Sonohysterogram

A sonohysterogram is a specialized ultrasound test used to look closely at the inside of the uterus. It is also called saline infusion sonography or SIS. During the test, a small amount of sterile saline is placed into the uterus through a thin catheter, which helps the uterine cavity open slightly so polyps, fibroids, scar tissue, or structural abnormalities can be seen more clearly than on a standard pelvic ultrasound. While this is a test performed in women, it matters in men’s health and fertility too because male partners are often part of a couple’s fertility workup and may be trying to understand what this test means, why it is ordered, and how abnormal findings could affect conception, miscarriage risk, and treatment planning.

What Is a Sonohysterogram?
Quick Takeaways
Why the Test Is Done
How a Sonohysterogram Works
What It Can Show
Normal vs Abnormal Results
Sonohysterogram vs Other Tests
Fertility Implications
Preparation and Timing
What to Expect During the Test
Risks, Side Effects, and Recovery
Who Should Not Have It?
Questions to Ask Your Doctor
Related Tests and Terms
Common Myths
FAQs
References

What Is a Sonohysterogram?

A sonohysterogram is an imaging test that combines transvaginal ultrasound with sterile saline placed into the uterine cavity. The fluid outlines the inner lining of the uterus, called the endometrium, making subtle abnormalities easier to detect. This technique is widely used during infertility evaluations, abnormal uterine bleeding workups, and before some fertility treatments.

You may also see it called:

Saline infusion sonography
Saline sonogram
SIS ultrasound
Sonohysterography

Major medical organizations and academic centers describe saline infusion sonography as a useful way to assess the uterine cavity, especially when standard ultrasound does not fully explain symptoms or fertility problems, including information from the American College of Obstetricians and Gynecologists and radiology references from the NCBI Bookshelf overview of saline infusion sonography.

At a glance, this test helps answer one core question: is there anything inside the uterus that could interfere with implantation, pregnancy, or normal bleeding?

Quick Takeaways

A sonohysterogram is a uterine cavity ultrasound done with sterile saline.
It is commonly used to investigate infertility, recurrent miscarriage, and abnormal bleeding.
It can help detect uterine polyps, submucosal fibroids, scar tissue, adhesions, and some congenital uterine abnormalities.
It is different from a standard pelvic ultrasound because saline improves visibility inside the uterus.
The test is usually scheduled after menstruation but before ovulation.
Mild cramping and light spotting afterward are common; serious complications are uncommon.
For couples trying to conceive, abnormal findings may change treatment plans and improve fertility care when addressed appropriately.

Why the Test Is Done

A sonohysterogram is ordered when a clinician needs a better look at the uterine cavity than a routine pelvic ultrasound can provide. It does not evaluate sperm, semen, or male hormones directly, but it can be highly relevant when a couple is trying to conceive and the female partner’s uterus may be part of the picture.

Common reasons a sonohysterogram is performed include:

Infertility evaluation
Recurrent pregnancy loss or recurrent miscarriage
Abnormal uterine bleeding
Suspected uterine polyps
Suspected fibroids that may distort the cavity
Possible intrauterine adhesions or scar tissue
Assessment of the endometrial cavity before IVF or embryo transfer
Clarifying abnormal findings seen on standard ultrasound

According to reviews available through PubMed on uterine cavity assessment in infertility, abnormalities inside the uterine cavity may reduce the chance of implantation or increase the risk of bleeding and pregnancy complications, depending on the specific finding.

How a Sonohysterogram Works

The test works by using saline to create contrast inside the uterus. On a regular transvaginal ultrasound, the walls of the uterus may sit close together, which can make small lesions hard to identify. Saline gently separates those walls so the endometrial contour becomes easier to inspect.

The typical process looks like this:

A speculum is placed into the vagina, similar to a Pap test.
The cervix is cleaned.
A thin catheter is passed through the cervix into the uterus.
The speculum is removed.
A transvaginal ultrasound probe is inserted.
Sterile saline is slowly infused into the uterine cavity.
The clinician captures ultrasound images while the cavity is outlined by fluid.

