How Life IVF Center Uses Saline Sonograms to Shape Precision IVF

A saline sonogram, also called a sonohysterogram or saline infusion sonography (SIS), fills the uterus with sterile saline during a transvaginal ultrasound to reveal polyps, fibroids, scar tissue, or a septum hiding inside the uterine cavity. For fertility evaluation, it matters because these lesions can block implantation or raise miscarriage risk, and SIS finds them with far more clarity than a standard ultrasound. The test is quick, done in-office, and carries a low complication rate.

TL;DR:

• Saline sonograms have a sensitivity of 0.88 and a specificity of 0.94 for detecting uterine cavity abnormalities, making them highly reliable for diagnosis.
• The test should be scheduled early in the menstrual cycle, ideally after the period ends and before day 10, to maximize abnormality detection.
• Most discomfort is comparable to menstrual cramps and resolves quickly, with serious complications being very rare.
• Findings such as polyps, fibroids, or septa usually lead to targeted treatments like hysteroscopic removal, potentially avoiding more invasive procedures.
• SIS primarily assesses the uterine cavity, while HSG evaluates fallopian tube patency, with combined approaches like HyCoSy offering broader diagnostic insights.

Table of Contents

• What Is a Saline Sonogram (SIS/SHG)?
• When and Why Clinicians Order SIS
• When to Schedule Your Test and How to Prepare
• What Happens During the Procedure, Step by Step
• Pain, Risks, and What to Do Afterward
• Reading Your Results: What Findings Actually Mean
• SIS vs. HSG: Which Test Do You Actually Need?
• Where SIS Fits in Your Broader Fertility Workup
• Life IVF Center’s View on Using SIS Within Precision IVF®
• Ready to Talk Through Your Results With a Fertility Specialist?
• Sources

What Is a Saline Sonogram (SIS/SHG)?

During a saline sonogram, a clinician inserts a thin catheter through the cervix and instills sterile saline into the uterine cavity while a transvaginal probe captures real-time images. The fluid separates the uterine walls, so the endometrial lining shows up in sharp contrast against anything that shouldn’t be there.

You’ll hear this test called by several names, and each one emphasizes something slightly different:

• Sonohysterogram (SHG) highlights the ultrasound component paired with fluid distension.
• Saline infusion sonography (SIS) is the technical, most clinically precise term.
• HyCoSy refers to a variation using microbubble contrast to also check whether the fallopian tubes are open.

Plain ultrasound often can’t distinguish a thickened lining from a polyp. Saline changes that by pushing the walls apart, which is why RadiologyInfo’s procedural guide describes SIS as a step up in resolution for uterine cavity abnormalities, all without ionizing radiation.

When and Why Clinicians Order SIS

Clinicians typically order a saline sonogram for one of a handful of clear reasons tied directly to fertility and gynecologic health.

• Infertility workup, especially before starting IUI or IVF, to rule out a structural cause.
• Recurrent pregnancy loss, where a septum or scar tissue may be contributing.
• Abnormal uterine bleeding that needs a cavity-level explanation.
• Pre and postoperative assessment, such as confirming a polyp was fully removed.

The findings that matter most for fertility are endometrial polyps, submucosal fibroids (fibroids that bulge into the cavity rather than the outer wall), intrauterine adhesions from prior surgery or infection, and a uterine septum present from birth. Because SIS is so sensitive to these, it often answers the diagnostic question outright, sparing a patient the trip to the operating room for a purely diagnostic hysteroscopy.

When to Schedule Your Test and How to Prepare

Timing changes what the test can show you, so scheduling isn’t an afterthought.

1. Book it early in your cycle. Cleveland Clinic recommends scheduling after your period ends and before day 10, when the endometrial lining is thin and abnormalities stand out clearly.
2. Take an over-the-counter pain reliever beforehand. Ibuprofen taken 30 to 60 minutes before the appointment blunts cramping for most patients, a step ASRM’s patient guidance also supports.
3. Flag any infection risk. Active pelvic infection is a reason to delay the test, and your clinician may prescribe antibiotics beforehand if you have a history of pelvic inflammatory disease.
4. Confirm you’re not pregnant. A positive pregnancy test rules out this procedure entirely, since instilling saline into a pregnant uterus isn’t appropriate.

What Happens During the Procedure, Step by Step

Knowing the sequence in advance takes most of the mystery out of the appointment.

1. Baseline scan. The clinician performs a standard transvaginal ultrasound first, checking the uterus and ovaries before any fluid is introduced.
2. Speculum and catheter placement. A speculum holds the vaginal walls open while a thin catheter, sometimes with a small balloon tip to keep it seated at the cervix, is guided into the uterine cavity.
3. Saline instillation. Sterile saline flows slowly through the catheter as the transvaginal probe images the cavity distending in real time. If tubal patency is also in question, a clinician may add microbubble contrast for a HyCoSy assessment.
4. Full cavity survey. The probe sweeps across the entire cavity, front to back and side to side, to catch lesions that might sit outside a single view.

Air bubbles introduced during catheter placement are the most common technical pitfall. Trapped air scatters the ultrasound signal and can mimic or obscure a real lesion, a problem detailed in a technique-focused review on sonohysterography.

Pro Tip: *Ask whether your clinician flushes the catheter with saline before insertion.

