Hysterosalpingogram

A hysterosalpingogram, often shortened to HSG, is an imaging test used to examine the inside of the uterus and whether the fallopian tubes are open. It is most commonly used during a female fertility evaluation, but it also matters in men’s health and couple-based fertility planning because a pregnancy depends on both partners being evaluated appropriately. If you are researching infertility, recurrent miscarriage, blocked tubes, or what happens during an HSG test, this guide explains what it is, why it is done, what normal and abnormal results mean, and what next steps may follow.

Table of Contents

1. What Is a Hysterosalpingogram?
2. Why HSG Matters in Fertility
3. What Hysterosalpingogram Means in Men's Health or Fertility
4. When an HSG Is Recommended
5. How the Test Works
6. How to Prepare for an HSG
7. What Happens During the Test
8. Normal vs Abnormal HSG Results
9. HSG Findings and What They May Mean
10. Risks and Side Effects
11. How HSG Findings Can Affect Fertility
12. Treatment and Next Steps After an Abnormal HSG
13. Related Tests and Terms
14. Common Myths and Misconceptions
15. Questions to Ask Your Doctor
16. Frequently Asked Questions
17. References

What Is a Hysterosalpingogram?

A hysterosalpingogram is a special X-ray procedure in which a clinician places contrast dye through the cervix into the uterus to see the shape of the uterine cavity and whether dye spills out of the fallopian tubes. If the dye moves freely through the tubes and into the pelvic cavity, the tubes are generally considered open. If the dye stops, one or both tubes may be blocked.

The name breaks down into its parts:

• Hystero- refers to the uterus
• Salpingo- refers to the fallopian tubes
• -gram means an imaging record

In plain English, an HSG is a test that checks the uterus and fallopian tubes for structural problems that could make conception harder. Major medical centers including the Cleveland Clinic and the NHS describe it as a common part of infertility workups.

HSG at a glance

• It is usually done after menstrual bleeding ends but before ovulation.
• It helps detect blocked fallopian tubes and some uterine abnormalities.
• It is not a sperm test and does not evaluate male reproductive anatomy.
• It is one piece of fertility testing, not the entire answer.
• It may be used before treatments such as IUI or IVF planning.

Why HSG Matters in Fertility

An egg and sperm can only meet naturally if the reproductive pathway is open and functional. Even if ovulation is normal and semen parameters are healthy, a blocked fallopian tube or a uterine cavity problem can reduce the chance of pregnancy. That is why HSG matters: it can identify mechanical barriers that blood tests and semen analysis cannot detect.

Professional guidance from the American College of Obstetricians and Gynecologists includes tubal and uterine assessment as part of infertility evaluation in appropriate patients. HSG is one of the most widely used first-line tests for that purpose.

Key takeaways

• HSG is mainly a test of tubal patency and the uterine cavity.
• It is commonly ordered when a couple has difficulty conceiving.
• It can reveal blockages, scarring, polyps, fibroids, adhesions, or congenital uterine shape differences.
• A normal HSG does not rule out every fertility problem.
• An abnormal HSG does not always mean pregnancy is impossible.
• Some people conceive naturally after HSG, especially if the test clears minor mucus debris or if oil-based contrast is used in selected settings, though this is not guaranteed.
• The male partner still needs a proper fertility evaluation, typically including a semen analysis.

What Hysterosalpingogram Means in Men's Health or Fertility

Hysterosalpingogram is not a test performed on men, but it is still highly relevant in men’s fertility research because conception is a shared process. In real-world fertility care, male factor infertility contributes to a substantial proportion of cases, while female structural issues such as tubal blockage may also be present. That means one partner’s normal test does not eliminate the need to evaluate the other partner.

For men and couples, the practical takeaway is simple: if an HSG is normal but pregnancy still is not happening, the male side of the fertility workup remains essential. The American Society for Reproductive Medicine and other fertility organizations emphasize evaluating both partners rather than assuming the problem is on one side only.

In a couple-based fertility workup

• HSG looks at uterine and tubal factors.
• Semen analysis looks at sperm count, motility, morphology, and volume.
• Ovulation testing looks at whether egg release is occurring.
• Hormone testing may help identify endocrine issues.
• Ultrasound can assess ovarian and uterine anatomy.

