Scrotal ultrasound is a painless imaging test that uses sound waves to look at the testicles, epididymis, spermatic cord, and surrounding tissues inside the scrotum. It is one of the most common and useful tests in men’s health because it can help evaluate testicular pain, swelling, lumps, varicocele, hydrocele, trauma, infection, and fertility-related concerns without radiation or surgery.
At a glance: a scrotal ultrasound can show whether a mass is inside or outside the testicle, whether blood flow is normal, and whether there are structural issues that may affect comfort, hormone function, or sperm production. In urgent situations such as possible testicular torsion, it can be a critical test.
Key takeaways
- A scrotal ultrasound is a safe, noninvasive test that uses sound waves to examine the scrotum and testicles.
- It is commonly used for testicular pain, swelling, lumps, suspected torsion, infection, trauma, and fertility evaluation.
- The test does not use radiation and is usually completed within about 15 to 30 minutes.
- Doppler ultrasound can assess blood flow, which is especially important when torsion is a concern.
- Common findings include varicocele, hydrocele, epididymal cysts, inflammation, and testicular masses.
- A normal ultrasound can be reassuring, but symptoms may still need follow-up if they persist.
- Some ultrasound findings can affect fertility, particularly varicocele or testicular damage.
- Sudden severe testicular pain is a medical emergency and should not wait for a routine appointment.
What is a scrotal ultrasound?
A scrotal ultrasound, also called a testicular ultrasound, is an imaging study that evaluates the structures inside the scrotum. The scrotum is the skin sac that holds the testicles. Ultrasound creates images by sending high-frequency sound waves through the tissues and capturing how those waves bounce back.
This test is often used to answer practical questions quickly:
- Is a lump arising from the testicle itself or from nearby tissue?
- Is blood flow to the testicle normal?
- Is there fluid, inflammation, bleeding, or a hernia?
- Could a varicocele be contributing to pain or fertility issues?
Because ultrasound is widely available, relatively inexpensive compared with many other imaging tests, and gives real-time information, it is considered a first-line tool for many scrotal symptoms.
Alternate names you may see
- Testicular ultrasound
- Scrotum ultrasound
- Ultrasound of the testicles
- Scrotal Doppler ultrasound
- Testicular Doppler ultrasound
When the report mentions Doppler, it means the scan also assessed blood flow, not just anatomy.
Why it matters in men’s health and fertility
Many scrotal conditions cannot be reliably diagnosed by symptoms alone. Pain, swelling, and lumps can come from causes that range from harmless to urgent. A scrotal ultrasound helps separate those possibilities.
In men’s health, this matters because the testicles are responsible for two major functions:
- Sperm production, which affects fertility
- Testosterone production, which affects sexual function, energy, body composition, mood, and overall health
Structural problems involving the testicle, epididymis, or surrounding veins and tissues may interfere with one or both functions. For example, a varicocele may be linked with abnormal semen parameters in some men, while trauma or torsion can threaten testicular function more directly.
The test is also important because it can help identify problems that need urgent treatment, especially testicular torsion, which happens when the spermatic cord twists and reduces blood flow to the testicle. Torsion is time-sensitive. Any sudden, severe testicular pain should be treated as an emergency.
When is a scrotal ultrasound ordered?
A clinician may order a scrotal ultrasound when there are symptoms, abnormal exam findings, or fertility concerns.
Common reasons for a scrotal ultrasound
- Testicular pain, especially sudden pain
- Scrotal swelling or a heavy feeling
- A lump or bump in the scrotum
- Possible testicular torsion
- Suspected epididymitis or orchitis (infection or inflammation)
- Varicocele evaluation
- Hydrocele or fluid collection
- Injury or trauma to the testicles
- Follow-up of a previous ultrasound finding
- Male infertility workup
- Undescended testicle history or concern about testicular size
- Monitoring of a testicular mass or concern for tumor
Symptoms that should not be ignored
You should seek prompt medical care if you have:
- Sudden severe pain in one testicle
- Rapid swelling of the scrotum
- Nausea or vomiting with testicular pain
- Redness, fever, or significant tenderness
- A firm new lump in a testicle
- Pain after injury that does not improve
These symptoms do not always mean something dangerous is happening, but they deserve timely evaluation.
