What Is an HSG Test?
An HSG test, short for hysterosalpingography, is a specialized X-ray procedure that examines the uterus and fallopian tubes. This test is primarily used in women to evaluate whether the uterine cavity has a normal shape and whether the fallopian tubes are open or blocked. During the HSG test, a radiopaque contrast dye is injected into the uterus via the cervix. Real-time X-ray images are then taken to monitor the passage of dye through the reproductive structures, helping to diagnose reasons for infertility and guide further treatment.
Key Point: The HSG test is a pivotal screening tool in female fertility evaluation and is commonly ordered early in the assessment of couples having difficulty conceiving.
Key Takeaways
- The HSG test is an X-ray procedure that assesses the structure of the uterus and fallopian tubes.
- It is most frequently used as a diagnostic test for infertility in women.
- The procedure involves injecting a contrast dye and capturing X-ray images as the dye moves through reproductive organs.
- It can detect blocked fallopian tubes or uterine abnormalities that may cause infertility.
- The HSG test is typically scheduled between days 6–12 of a woman’s menstrual cycle.
- Most patients experience only mild discomfort, often similar to menstrual cramps.
- The test is considered safe with low risk, with infection and spotting as rare side effects.
- Results from an HSG test guide further fertility treatment options, such as surgery, medication, IUI, or IVF.
- A normal HSG test helps rule out anatomical causes of infertility, but does not guarantee pregnancy.
- The test may sometimes increase short-term fertility, especially if it flushes out minor blockages in the tubes.
Table of Contents
- What Is an HSG Test?
- Why Is an HSG Test Performed?
- What Does the HSG Test Procedure Involve?
- How Should You Prepare for an HSG Test?
- What Do HSG Test Results Mean?
- How Does the HSG Test Help with Fertility?
- What Does the HSG Test Reveal About Infertility?
- What Can the HSG Test Show About the Uterus and Fallopian Tubes?
- Does the HSG Test Hurt?
- What Are the Risks and Side Effects of an HSG Test?
- How Is the HSG Test Related to Male Fertility?
- What Happens After an HSG Test?
- What Are the Alternatives to an HSG Test?
- Can an HSG Test Boost Your Chances of Getting Pregnant?
- How Much Does an HSG Test Cost?
- Frequently Asked Questions About the HSG Test
- References and Further Reading
- Disclaimer
Why Is an HSG Test Performed?
The HSG test is a cornerstone of female infertility evaluation. It plays several key roles in reproductive medicine:
- Assessing infertility: The HSG is recommended for women who have not conceived after 12 months of regular, unprotected intercourse (or after 6 months if over 35). Tubal factor infertility, meaning issues with fallopian tubes, accounts for about 25–35% of female infertility cases (source).
- Detecting uterine abnormalities: The test can reveal uterine fibroids, polyps, scar tissue (adhesions), or congenital anomalies such as a septate or bicornuate uterus.
- Post-surgical assessment: After procedures like tubal ligation reversal or the correction of uterine defects, an HSG can confirm that tubes remain open and the uterus is normal.
- Investigating recurrent miscarriage: Women with a history of repeated pregnancy loss may undergo HSG to evaluate for structural uterine issues (source).
- Pre-IVF evaluation: HSG is often performed before IVF to ensure that there are no tubal problems (such as hydrosalpinx, a fluid-filled tube) that could lower the chances of success.
Did you know? A normal HSG test result can help redirect focus to other areas in infertility evaluation, such as ovulation, sperm quality, or unexplained infertility.
Quick Facts Table: HSG Test
| Aspect | Details |
|---|---|
| Purpose | Diagnose anatomical issues in uterus and fallopian tubes |
| Who it’s for | Women with infertility, recurrent pregnancy loss, or post-reproductive surgery |
| Procedure time | 15–30 minutes; outpatient |
| Key risks | Mild infection, allergic reaction to dye, temporary cramping, rare complications |
| Preparation needed | Timing with menstrual cycle, possible antibiotics, NSAID recommended |
| Cost (USA) | $500–$3,000 (variable; may have insurance coverage) |
| Male role | Not performed on men, but shapes male infertility evaluation and treatment |
| Next steps | Further imaging, surgery, or fertility treatments as needed |
What Does the HSG Test Procedure Involve?