When an HSG Is Recommended

A clinician may recommend a hysterosalpingogram when there is concern that the uterus or fallopian tubes could be contributing to infertility or pregnancy loss. It is often ordered after a history review, cycle assessment, and basic fertility labs.

Common reasons an HSG is done

• Infertility, often after 12 months of trying if under 35, or earlier in some circumstances
• Trying to conceive at age 35 or older with fewer months of unsuccessful attempts
• Suspected blocked fallopian tubes
• History of pelvic inflammatory disease
• Previous ectopic pregnancy
• Prior pelvic or abdominal surgery
• Recurrent miscarriage in selected cases to assess uterine cavity shape
• Possible uterine adhesions, polyps, fibroids, or congenital uterine anomalies
• Evaluation before fertility treatment planning

An HSG is generally not done during pregnancy. It may also be delayed or avoided if there is active pelvic infection, unexplained heavy bleeding at the time of the test, or a contraindication to the contrast material.

How the Test Works

The basic idea behind HSG is straightforward: a contrast liquid is placed into the uterus through a thin catheter, then X-ray images are taken in real time. The contrast outlines the uterine cavity and flows into the fallopian tubes if they are open.

What the radiologist or clinician is looking for

• The shape and contour of the uterine cavity
• Whether both fallopian tubes fill with contrast
• Whether contrast spills from the ends of the tubes into the pelvis
• Any areas where the dye stops, pools, or outlines an abnormal shape

This method has been used for decades and remains a standard diagnostic tool. Evidence reviews on tubal assessment and fertility imaging continue to support its role in appropriate patients, including literature indexed at PubMed.

How to Prepare for an HSG

Preparation instructions vary by clinic, but most patients receive guidance on timing, pain relief, and infection precautions. Because the test uses X-ray imaging, it is typically scheduled after menstruation but before ovulation to reduce the chance of performing it during an early pregnancy.

Typical preparation steps

1. Schedule the test in the first half of the menstrual cycle, often after bleeding has stopped.
2. Tell the clinician about any possible pregnancy.
3. Report prior pelvic infections, contrast dye reactions, or iodine allergies.
4. Ask whether to take ibuprofen or another pain reliever before the procedure.
5. Follow any instructions about antibiotics if prescribed.
6. Bring a pad, since spotting or dye leakage can happen afterward.

What to tell your doctor beforehand

• If you might be pregnant
• If you have fever, pelvic pain, or signs of infection
• If you have a history of sexually transmitted infections or PID
• If you have had allergic reactions to contrast agents
• If you have severe endometriosis, recent surgery, or cervical procedures

What Happens During the Test

Many people want to know what an HSG actually feels like and how long it takes. The procedure is usually brief, often around 5 to 15 minutes, though the appointment itself may be longer.

Step-by-step overview

1. You lie on an exam table, usually similar to a pelvic exam position.
2. A speculum is inserted to visualize the cervix.
3. The cervix may be cleaned.
4. A thin catheter is passed through the cervix into the uterus.
5. Contrast dye is slowly injected.
6. X-ray images are taken as the dye fills the uterus and fallopian tubes.
7. The instruments are removed, and you rest briefly.

Some patients feel only mild pressure. Others experience cramping, especially when the contrast is injected or if a tube is blocked. Mild spotting afterward is common. Guidance from the Cleveland Clinic and Johns Hopkins Medicine notes that temporary cramping is expected for some patients.

Normal vs Abnormal HSG Results

HSG results are usually described in terms of whether the uterine cavity looks normal and whether one or both fallopian tubes are open. A “normal” HSG generally means the uterine cavity appears smooth and the dye spills out of both tubes. “Abnormal” can mean many things, from a likely tubal blockage to a cavity irregularity that needs more testing.

What's normal vs what's not?

• Usually considered normal: normal uterine cavity shape, both tubes fill, free spill of dye into the pelvis
• Possibly abnormal: one-sided blockage, both tubes blocked, irregular uterine contour, filling defects, scar tissue pattern, or limited spill
• Needs careful interpretation: tubal spasm, mucus plugs, technical issues, or borderline findings that can mimic blockage

One important nuance: HSG can sometimes suggest a blockage that is not truly permanent. A tube may temporarily spasm during the procedure, especially near the uterine end, creating a false appearance of proximal tubal occlusion. That is why results sometimes need confirmation with repeat imaging, sonohysterography, hysteroscopy, laparoscopy, or fertility specialist review.

