How Is Endometriosis Diagnosed?

If you think you may have endometriosis, one of the first questions you may have is:

How do I actually find out if I have it?

You may expect there to be one blood test, ultrasound, or scan that gives you a clear yes-or-no answer.

Endometriosis diagnosis isn't always that simple.

Your symptoms, health history, physical exam, imaging, response to treatment, and sometimes surgery can all play a role in understanding what may be causing your pain.

And importantly, a normal ultrasound doesn't always rule out endometriosis.

What is endometriosis?

Endometriosis occurs when tissue similar to the lining of the uterus is found outside the uterus.

It can be associated with symptoms such as:

Painful periods
Chronic pelvic pain
Pain during or after sex
Painful bowel movements
Pain with urination
Heavy menstrual bleeding
Difficulty becoming pregnant

Symptoms can vary significantly from person to person.

That's one reason diagnosis may require looking at the full pattern rather than relying on one symptom or one test.

Is there a test for endometriosis?

There isn't currently one simple blood test that can confirm or rule out endometriosis.

The diagnostic process often begins with your symptoms and medical history.

In 2026, ACOG released updated guidance emphasizing that doctors may make a presumptive clinical diagnosis of endometriosis based on history, symptoms, examination findings, and imaging without requiring every patient to undergo surgery before treatment begins.

That means the first step is often talking carefully about what you're experiencing.

What symptoms may make a doctor suspect endometriosis?

Your provider may ask detailed questions about your pain.

For example:

When did the pain begin?
Does it worsen before or during your period?
Does it interfere with work, school, exercise, or sleep?
Is sex painful?
Do bowel movements become painful around your period?
Do you experience bladder pain?
Are your periods heavy?
Are you having difficulty becoming pregnant?
Does anyone in your immediate family have endometriosis?

Keeping a symptom or pain diary may make those patterns easier to recognize and discuss. NICE specifically recommends considering family history and notes that a pain and symptom diary can help during evaluation.

What happens during the physical exam?

Your doctor may perform an abdominal and pelvic exam.

During the exam, they may look for tenderness, masses, reduced movement of pelvic organs, or other findings that could provide clues.

But a normal pelvic exam doesn't mean endometriosis is impossible.

Some endometriosis lesions can't be felt during an examination.

Your symptoms still matter.

Can an ultrasound diagnose endometriosis?

Ultrasound can be an important part of the evaluation.

A transvaginal ultrasound may help identify:

Ovarian endometriomas
Some forms of deep endometriosis
Fibroids
Ovarian cysts
Other conditions that could be contributing to symptoms

Current NICE guidance recommends transvaginal ultrasound as part of the evaluation of suspected endometriosis, even when the pelvic examination is normal.

But there's an important limitation:

A normal ultrasound doesn't necessarily mean you don't have endometriosis.

Superficial endometriosis can be difficult to see on imaging, and both NICE and ESHRE specifically caution that negative imaging can't completely exclude the condition.

This is why persistent symptoms deserve attention even when a scan looks normal.

What about an MRI?

MRI may sometimes be used when your provider suspects deeper endometriosis or needs a more detailed look at certain pelvic structures.

It can be particularly helpful in evaluating the extent of deep disease in selected patients.

However, MRI isn't required for every person being evaluated for endometriosis.

Like ultrasound, a normal MRI doesn't necessarily rule out every form of the disease.

Your doctor may recommend imaging based on your symptoms and what they're trying to understand.

Do you need surgery to diagnose endometriosis?

Not always.

This is an important change in how endometriosis diagnosis is being approached.

Historically, laparoscopy was often described as the definitive way to diagnose endometriosis.

Current ACOG guidance supports using symptoms, physical findings, and imaging to make a presumptive clinical diagnosis in appropriate patients, which may allow treatment to begin without requiring immediate surgery.

However, laparoscopy can still play an important role.

It may be considered when:

Symptoms persist despite treatment
Imaging doesn't explain significant symptoms
The diagnosis remains uncertain
Surgery may also be used to treat suspected disease
Your individual circumstances make surgical evaluation appropriate

NICE guidance states that laparoscopy may be considered even when ultrasound or MRI results are normal.

The decision should be individualized.

What happens during laparoscopy?

Laparoscopy is a minimally invasive surgical procedure.

A surgeon makes small incisions in the abdomen and uses a camera to examine the pelvis.

If areas that appear to be endometriosis are found, your surgeon may document the findings and, depending on the planned procedure, collect tissue or treat the disease.

A biopsy may sometimes be taken so tissue can be evaluated by a laboratory.

Surgery isn't automatically the next step simply because endometriosis is suspected.

Your symptoms, treatment history, fertility goals, imaging findings, and preferences should all be part of that decision.

Can you still have endometriosis if your tests are normal?

Yes.

This is one of the most important things to understand about the diagnostic process.

You can have:

A normal pelvic examination
A normal ultrasound
A normal MRI

and still have symptoms that deserve further evaluation.

Current guidance specifically warns against ruling out endometriosis solely because an exam or ultrasound is normal.

That doesn't mean every unexplained pelvic symptom is endometriosis.

It means the conversation shouldn't necessarily end with one normal test.

Why can endometriosis take so long to diagnose?

Endometriosis symptoms can overlap with several other conditions.

Pelvic pain, bowel symptoms, bladder symptoms, heavy bleeding, and fertility problems can have more than one possible cause.

Some patients also spend years being told their painful periods are normal.

ACOG noted in its 2026 diagnostic guidance that delays between the onset of symptoms and diagnosis can last years, and updated recommendations are intended in part to help patients receive evaluation and care sooner.

A good evaluation should consider endometriosis while also looking for other conditions that could explain your symptoms.

When should you ask for further evaluation?

Consider talking with a provider if you experience:

Period pain that regularly disrupts your life
Persistent or worsening pelvic pain
Pain during or after sex
Painful bowel movements or urination around your period
Heavy bleeding
Difficulty becoming pregnant
Symptoms that haven't improved with treatment
Persistent symptoms despite normal imaging
A long history of unexplained pelvic symptoms

These symptoms don't automatically mean you have endometriosis.

But they're worth investigating.

Questions to ask about endometriosis diagnosis

You don't need to know which test you need before your appointment.

Consider asking:

Could my symptoms be consistent with endometriosis?
Could something else be causing my pain?
Would an ultrasound be helpful?
What can an ultrasound detect?
What does a normal ultrasound mean?
Would an MRI provide useful information?
Can we make a clinical diagnosis without surgery?
When would laparoscopy be considered?
If surgery is recommended, will suspected endometriosis be treated during the procedure?
How could diagnosis or treatment affect my fertility goals?

Understanding the reason behind each step can make the diagnostic process feel less confusing.

Getting answers may take more than one test

If you've been searching “how do I get tested for endometriosis?”, the answer is that there isn't always one single test.

Diagnosis may involve putting several pieces together.

Your symptoms matter.

Your medical history matters.

Imaging can provide useful information.

And in some situations, surgery may be part of the process.

The important thing isn't to assume that persistent pain is explained simply because one test came back normal.

At The Kaldas Center, we take the time to listen to your complete story, evaluate your symptoms and previous testing, and help you understand what the next step may be.

Schedule an appointment with The Kaldas Center to start getting answers.

Medical Disclaimer

This article is for educational purposes only and isn't a substitute for professional medical advice, diagnosis, or treatment. Pelvic pain and other symptoms associated with endometriosis can have multiple causes. Speak with a qualified healthcare provider about your individual symptoms, diagnosis, and treatment options.