Step-by-Step HSG Test Walkthrough
- Positioning: You will lie on a fluoroscopy table with your feet in stirrups, similar to a pelvic exam.
- Speculum insertion: A speculum is inserted into the vagina to visualize the cervix.
- Cervical cleansing: The cervix is cleaned with antiseptic to reduce infection risk.
- Catheter placement: A thin tube (catheter) is gently inserted through the cervix into the uterus. Occasionally, a small balloon may anchor the catheter.
- Dye injection: A contrast dye, visible on X-rays, is slowly injected through the catheter, filling the uterine cavity and fallopian tubes.
- X-ray imaging (fluoroscopy): Real-time X-ray images are taken as the dye moves, allowing the radiologist to observe for blockages or abnormal uterine shapes.
- Catheter removal: After imaging, the catheter is withdrawn, and any leftover dye is naturally expelled or absorbed.
The dye injection part lasts only a few minutes. Patients commonly feel a sense of pressure or mild cramping, particularly if a tube is blocked or during dye movement.
Key Point: Proper preparation and open communication with your clinical team can significantly ease anxiety and discomfort during the HSG test (source).
How Should You Prepare for an HSG Test?
Effective preparation helps reduce discomfort and minimize risks.
HSG Test Preparation Checklist
- Cycle timing: Schedule your HSG between days 6–12 of your menstrual cycle (after your period but before ovulation).
- Pregnancy screening: A urine or blood test is typically done to ensure you aren’t pregnant during the procedure.
- Infection screening: You may be screened for STIs (e.g., chlamydia, gonorrhea) since undiagnosed infections can increase risk.
- Antibiotics: Some patients, particularly with a history of pelvic inflammatory disease, may be given prophylactic antibiotics (source).
- Pain relief: Take an NSAID such as ibuprofen 30–60 minutes before the test to help ease cramping.
- Support: Consider bringing a partner or friend for emotional support, especially if you’re anxious about the procedure.
- Attire: Wear comfortable, easily removable clothes. You’ll usually change into a hospital gown.
- Eating: Fasting is generally not required unless otherwise specified by your provider.
Preparation Myths vs. Facts Table
| Myth | Fact |
|---|---|
| You must fast before the test | Most people may eat and drink as usual. |
| All women need antibiotics | Only patients with certain risk factors require antibiotics. |
| The test must be done during your period | It should be done after menstruation but before ovulation. |
| You can't drive yourself home | Most can drive, though support is encouraged. |
| The test always hurts a lot | Most experience only mild, brief discomfort. |
What Do HSG Test Results Mean?
Interpreting HSG test results provides insight into reproductive health and fertility:
-
Normal Results: The uterus appears as a smooth triangular cavity, and the dye flows freely through both fallopian tubes into the pelvis (termed "bilateral spill").
Key Point: Normal HSG findings are reassuring, but they do not rule out all infertility causes—other factors may still play a role.
-
Abnormal Results: These can reveal:
- Blocked fallopian tubes: Dye does not pass through, suggesting scarring, infection, or a congenital issue.
- Hydrosalpinx: A tube is distended and filled with fluid, and dye does not exit the end of the tube.
- Uterine abnormalities: Irregularities such as fibroids, polyps, or tissue adhesions create filling defects.
- Congenital anomalies: Divided or misshapen uterine cavities (e.g., septate, bicornuate uterus).
Further tests like hysteroscopy, sonohysterography, laparoscopy, or MRI may be recommended to clarify or confirm findings (source).
How Does the HSG Test Help with Fertility?
The HSG test provides unique and actionable information for fertility treatment planning:
- Detecting tubal blockages: If the tubes are blocked, options like surgical correction or moving directly to IVF can be considered.
- Finding correctable uterine problems: Uterine polyps and septa, once found, can often be surgically treated to improve fertility outcomes.
- Directing next steps: If HSG is normal, your provider may look for hormonal or male infertility factors.