HSG Findings and What They May Mean

The table below summarizes common HSG findings. These are general interpretations, not a diagnosis by themselves.

• Results should always be interpreted in the context of symptoms, fertility history, and other tests.
• Some findings affect natural conception more than IVF planning.
• Some abnormalities inside the uterus may be better confirmed with hysteroscopy or saline ultrasound.

Main interpretation table

Comparison table: HSG vs other fertility imaging tests

Risks and Side Effects

HSG is generally considered safe, but no procedure is risk-free. Most side effects are mild and short-lived. The more common issues are cramping, light bleeding, and temporary discomfort.

Possible side effects

• Mild to moderate cramping during or shortly after the test
• Light vaginal spotting
• Temporary pelvic discomfort
• Small amount of dye leakage
• Feeling lightheaded briefly after the procedure

Less common but important risks

• Pelvic infection
• Allergic reaction to contrast material
• Fainting or vasovagal response
• Rare uterine injury
• Radiation exposure, which is low but still why pregnancy must be excluded first

The risk of infection is higher in some patients with prior tubal disease or pelvic inflammatory disease. Patients should contact a clinician promptly for fever, worsening pelvic pain, heavy bleeding, or foul-smelling discharge. Patient information from Johns Hopkins Medicine and the Mayo Clinic outlines these warning signs.

How HSG Findings Can Affect Fertility

The main fertility value of HSG is that it can reveal whether sperm and egg may be physically prevented from meeting or whether implantation could be affected by uterine cavity issues.

Examples of how findings may affect conception

• One blocked tube: pregnancy may still be possible if ovulation and the other tube are functional, but chances may be lower depending on the overall picture.
• Both tubes blocked: natural conception is much less likely without intervention.
• Hydrosalpinx: fluid-filled damaged tubes can impair fertility and may reduce IVF success rates.
• Uterine adhesions or cavity distortion: these may interfere with implantation or increase miscarriage risk in some cases.
• Normal HSG: the cause of infertility may lie elsewhere, such as ovulatory issues, endometriosis, sperm factors, age-related egg quality decline, or unexplained infertility.

Research has also examined whether fertility may improve after HSG itself, particularly when oil-based contrast is used in certain settings. Some studies suggest a short-term fertility benefit in selected patients, but this should not be oversold and practice varies. A large randomized trial indexed in PubMed explored this question.

Treatment and Next Steps After an Abnormal HSG

An abnormal hysterosalpingogram does not point to one universal treatment. The right next step depends on what was seen, whether symptoms are present, how long the couple has been trying, age, semen analysis findings, and whether assisted reproduction is being considered.

Possible next steps after abnormal results

1. Repeat imaging if spasm or technical limitation may have affected the result.
2. Saline sonogram or hysteroscopy to better assess polyps, fibroids, or adhesions inside the uterus.
3. Laparoscopy if endometriosis, adhesions, or tubal disease is suspected and surgical evaluation may change management.
4. Tubal surgery in selected cases, though this is less common than in the past.
5. IVF discussion if both tubes are blocked or hydrosalpinx is present.
6. Treatment of uterine pathology such as removal of a polyp or submucosal fibroid if clinically appropriate.

What if the HSG is normal but pregnancy still is not happening?

A normal HSG means the uterus and tubes appear reasonably open on this test. It does not confirm normal ovulation, egg quality, implantation biology, or sperm function. In that setting, next steps may include:

• Semen analysis and male fertility workup
• Ovulation confirmation
• Hormone testing
• Assessment for endometriosis when symptoms suggest it
• Timed intercourse, IUI, or IVF depending on the broader clinical picture

Related Tests and Terms

If you are reading about HSG, you may also come across other fertility terms. Understanding how they fit together can make a fertility workup easier to follow.