What can a scrotal ultrasound show?
A scrotal ultrasound can identify both normal anatomy and many common scrotal conditions. It helps show the size, shape, texture, and blood flow of the testicles and nearby structures.
| Finding | What it means | Why it matters |
|---|---|---|
| Normal testes | Normal size, shape, echotexture, and blood flow | Reassuring, though symptoms may still need follow-up if persistent |
| Varicocele | Enlarged veins in the scrotum, often more obvious on the left | Can be linked with pain, testicular discomfort, or fertility issues in some men |
| Hydrocele | Fluid around the testicle | Often benign but may cause swelling or discomfort |
| Spermatocele or epididymal cyst | Fluid-filled sac near the epididymis | Usually benign and outside the testicle |
| Epididymitis or orchitis | Inflammation or infection of the epididymis or testicle | Often causes pain, swelling, and increased blood flow on Doppler |
| Testicular torsion | Reduced or absent blood flow due to twisting of the spermatic cord | Medical emergency requiring urgent treatment |
| Testicular mass | Solid lesion inside the testicle | Needs prompt urologic evaluation because some masses may represent cancer |
| Hematoma or rupture | Bleeding or structural damage after trauma | May require urgent management depending on severity |
| Microlithiasis | Tiny calcifications within the testicle | Usually incidental; significance depends on broader risk factors |
| Atrophy | Reduced testicular size | May reflect prior injury, torsion, infection, hormone issues, or impaired function |
Structures typically evaluated
- Testicles: size, symmetry, masses, texture, blood flow
- Epididymis: cysts, enlargement, inflammation
- Spermatic cord: torsion-related changes or other abnormalities
- Scrotal sac: fluid collections, swelling, hernia
- Scrotal veins: varicocele or venous reflux
What happens during the test?
Most scrotal ultrasounds are done in an imaging center, radiology department, emergency department, or urology clinic. The test is straightforward and usually does not require special preparation.
Before the ultrasound
- You usually do not need to fast.
- You may be asked to wear or change into a gown.
- It can help to wear comfortable clothing.
During the ultrasound
- You will lie on your back.
- A towel or support may be placed under the scrotum to keep it still.
- Warm or room-temperature gel is applied to the skin.
- A handheld probe called a transducer is moved gently over the scrotum.
- Doppler imaging may be used to evaluate blood flow.
The test is usually not painful, though the area may feel tender if you already have pain or swelling.
How long does it take?
Most scans take about 15 to 30 minutes, though timing varies depending on the reason for the exam and whether urgent findings are being assessed.
Is there any radiation?
No. Ultrasound uses sound waves, not ionizing radiation. That is one reason it is commonly used in reproductive and testicular imaging.
What’s normal vs what’s not?
Scrotal ultrasound reports can sound technical. A normal report generally means the testicles are similar in size, have a uniform appearance, and have normal blood flow, with no mass, abnormal fluid collection, or major vascular issue.
| Ultrasound feature | Usually considered normal | May be abnormal or need follow-up |
|---|---|---|
| Testicular size | Reasonably symmetric and age-appropriate | Marked asymmetry or shrinkage of one testicle |
| Echotexture | Uniform appearance | Focal lesion, irregular area, or heterogeneous tissue |
| Blood flow | Normal arterial and venous flow on Doppler | Reduced, absent, or markedly increased flow depending on the condition |
| Fluid | No significant fluid collection | Hydrocele, hematocele, or other fluid around the testicle |
| Veins | No enlarged scrotal veins | Varicocele, especially with reflux or vein enlargement |
| Masses | No focal solid mass | Intratesticular mass or suspicious lesion |
| Epididymis | Normal size and appearance | Swelling, cyst, inflammation, or tenderness-related changes |
Important nuance: normal does not always mean “nothing is wrong”
An ultrasound can rule out many serious structural problems, but it cannot capture every cause of discomfort or every fertility issue. A man may have normal imaging and still need additional evaluation for:
- Hormonal causes of low testosterone or poor sperm production
- Pelvic floor tension or referred pain
- Nerve-related pain
- Subtle fertility issues only seen on semen analysis or hormone testing
How to understand scrotal ultrasound results
Your report often includes anatomic descriptions, measurements, and comments about blood flow. Here is what common terms usually mean in plain English.