- Assessing prognosis: Open tubes and a normal uterus often suggest a strong chance of spontaneous pregnancy or success with basic fertility treatments.
- Therapeutic benefit: Flushing the tubes during HSG—particularly with oil-based dye—may temporarily boost pregnancy chances (source).
What Does the HSG Test Reveal About Infertility?
Tubal factor infertility (blockages or dysfunction of the fallopian tubes) is responsible for about 30% of female infertility (source):
Common abnormalities detected by HSG:
-
Tubal blockage due to:
- Previous pelvic inflammatory disease (often from chlamydia or gonorrhea)
- Endometriosis
- Scarring from pelvic or abdominal surgeries
- Ectopic pregnancy history
- Rare congenital malformations
Did you know? The HSG test only shows the inside (lumen) of the tubes—issues outside the tubes, such as adhesions from mild endometriosis, may require laparoscopy for diagnosis.
What Can the HSG Test Show About the Uterus and Fallopian Tubes?
Uterus
- Normal appearance: Smooth, triangular cavity.
-
Abnormalities:
- Submucosal fibroids (block dye flow)
- Polyps (appear as rounded defects)
- Adhesions/Asherman’s syndrome (irregular dye pattern or narrowed cavity)
- Congenital anomalies such as septate or bicornuate uterus
Fallopian Tubes
- Open (patent) tubes: Dye spills freely out the ends.
- Proximal occlusion: Dye doesn’t enter the tube at the uterine side, sometimes due to a muscular spasm.
- Distal occlusion: Dye enters the tube but doesn’t reach the pelvic cavity; possible blockage near the ovary.
- Hydrosalpinx: Tube is distended with fluid; dye does not escape.
- Salpingitis isthmica nodosa: Small outpouchings in the tubes, associated with increased risk of ectopic pregnancy and infertility (source).
Does the HSG Test Hurt?
Most patients report mild to moderate cramping, reminiscent of menstrual pain, mainly during the dye injection. This sensation typically lasts only a few minutes and resolves shortly after the test.
Factors affecting discomfort include:
- Blocked tubes (can cause increased cramping)
- Cervical stenosis or a history of never having delivered vaginally
- Anxiety levels (more anxious patients may experience heightened discomfort, but pain management is possible (source)))
- Use of pain relief medications or local anesthetics, which can lessen pain
Example Scenario:
Maria, nervous about the HSG, took ibuprofen beforehand and discussed pain control with her provider. The procedure was uncomfortable for just a minute, but the strategies made it manageable.
What Are the Risks and Side Effects of an HSG Test?
The HSG test is considered very safe when performed properly, but can have occasional complications:
- Infection: Risk is less than 1–3%, reduced with appropriate antibiotics (source).
- Allergic reaction: Rare, but possible for those with iodine or contrast dye allergies.
- Vasovagal response: Brief faintness, nausea, or dizziness can sometimes occur.
- Radiation exposure: Minimal, similar to a standard diagnostic X-ray.
- Minor bleeding or spotting: Typically resolves the same day.
- Uterine perforation: Extremely rare.
Seek immediate medical attention for fever, severe pain, heavy or persistent bleeding, or foul-smelling discharge after the procedure.
Risks vs. Ways to Reduce Risk Table
| Potential Risk | How to Reduce Risk |
|---|---|
| Infection | Screen for existing infection; use prophylactic antibiotics if indicated |
| Allergic reaction | Inform team about dye allergies |
| Excessive bleeding | Check for bleeding disorders before test |
| Pain/discomfort | Pre-medicate and communicate with your care team |
How Is the HSG Test Related to Male Fertility?
Although the HSG test is not performed on men, its results play a major role in the fertility evaluation of couples:
- If the HSG shows normal uterine and tubal anatomy, diagnosis may shift toward male factor infertility, which is present in up to 50% of cases (source).
- When both partners have contributing factors, HSG helps direct which treatments may be most appropriate.
- Treatment implications: Open tubes allow for procedures like IUI in male infertility cases, while blocked tubes may necessitate IVF.
- In cases of severe male infertility (such as azoospermia—no sperm), providers may proceed directly to IVF with ICSI, sometimes skipping the HSG.