Some practices may combine this with evaluation of fallopian tube patency, though that becomes a different or expanded procedure depending on the technique used.

What It Can Show

A sonohysterogram is best known for showing abnormalities inside the uterus. It can help identify whether the cavity is smooth and open or whether something is projecting into it.

Common findings

Endometrial polyps: Small growths from the uterine lining that may cause bleeding or interfere with implantation.
Submucosal fibroids: Fibroids that bulge into the uterine cavity and can affect fertility more than fibroids located entirely within the uterine wall or outside the uterus.
Intrauterine adhesions: Scar tissue, also called Asherman syndrome when extensive.
Congenital uterine anomalies: Structural differences such as a septate uterus in some cases.
Endometrial irregularities: Thickening, contour changes, or focal lesions.
Retained products or cavity defects: In selected situations after pregnancy-related events or procedures.

Evidence from the American College of Radiology Appropriateness Criteria on abnormal uterine bleeding and reviews indexed in PubMed on sonohysterography accuracy supports the value of this test for intracavitary lesions.

What it does not do well

It does not replace semen analysis in a male fertility evaluation.
It does not directly measure ovulation or ovarian reserve.
It does not fully replace hysteroscopy when direct visualization or treatment is needed.
It is not designed to diagnose every cause of infertility.

Normal vs Abnormal Results

Unlike blood tests, a sonohysterogram does not have a numeric normal range. Instead, results are interpreted based on whether the uterine cavity appears normal in shape and contour or whether a structural abnormality is present.

What’s normal vs what’s not?

Usually considered normal: A smooth uterine cavity without masses, major contour distortion, or obvious adhesions.
Potentially abnormal: Polyps, fibroids that distort the cavity, septum, scar tissue, focal thickening, or irregular endometrial architecture.

Interpretation guide

Here is a simple way to think about results:

Normal study: Reassuring, but it does not rule out every fertility issue.
Polyp seen: May prompt hysteroscopic removal, especially in infertility or abnormal bleeding.
Submucosal fibroid seen: May warrant specialist discussion because cavity-distorting fibroids can affect implantation and bleeding.
Adhesions seen: May require hysteroscopy for confirmation and treatment.
Unclear finding: Further imaging or hysteroscopy may be recommended.

Results overview

Normal cavity shape and lining contour often support moving ahead with other fertility testing or treatment.
Abnormal findings may explain symptoms, failed implantation, or recurrent pregnancy loss in some patients.
Whether a finding requires treatment depends on size, location, symptoms, and fertility goals.

Sonohysterogram vs Other Tests

Many people confuse sonohysterogram with transvaginal ultrasound, hysterosalpingogram, or hysteroscopy. They overlap, but they are not the same.

Comparison overview

Different tests answer different questions:

Transvaginal ultrasound: General pelvic imaging of the uterus and ovaries.
Sonohysterogram: Better detail of the uterine cavity.
Hysterosalpingogram (HSG): X-ray test that focuses on the uterus and whether the fallopian tubes are open.
Hysteroscopy: Direct camera-based inspection of the uterine cavity, often with ability to treat abnormalities during the same procedure.

Comparison table

Below is a practical side-by-side summary.

Test: Standard pelvic ultrasound
Best for: General uterus and ovary assessment
Can detect cavity lesions well? Sometimes, but less clearly
Treatment possible during test? No
Test: Sonohysterogram
Best for: Inside of the uterine cavity
Can detect cavity lesions well? Yes, often better than standard ultrasound
Treatment possible during test? No
Test: HSG
Best for: Tubal patency and uterine outline
Can detect cavity lesions well? Sometimes, but less detailed than direct cavity-focused methods
Treatment possible during test? No
Test: Hysteroscopy
Best for: Direct visualization of uterine cavity
Can detect cavity lesions well? Yes
Treatment possible during test? Yes

Guidance from the ACOG hysteroscopy overview and infertility resources from the American Society for Reproductive Medicine patient resources help explain how these tests fit together.