Pain, Risks, and What to Do Afterward

Most patients describe the discomfort as similar to menstrual cramps, sharpest during the saline instillation and easing within minutes after the catheter is removed. Some brief spotting afterward is normal and typically resolves within a day.

Serious complications are uncommon. ASRM’s patient fact sheet states that serious complications from a saline infusion sonogram, including pelvic infection, are rare. and premedicating with ibuprofen lowers the odds of significant cramping.

After the test, plan for:

• Light rest for the remainder of the day, though most people return to normal activity within hours.
• An over-the-counter pain reliever if cramping continues.
• Panty liner use for a day or two of light spotting.
• A call to your clinic if you develop fever, heavy bleeding, or pain that worsens rather than fades.

Reading Your Results: What Findings Actually Mean

Your report will describe the cavity as either normal or note specific abnormalities, and each finding tends to point toward a different next step.

• Endometrial polyps appear as small, well-defined growths projecting into the cavity, and they’re often removed hysteroscopically before fertility treatment because they can interfere with implantation.
• Submucosal fibroids show up as rounder masses distorting the cavity outline; larger ones sitting close to the endometrial surface may warrant a myomectomy.
• Intrauterine adhesions (sometimes called Asherman’s syndrome) appear as bands or irregular filling defects and usually prompt operative hysteroscopy to restore normal cavity shape.
• Uterine septum presents as a wall dividing part of the cavity, and septum resection is a standard fix when recurrent miscarriage is a concern.

A systematic review and meta-analysis pooled the evidence on this and found SIS has a sensitivity of 0.88 and specificity of 0.94 for detecting uterine cavity abnormalities, which is why a normal SIS often lets your care team skip a diagnostic hysteroscopy altogether and move straight to treatment planning.

SIS vs. HSG: Which Test Do You Actually Need?

Saline sonogram and hysterosalpingogram (HSG) answer overlapping but distinct questions, and the right choice depends on what your clinician needs to see.

• SIS excels at cavity detail. It shows the endometrial lining with high resolution and uses no radiation.
• HSG evaluates the fallopian tubes. It relies on fluoroscopic contrast dye to confirm whether the tubes are open, something standard SIS doesn’t directly test.
• HyCoSy can bridge the gap. Adding microbubble contrast during SIS lets some clinics assess tubal patency in the same visit, an approach described in clinical guidance on sonography for female infertility, though HSG or laparoscopy remains preferred when tubal status needs definitive confirmation.
• The decision often comes down to your history. A patient with no prior pelvic surgery and a straightforward infertility question may only need SIS; someone with suspected tubal disease usually needs HSG as well.

Where SIS Fits in Your Broader Fertility Workup

A saline sonogram is one piece of a larger diagnostic picture, not a standalone answer. It’s typically ordered alongside ovarian reserve testing, a semen analysis for male partners, and ovulation tracking, so your care team can see the full landscape at once rather than chasing one variable in isolation.

What happens next depends entirely on what SIS shows.

• A polyp or submucosal fibroid usually leads to a referral for operative hysteroscopy or polypectomy before treatment begins.
• A septum finding often triggers a conversation about surgical correction, particularly after recurrent loss.
• A normal cavity frequently means your team can move directly toward IUI or IVF planning without additional invasive testing, saving both time and cost. Research on fertility outcomes following SIS-guided polyp removal suggests that clearing these lesions can be a meaningful part of an infertility workup, though results vary by individual case.

Life IVF Center’s View on Using SIS Within Precision IVF®

When a saline sonogram is clinically indicated, Life IVF Center’s team folds those results directly into diagnostic triage rather than treating the test as a box to check. A clear cavity, a polyp, or a septum all point toward different next steps, and that distinction shapes how a Precision IVF® plan gets built around your specific anatomy and history.

Scheduling is coordinated with the rest of your workup, and support resources are designed to make the process and the conversation about what your results mean straightforward.

— Ben

Ready to Talk Through Your Results With a Fertility Specialist?

If you’re staring at test orders, wondering whether a saline sonogram fits into your situation, or you already have results and aren’t sure what they mean for your next step, a consultation is where those questions get answered directly rather than guessed at. Life IVF Center reviews your history, discusses whether SIS or additional imaging makes sense, and builds a Precision IVF® plan around what your uterine cavity actually looks like rather than a generic protocol.

Bring any prior imaging reports, a list of your menstrual cycle dates, and your questions about pain management or timing. SIS is often scheduled as part of a broader initial evaluation, so one visit can cover more ground than you’d expect. You can book a consultation directly through Life IVF Center to get that process started.

This article is general information, not a substitute for advice from a qualified doctor. Consult a qualified healthcare professional about your own circumstances before acting on anything here.

Sources

• Diagnostic accuracy of saline infusion sonography in the evaluation of uterine cavity abnormalities prior to assisted reproductive techniques: a systematic review and meta-analyses
• Sonohysterogram: Procedure, Fertility, Pain & Side Effects
• Sonohysterography – Ultrasound of the Uterus (Saline Infusion Sonography)
• Sonohysterography: Principles, technique and role in diagnosis of endometrial pathology

This article is for general educational purposes only and is not a substitute for personalized medical advice, diagnosis, or treatment. Fertility care is highly individual; please consult a qualified healthcare professional about your specific circumstances.