Key Point: Comprehensive fertility testing always includes evaluation of both partners, and HSG results help determine when deeper male investigations are needed.
What Happens After an HSG Test?
- Mild recovery: Most women feel normal within a few hours. Mild cramping, spotting, and watery vaginal discharge may persist for 1–2 days.
- Resuming activities: Normal daily activities and even light exercise can usually resume the same day.
- Sexual activity: Avoid intercourse, tampon use, or vaginal insertion for 24–48 hours, or as instructed by your clinician.
- Follow-up: Your fertility specialist will review results and work with you on next steps. This may include more tests, surgical procedures, or changes to fertility treatment plans.
What Are the Alternatives to an HSG Test?
At times, additional or alternative imaging may be needed:
- Sonohysterography: Saline is injected into the uterus and viewed by ultrasound; excellent for uterine problems, less sensitive for tubes.
- Hysterosalpingo-contrast sonography (HyCoSy): Uses contrast visible to ultrasound; as accurate as HSG, without radiation (source).
- Laparoscopy with chromopertubation: A surgical procedure that is the gold standard for checking tube patency, but requires anesthesia and more recovery.
- Hysteroscopy: Allows direct camera visualization of the uterus, but cannot evaluate the tubes reliably.
- MRI: Best for complex uterine anomalies, but not for routine tube assessment.
Key Point: The HSG test remains the first-line investigation for many patients due to its combination of effectiveness, convenience, and relative affordability.
Can an HSG Test Boost Your Chances of Getting Pregnant?
Some studies suggest there is a short-term fertility boost after an HSG, especially if oil-based contrast is used. For example, in one study, women who had oil-based HSG experienced a 40% pregnancy rate within six months, compared to 29% for water-based HSG (source).
Possible mechanisms:
- Physical flushing away of minor blockages (mucus, debris)
- Temporary improvement in uterine lining receptivity
Did you know? This short-term fertility increase is a “side effect”—the primary purpose of HSG is diagnostic, not treatment.
How Much Does an HSG Test Cost?
- Expected range (U.S.): Usually between $500 and $3,000, depending on location, facility type, and whether additional services are required.
- Insurance: Many health plans cover HSG as part of infertility assessment—always check your plan for deductibles and specific coverage.
- Facility: Hospital-based tests may cost more than those at outpatient centers.
- Added expenses: Charges for antibiotics, sedation, or advanced imaging may increase total cost.
- Dye type: Oil-based contrast can cost more, but may have a greater diagnostic or fertility-boosting impact.
Tip: Ask about payment plans, financial assistance, and less expensive outpatient options if cost is a concern.
Frequently Asked Questions About the HSG Test
What does an HSG test show?
An HSG test reveals the shape of the uterine cavity and whether the fallopian tubes are open or blocked by using X-rays and special dye.
The test is valuable for identifying blockages, anatomic abnormalities, or trauma that could cause infertility. It also helps determine whether surgical intervention or advanced fertility treatments are needed.
Is the HSG test painful?
Most people experience mild cramps similar to those during menstruation; brief, severe pain is uncommon.
Pain can often be minimized with NSAIDs taken beforehand or local anesthetic. Anxiety and blocked tubes may increase discomfort, but most reactions are short-lived and manageable.
How long does an HSG test take?
The total procedure usually takes 15–30 minutes, but the dye injection and imaging phase lasts only a few minutes.
After the test, you'll be observed for a short period to ensure you are comfortable before leaving.
What is the best time in my cycle for an HSG test?
The HSG test should be performed between days 6 and 12 of your cycle—after your period ends but before ovulation.
This timing limits the risk of pregnancy and ensures optimal visibility for the test.
Can I get pregnant after an HSG test?
Yes. There is typically no required waiting period to attempt conception, and some data suggest an increased chance of pregnancy in the first few cycles after the test.
You should follow your doctor’s recommendations regarding timing for intercourse after the HSG.
Do I need antibiotics for an HSG test?
Not all patients need antibiotics; your provider will prescribe them if you have known risk factors (such as history of pelvic infections) or if screening wasn’t done.