Common report terms
- Homogeneous echotexture: the tissue looks uniform, which is usually reassuring.
- Hypoechoic lesion: an area that appears darker than surrounding tissue. This is descriptive, not a diagnosis.
- Hypervascularity: increased blood flow, often seen with inflammation or infection.
- Absent or decreased flow: concerning for torsion in the right clinical setting.
- Extratesticular lesion: outside the testicle, often more likely to be benign than a lesion inside the testicle.
- Intratesticular mass: inside the testicle; needs prompt evaluation because some intratesticular masses may be cancerous.
- Dilated pampiniform plexus veins: suggests varicocele.
- Complex fluid: fluid that is not simple or clear in appearance; may reflect blood, inflammation, or infection.
How urgent are the results?
The urgency depends on the finding and the symptoms:
- Emergency: suspected torsion, significant traumatic injury, testicular rupture
- Prompt urology follow-up: suspected testicular mass, persistent unexplained abnormality, significant varicocele in the setting of infertility or testicular atrophy
- Routine follow-up: small hydrocele, benign-appearing cyst, stable incidental findings
Scrotal ultrasound findings compared
| Condition | Typical symptoms | Typical ultrasound clue |
|---|---|---|
| Testicular torsion | Sudden severe unilateral pain, nausea, swelling | Reduced or absent testicular blood flow |
| Epididymitis | Gradual pain, tenderness, swelling, sometimes fever | Enlarged, inflamed epididymis with increased blood flow |
| Hydrocele | Swelling, heaviness, often little pain | Fluid around the testicle |
| Varicocele | Dull ache, heaviness, fertility concerns, often none | Enlarged scrotal veins, often worse with standing or Valsalva |
| Testicular tumor | Firm lump, sometimes painless enlargement | Solid intratesticular mass |
| Trauma | Pain after injury, bruising, swelling | Hematoma, contour disruption, or rupture-related changes |
Scrotal ultrasound and male fertility
Scrotal ultrasound is not a direct test of sperm count or sperm quality, but it can reveal structural problems that help explain an abnormal semen analysis or infertility. In male fertility evaluation, ultrasound is especially relevant when a clinician suspects varicocele, testicular atrophy, prior injury, obstruction-related changes, or asymmetry between the testicles.
How ultrasound findings may relate to fertility
- Varicocele: one of the most common potentially correctable findings in infertile men. Not every varicocele causes infertility, but some are associated with reduced sperm count, motility, or morphology.
- Testicular atrophy: smaller testicular size can reflect reduced sperm-producing tissue in some cases.
- Prior torsion or trauma: may affect testicular function depending on severity and timing.
- Inflammation or infection: epididymitis or orchitis can temporarily or sometimes more durably affect fertility, depending on the cause and extent.
- Obstructive clues: although scrotal ultrasound does not diagnose every obstruction, epididymal enlargement or cystic change may sometimes support further evaluation.