Fertility Implications

For couples trying to conceive, the key fertility question is whether the uterine cavity can support implantation and pregnancy. A sonohysterogram can help answer that.

Why it matters in infertility

Even if semen analysis, ovulation, and hormone tests are normal, pregnancy may still not happen if the embryo cannot implant properly. Structural uterine problems are one possible reason. A sonohysterogram is often used before intrauterine insemination, IVF, or after repeated unsuccessful conception attempts to check for barriers inside the uterus.

Research and professional guidance suggest that intracavitary lesions such as polyps, submucosal fibroids, and adhesions may negatively affect fertility in some patients, and treatment may be considered based on the situation, as discussed in PubMed reviews on uterine factors in infertility.

What male partners should know

This test does not evaluate male fertility directly.
It is still highly relevant if you are part of a couple’s fertility workup.
An abnormal uterine finding does not mean male factors are excluded; both partners may still need complete evaluation.
If an abnormality is found and treated, it may improve the overall fertility plan, though outcomes depend on many factors including age, embryo quality, sperm quality, and underlying diagnoses.

Can treatment help?

Sometimes, yes. If the sonohysterogram shows a treatable problem such as a cavity-distorting polyp or submucosal fibroid, a fertility specialist may recommend hysteroscopic removal. The effect on pregnancy rates varies by lesion type and patient context, so treatment decisions should be individualized rather than assumed.

Preparation and Timing

Timing matters. A sonohysterogram is usually done after menstrual bleeding has ended but before ovulation. This reduces the chance of performing the test during an early pregnancy and often allows the endometrial cavity to be seen more clearly.

How to prepare

Schedule the test for the time window your clinician recommends, often in the first half of the cycle.
Tell your clinician if there is any chance of pregnancy.
Mention a history of pelvic infection, severe cervical stenosis, latex allergy, or prior difficult procedures.
Ask whether you should take an over-the-counter pain reliever beforehand, if appropriate for you.
Clarify whether antibiotics are needed. They are not routine for everyone, but may be considered in selected situations.

Before the appointment, ask about:

Whether to avoid intercourse before the test
Whether you should eat normally
Whether you can return to work the same day
Whether mild spotting afterward is expected

The Cleveland Clinic overview of sonohysterogram and patient-facing fertility center instructions often reflect this timing and preparation approach.

What to Expect During the Test

Many patients want to know one thing first: does a sonohysterogram hurt? For most people, it causes brief discomfort or cramping rather than severe pain, but experiences vary.

Typical experience

The procedure often takes around 15 to 30 minutes.
You will usually lie on an exam table as you would for a pelvic exam.
A thin catheter is inserted through the cervix.
Saline infusion may trigger period-like cramping.
The cramping often eases once the test is over.

What patients commonly feel

Mild to moderate cramping
A sensation of pressure
Light fluid leakage afterward
Light spotting for a short time

Severe pain is not typical. If pain is intense, the clinician may pause, adjust the technique, or assess for another issue.

Risks, Side Effects, and Recovery

A sonohysterogram is generally considered a low-risk procedure, but no medical test is risk-free.

Common short-term effects

Mild cramping
Light spotting
Watery discharge as saline leaks out

Less common risks

Pelvic infection
Vasovagal symptoms such as lightheadedness
Difficulty passing the catheter through the cervix
Rare worsening pain requiring evaluation

According to patient guidance from institutions such as the Mayo Clinic sonohysterography overview, serious complications are uncommon. Still, patients should know the warning signs.

Call a clinician promptly if there is:

Fever
Heavy bleeding
Foul-smelling discharge
Severe or worsening pelvic pain
Symptoms that do not improve after the procedure

Recovery

Most people return to normal activity the same day. A pad may be helpful for saline leakage or spotting. Recovery is usually quick.

Who Should Not Have It?

A sonohysterogram is not appropriate in every situation.

It is commonly avoided or postponed if:

Pregnancy is possible or confirmed
There is an active pelvic infection
There is unexplained severe pelvic pain that needs another workup first
There is heavy uterine bleeding that would make the study hard to interpret

If there is concern for infection, pregnancy, or another complication, clinicians usually address that first before proceeding.