Prophylactic antibiotics are used selectively to prevent pelvic infection.
What should I avoid after the HSG test?
You should avoid sexual intercourse, tampons, and inserting anything into the vagina for 24–48 hours.
Also, refrain from swimming or baths for that period unless your doctor advises otherwise.
Does the HSG test use radiation?
Yes, HSG uses a very small dose of radiation—comparable to a routine X-ray.
The exposure is considered safe and well within medical guidelines for reproductive-aged women.
Can the HSG test clear a blocked tube?
Sometimes. Minor blockages, such as mucus plugs, may be dislodged during the test, temporarily improving tube patency.
However, true blockages due to scar tissue or tubal damage generally cannot be resolved by HSG alone.
Will insurance cover my HSG test?
Many insurance plans cover HSG as part of a standard infertility workup, but you should verify coverage details and pre-authorization requirements with your insurance provider.
Out-of-pocket costs can vary, so it pays to check in advance.
How soon will I get my HSG test results?
Preliminary findings may be discussed with you the same day, though formal results and a radiology report often take a few days.
Always follow up with your referring physician or fertility specialist for results interpretation and next steps.
If my tubes are blocked, what are my options?
Depending on the location and cause of blockage, options include surgical correction, IVF, or sometimes assisted procedures like IUI if at least one tube remains open.
Your fertility team will recommend the best next step tailored to your individual findings.
Is the HSG test safe?
Yes, HSG is a safe test with a low risk of complications when conducted by trained professionals (source).
Severe reactions are rare, and most side effects (mild cramping or spotting) resolve quickly.
How is an HSG different from a pelvic ultrasound?
A pelvic ultrasound uses sound waves to examine the uterus and ovaries, but cannot reliably assess whether the fallopian tubes are open.
HSG, by using dye, directly visualizes tubal patency, making it superior for this aspect of fertility evaluation.
Is the HSG test used in men?
No. HSG is performed exclusively in women, but its findings are important for decisions about male factor fertility testing and couple-based care.
For men, direct evaluation focuses on semen analysis and hormonal or structural causes of infertility.
Should my partner be tested if my HSG is normal?
Yes. Regardless of HSG findings, comprehensive fertility assessment always includes male partner testing since male factors are present in up to 50% of infertility cases (source).
A semen analysis and, if needed, further testing should be performed alongside female evaluation.
References and Further Reading
- Practice Committee of the American Society for Reproductive Medicine. Diagnostic evaluation of the infertile female: a committee opinion. Fertil Steril. 2015.
- Practice Committee of the American Society for Reproductive Medicine. Role of tubal surgery in the era of assisted reproductive technology. Fertil Steril. 2021.
- Dreyer K, van Rijswijk J, Mijatovic V, et al. Oil-based or water-based contrast for hysterosalpingography in infertile women (H2Oil trial). N Engl J Med. 2017.
- Strandell A, et al. Hydrosalpinx and IVF outcome: a prospective, randomized multicentre trial. Hum Reprod. 2010.
- Agarwal A, et al. Male infertility. Lancet. 2021.
- Onwuchekwa CR, Oriji VK. Hysterosalpingographic findings and pattern of tubal pathology. Niger J Clin Pract. 2017.
- Maheux-Lacroix S, et al. Hysterosalpingo-contrast sonography compared with hysterosalpingography for diagnosing tubal occlusion. Hum Reprod Update. 2014.
- Liberty G, et al. Lidocaine-prilocaine cream for reducing pain during hysterosalpingography: a prospective randomized study. Hum Reprod. 2007.
- Thinkhamrop J, et al. Antibiotic prophylaxis for transcervical intrauterine procedures. Cochrane Database Syst Rev. 2013.
Organizational Sources:
- American Society for Reproductive Medicine
- ReproductiveFacts.org (Patient education)
- National Institutes of Health – Infertility
Disclaimer
This article is for informational and educational purposes only and does not constitute medical or mental health advice. It is not a substitute for speaking with a qualified healthcare provider, licensed therapist, or other professional who can consider your individual situation.