What a scrotal ultrasound cannot tell you about fertility on its own
Ultrasound does not replace:
- Semen analysis for sperm count, motility, morphology, and semen volume
- Hormone testing such as testosterone, FSH, LH, estradiol, prolactin, or thyroid tests when indicated
- Genetic testing in selected cases of severe male infertility
- Physical examination by a clinician experienced in male reproductive health
Related tests in a fertility workup
| Test | What it evaluates | Why it may be ordered with scrotal ultrasound |
|---|---|---|
| Semen analysis | Sperm concentration, total count, motility, morphology, volume | Core test for fertility potential |
| Hormone panel | Testosterone, FSH, LH, prolactin, estradiol, others as needed | Helps assess testicular and pituitary function |
| Physical exam | Varicocele, testicular size, vas deferens, signs of hormonal issues | Provides clinical context for imaging findings |
| Transrectal ultrasound | Prostate, seminal vesicles, ejaculatory ducts | May be used when obstruction is suspected |
| Genetic testing | Chromosomal or Y chromosome issues | Used in selected men with severe sperm abnormalities or azoospermia |
Varicocele and fertility: a common reason this test is ordered
A varicocele is a collection of enlarged veins in the scrotum, similar to varicose veins in the legs. It is more common on the left side because of how the veins drain anatomically. Some men with varicocele have no symptoms. Others notice dull pain, heaviness, visible veins, or fertility problems.
Ultrasound may be used to confirm a suspected varicocele, especially if the physical exam is unclear. In the right clinical setting, treatment such as varicocele repair may be discussed, particularly when there is infertility, abnormal semen analysis, pain, or evidence of testicular size loss.
What happens after abnormal findings?
The next step depends on what the ultrasound shows and what symptoms are present.
Possible management pathways
- Urgent surgery or emergency care for suspected torsion or serious traumatic injury
- Antibiotics or anti-inflammatory treatment for infection or inflammation when clinically appropriate
- Observation for benign findings such as small cysts or a mild hydrocele that is not causing problems
- Urology referral for a mass, large hydrocele, bothersome varicocele, persistent pain, or uncertain findings
- Fertility testing if the abnormality may affect sperm production or transport
- Repeat imaging if the finding is not fully clear or needs monitoring over time
When a mass is found
A firm mass inside the testicle deserves prompt evaluation by a urologist. Not every mass is cancer, but solid intratesticular masses are treated seriously until proven otherwise. Additional blood tests or imaging may be ordered depending on the case.
When pain persists despite a normal or near-normal ultrasound
Persistent scrotal pain can still be real and frustrating even when imaging is unrevealing. Follow-up may involve:
- Repeat physical exam
- Urinalysis or STI testing if infection is possible
- Assessment for inguinal hernia
- Consideration of pelvic floor dysfunction or referred pain
- Referral to urology or pain specialists in chronic cases
How to prepare and what to expect after the scan
Preparation is usually minimal, but a few practical steps can make the process easier.
Before your appointment
- Bring your imaging order and insurance information if needed.
- Be ready to describe your symptoms clearly, including when they started and whether the pain was sudden or gradual.
- Tell the care team about recent trauma, infections, fever, or fertility concerns.
- If you have prior imaging or surgery, mention it.
After your appointment
- You can usually return to normal activities right away.
- Results may be discussed immediately in urgent settings, or sent later by the radiologist to your ordering clinician.
- If your symptoms worsen while waiting for results, contact your clinician or seek urgent care.
When to seek medical attention right away
Some scrotal symptoms should be treated as urgent, even before you have imaging.
- Sudden severe testicular pain
- Testicular pain with nausea or vomiting
- Rapid swelling after injury
- Fever and scrotal redness with worsening pain
- A new firm testicular lump
These symptoms can occur with torsion, infection, bleeding, or a mass and should not be brushed off.
Questions to ask your doctor
If you have had a scrotal ultrasound or are about to get one, these questions can help you understand what comes next:
- What exactly are you looking for on the ultrasound?
- Is Doppler blood-flow imaging included?
- Do my symptoms suggest an emergency like torsion?
- Did the scan show anything that could affect fertility or testosterone production?
- If a varicocele was found, is it likely to matter in my case?
- Do I need a semen analysis or hormone testing?
- Should I see a urologist?
- Do I need follow-up imaging?
- If the scan was normal, what else could be causing my symptoms?