Questions to Ask Your Doctor

If this test has been recommended, these questions can make the discussion more useful:

Why are you recommending a sonohysterogram instead of a regular ultrasound alone?
What are you specifically looking for in my case?
When in the menstrual cycle should the test be scheduled?
Should I take anything for cramping before the appointment?
If you find a polyp, fibroid, or scar tissue, what would the next step be?
Could the finding affect fertility, miscarriage risk, or IVF planning?
Would hysteroscopy be needed after this test?
Are there any reasons I should avoid the procedure?

For couples in fertility care, it is also reasonable to ask how this test fits with semen analysis, ovulation tracking, ovarian reserve testing, and tubal evaluation.

Several related terms often appear during a fertility or gynecology workup. Understanding them can make a sonohysterogram report easier to follow.

Transvaginal ultrasound: Standard internal ultrasound of the uterus and ovaries.
Hysterosalpingogram: X-ray dye test that checks the uterine outline and whether the fallopian tubes are open.
Hysteroscopy: A camera-based procedure used to inspect and sometimes treat the uterine cavity.
Endometrium: The lining of the uterus.
Endometrial polyp: A growth from the uterine lining.
Submucosal fibroid: A fibroid that projects into the uterine cavity.
Intrauterine adhesions: Scar tissue inside the uterus.
Septate uterus: A congenital uterine anomaly involving a tissue partition.

Common Myths

Myth: A sonohysterogram is the same as a regular ultrasound.

Not exactly. Both use ultrasound, but the saline infusion in a sonohysterogram improves visualization of the uterine cavity.

Myth: A normal sonohysterogram means there is no fertility problem.

No. It only evaluates one part of the fertility picture. Ovulation, egg quality, sperm factors, tubal status, hormones, and timing still matter.

Myth: If something abnormal is found, pregnancy is impossible.

Also no. Many uterine findings are treatable, and some abnormalities have limited impact depending on their size and location.

Myth: The test is always very painful.

For most patients, discomfort is brief and manageable, though individual experiences vary.

Myth: Men do not need to understand this test.

If you are part of a couple trying to conceive, understanding your partner’s uterine evaluation is part of understanding the full fertility picture.

FAQs

Is a sonohysterogram painful?

Usually it causes mild to moderate cramping rather than severe pain. Some people feel only brief discomfort, while others are more sensitive.

How long does a sonohysterogram take?

The procedure itself often takes about 15 to 30 minutes, though appointment times may be longer.

What is the difference between a sonohysterogram and HSG?

A sonohysterogram uses ultrasound and saline to examine the uterine cavity. An HSG uses X-ray contrast to look at the uterus and whether the fallopian tubes are open.

Can a sonohysterogram detect blocked tubes?

Not reliably in its standard form. Some modified ultrasound-based techniques can assess tubal patency, but a traditional sonohysterogram mainly focuses on the uterine cavity.

Why would a fertility doctor order a sonohysterogram?

To check for uterine abnormalities such as polyps, fibroids, or scar tissue that could affect implantation, bleeding, or miscarriage risk.

Can you get pregnant the same cycle after a sonohysterogram?

Often yes, depending on the timing and your clinician’s advice. The test is usually scheduled before ovulation, but follow your care team’s instructions.

What happens if the sonohysterogram is abnormal?

The next step may include hysteroscopy, additional imaging, or treatment planning depending on what was found.

Does a normal sonohysterogram mean IVF will work?

No. A normal uterine cavity is helpful, but IVF success depends on many factors including embryo quality, age, sperm quality, and overall reproductive health.

Can this test cause infection?

Infection is possible but uncommon. Fever, worsening pelvic pain, or foul-smelling discharge after the test should prompt medical attention.

Is a sonohysterogram relevant to male fertility?

Indirectly, yes. It does not assess sperm or hormones, but it can identify uterine issues that affect a couple’s ability to conceive or carry a pregnancy.