution to improve visualization. It's more detailed than a standard transvaginal ultrasound for evaluating the inside of the uterus.
How it works
A small amount of sterile saline is gently introduced into the uterine cavity through a thin catheter. The saline expands the cavity, allowing the ultrasound to clearly visualize the uterine walls and any structures inside. The procedure typically takes 10 to 20 minutes.
What it looks for
- Polyps: Benign growths that can interfere with implantation
- Fibroids: Particularly submucosal fibroids that protrude into the uterine cavity
- Scar tissue (adhesions): Also called Asherman's syndrome
- Uterine shape abnormalities: Septum, bicornuate uterus, or other structural variations
When it's typically ordered
- Before a first IVF cycle, to confirm the uterine cavity is clear
- After recurrent pregnancy loss, to rule out structural causes
- As part of a comprehensive infertility workup
The bottom line
A saline sonogram provides a clearer view of the uterine cavity than a standard ultrasound and is a routine part of many fertility workups. It's a relatively quick procedure that can identify structural issues that are often correctable.
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