Common myths about scrotal ultrasound
Myth: A scrotal ultrasound is only for cancer
False. It is used for many reasons, including pain, swelling, infection, trauma, varicocele, and fertility evaluation.
Myth: If the ultrasound is normal, the pain must be in your head
False. A normal scan rules out many structural problems, but not every cause of pain shows up on imaging.
Myth: Ultrasound can measure sperm count
False. It can identify structural issues that may contribute to fertility problems, but semen analysis is needed to measure sperm parameters.
Myth: The test uses harmful radiation
False. Ultrasound uses sound waves, not radiation.
Myth: Every varicocele found on ultrasound needs surgery
False. Management depends on symptoms, fertility goals, semen analysis, exam findings, and whether the varicocele appears clinically significant.
Related terms and conditions
- Testicular torsion: twisting of the spermatic cord that cuts off blood flow
- Varicocele: enlarged scrotal veins that may affect comfort or fertility
- Hydrocele: fluid around the testicle
- Spermatocele: benign fluid-filled cyst near the epididymis
- Epididymitis: inflammation or infection of the epididymis
- Orchitis: inflammation of the testicle
- Testicular atrophy: reduced testicular size
- Semen analysis: lab test evaluating sperm concentration, motility, morphology, and more
- Male infertility: difficulty achieving pregnancy due to male reproductive factors
Frequently asked questions
Is a scrotal ultrasound painful?
Usually no. It is generally painless, though the area may feel tender if you already have pain or swelling.
How long does a scrotal ultrasound take?
Most exams take about 15 to 30 minutes, but timing can vary depending on the reason for the scan.
Do I need to shave or do special prep before a testicular ultrasound?
Typically no special preparation is needed. You usually do not need to shave, fast, or stop normal activities unless your clinic gives specific instructions.
Can a scrotal ultrasound detect testicular cancer?
It can detect a testicular mass and help determine whether a lesion is inside the testicle, which is important. Ultrasound strongly supports diagnosis, but a full cancer diagnosis depends on specialist evaluation and sometimes additional testing.
Can ultrasound diagnose testicular torsion?
Doppler ultrasound can help identify reduced or absent blood flow, which supports the diagnosis of torsion. However, if torsion is strongly suspected clinically, urgent treatment should not be delayed unnecessarily.
Can a scrotal ultrasound show a varicocele?
Yes. Ultrasound is commonly used to confirm a varicocele and assess the size of the veins and blood-flow changes.
Will a scrotal ultrasound tell me if I am fertile?
No. It can show structural problems that may affect fertility, but it cannot measure sperm count or sperm quality. A semen analysis is the key test for that.
What does “small hydrocele” mean on a report?
It means there is a small amount of fluid around the testicle. This is often benign and may not need treatment unless it causes discomfort or keeps enlarging.
What if my scrotal ultrasound is normal but I still have symptoms?
You may still need follow-up. A normal ultrasound is reassuring, but persistent pain, swelling, or fertility concerns may require further exam, lab testing, or urology review.
Is a scrotal ultrasound the same as a transrectal ultrasound?
No. A scrotal ultrasound looks at the testicles and scrotal structures from the outside. A transrectal ultrasound looks at the prostate, seminal vesicles, and ejaculatory ducts through the rectum and is used for different questions.
References
- American Urological Association. Clinical resources and patient information related to testicular conditions, male infertility, and scrotal pain.
- European Association of Urology. EAU Guidelines on Male Infertility and Urological Infections.
- American College of Radiology. ACR Appropriateness Criteria for acute onset of scrotal pain without trauma and without antecedent mass.
- Radiological Society of North America (RadiologyInfo.org). Scrotal Ultrasound.
- Merck Manual Professional Edition. Evaluation of scrotal masses and acute scrotal pain.
- National Institute of Diabetes and Digestive and Kidney Diseases. Information on varicocele, hydrocele, and male reproductive conditions.
- StatPearls Publishing. Reviews on testicular torsion, epididymitis, varicocele, and scrotal ultrasound interpretation.