Related tests

• Semen analysis: evaluates sperm count, motility, morphology, pH, and semen volume
• Transvaginal ultrasound: looks at uterus, ovaries, follicles, fibroids, cysts
• Sonohysterogram: saline ultrasound for uterine cavity assessment
• Hysteroscopy: direct visualization inside the uterus
• Laparoscopy: minimally invasive surgery to assess pelvis, endometriosis, and adhesions
• Ovulation testing: checks whether and when ovulation is occurring
• AMH, FSH, estradiol: hormone markers used in ovarian reserve and cycle evaluation

Related terms

• Tubal patency: whether fallopian tubes are open
• Hydrosalpinx: fluid-filled, damaged fallopian tube
• Uterine adhesions: scar tissue inside the uterus
• Submucosal fibroid: fibroid protruding into the uterine cavity
• Endometrial polyp: growth from the uterine lining
• Unexplained infertility: infertility without a clear cause after standard evaluation

Common Myths and Misconceptions

Myth 1: HSG is a fertility treatment

Not exactly. It is primarily a diagnostic test. Some patients may conceive afterward, and some studies suggest a temporary increase in pregnancy rates in specific scenarios, but HSG itself is not a guaranteed treatment.

Myth 2: A normal HSG means there is no fertility problem

False. Fertility depends on more than open tubes. Sperm quality, ovulation, endometriosis, age-related factors, and implantation issues can all matter even when HSG looks normal.

Myth 3: An abnormal HSG means you cannot get pregnant

False. Some abnormalities are treatable, some findings need confirmation, and some patients still conceive with one open tube or with fertility treatment support.

Myth 4: HSG evaluates male fertility

No. It evaluates the uterus and fallopian tubes. Male fertility requires separate testing, most commonly a semen analysis.

Myth 5: HSG always shows the full cause of infertility

No single test does. HSG is useful, but it cannot fully diagnose endometriosis, sperm DNA issues, or every uterine problem.

Questions to Ask Your Doctor

• Why are you recommending an HSG in my situation?
• When in the menstrual cycle should the test be scheduled?
• Should I take pain medicine before the procedure?
• Do I need antibiotics beforehand?
• What findings would change my treatment plan?
• If a tube looks blocked, how will you confirm whether it is real blockage or spasm?
• If the HSG is normal, what tests should come next?
• How does my partner’s semen analysis fit into the overall fertility evaluation?
• If hydrosalpinx or uterine abnormalities are found, what are the treatment options?
• When should I call after the test for pain, fever, or bleeding?

Frequently Asked Questions

Is a hysterosalpingogram painful?

It can cause cramping or pressure, especially when the dye is injected, but the experience varies. Some people have mild discomfort, while others find it more intense but brief.

How long does an HSG take?

The imaging portion is usually short, often around 5 to 15 minutes, although the full visit may take longer.

Can you get pregnant after an HSG?

Yes. Some people conceive in the cycles after the test. That said, HSG does not guarantee improved fertility, and outcomes depend on the underlying cause of infertility.

What does it mean if dye spills from both tubes?

It usually means both tubes appear open, which is generally a normal finding.

Can an HSG be wrong?

Yes. Tubal spasm, mucus, patient discomfort, or technical factors can sometimes make a tube look blocked when it is not. Results may need confirmation.

Does an HSG diagnose endometriosis?

No. It may raise suspicion indirectly in some situations, but it does not diagnose endometriosis reliably. Laparoscopy remains the definitive surgical diagnostic method.

Is HSG done during pregnancy?

No. It should not be performed if pregnancy is possible, which is why timing in the menstrual cycle matters.

What is the difference between HSG and sonohysterogram?

HSG uses contrast dye and X-ray to assess the uterine cavity and tubal patency. A sonohysterogram uses saline and ultrasound, mainly to look at the inside of the uterus.

Why would a man need to know about an HSG?

Because fertility is evaluated as a couple. If a partner is having an HSG, it can identify female tubal or uterine issues while the male partner may need semen testing at the same time.

References

• Cleveland Clinic — Hysterosalpingogram (HSG)
• Johns Hopkins Medicine — Hysterosalpingogram
• Mayo Clinic — Hysterosalpingography
• ACOG — Evaluating Infertility
• NHS — IVF and Fertility Testing Overview
• PubMed — Review literature on tubal patency tests in infertility workup
• PubMed — Trial examining oil-based versus water-based contrast during hysterosalpingography and fertility outcomes
• American Society for Reproductive Medicine — Male Infertility Topic Resources