How ovarian cancer is found

Ovarian cancer is usually found through a combination of a physical exam, imaging tests, and blood work. There is no single test that diagnoses it. A doctor will typically start by asking about your symptoms and medical history, then perform a pelvic exam to feel for lumps or abnormalities. If something seems off, they order imaging — most often an ultrasound or CT scan — to get a picture of the ovaries. If imaging shows something suspicious, a blood test for a protein called CA-125 may follow. The only way to confirm ovarian cancer is a biopsy, where a sample of tissue is removed and examined under a microscope.

The challenge with ovarian cancer is that early stages often cause no symptoms, or symptoms so vague (bloating, fatigue, mild abdominal discomfort) that they get mistaken for other conditions. This is why many cases are found at later stages. If you have persistent symptoms that don't go away after a few weeks — especially pelvic pain, abnormal bleeding, or feeling full quickly when eating — mention them to your doctor rather than waiting.

Key Takeaways

  • Ovarian cancer diagnosis requires multiple tests: a pelvic exam, imaging (ultrasound or CT scan), blood work, and usually a biopsy to confirm.
  • A CA-125 blood test measures a protein that is often elevated in ovarian cancer, but it is not used alone to diagnose the disease.
  • Imaging tests show whether a growth is present, but only a biopsy — removing and examining tissue — can confirm it is cancer.
  • Symptoms like persistent bloating, pelvic pain, or feeling full quickly warrant a doctor visit, since early ovarian cancer often causes no obvious signs.

The pelvic exam and what doctors are looking for

A pelvic exam is usually the first step. Your doctor inserts two gloved fingers into the vagina while pressing on the abdomen with the other hand to feel the ovaries and surrounding tissue. They are checking for lumps, swelling, tenderness, or anything that feels abnormal. A normal ovary is about the size of an almond and should move slightly when touched. If an ovary feels enlarged, hard, or fixed in place, that raises concern.

The pelvic exam alone cannot diagnose cancer — many benign conditions cause ovarian enlargement — but it tells your doctor whether imaging is needed. If the exam is normal and you have no symptoms, no further testing may be necessary. If something feels wrong, your doctor will order an ultrasound or CT scan to see what is there.

Ultrasound and CT scans: seeing inside

Ultrasound is usually the first imaging test because it is fast, inexpensive, and uses no radiation. A technician moves a small probe over your lower abdomen (or inserts a probe into the vagina for a clearer view) to create images of the ovaries. The ultrasound shows the size, shape, and texture of any growth. Solid masses, irregular borders, and fluid-filled pockets inside a mass are warning signs.

If ultrasound is unclear or shows something concerning, your doctor orders a CT scan (computed tomography). A CT machine takes many X-ray images from different angles and combines them into detailed cross-sections of your abdomen and pelvis. CT scans are better at showing whether a tumor has spread to nearby organs or lymph nodes. They take longer than ultrasound and involve radiation exposure, so they are used when ultrasound findings need clarification or when staging — determining how far the cancer has spread — is necessary.

MRI (magnetic resonance imaging) is sometimes used instead of or alongside CT, especially if your doctor wants to avoid radiation or needs very detailed images of soft tissue. MRI uses magnetic fields rather than radiation and can take 30 to 60 minutes.

CA-125 blood test and what the numbers mean

CA-125 is a protein that circulates in the blood. Cancer cells often produce more of it than healthy cells do. A blood test measures the level, reported in units per milliliter (U/mL). A normal level is usually below 35 U/mL, though this varies slightly between labs. Elevated CA-125 can suggest ovarian cancer, but it is not specific to cancer — pregnancy, endometriosis, fibroids, menstruation, and other benign conditions also raise it.

CA-125 is never used alone to diagnose ovarian cancer. Instead, it is one piece of information alongside imaging and biopsy results. If imaging shows a suspicious mass and CA-125 is elevated, the suspicion for cancer is stronger. If imaging is normal and CA-125 is high, your doctor may repeat the test or order more imaging to investigate. After diagnosis, CA-125 levels are tracked during and after treatment to monitor whether the cancer is responding.

Biopsy: the only way to confirm cancer

A biopsy is the only test that can definitively confirm ovarian cancer. A sample of tissue is removed and sent to a pathologist, who examines it under a microscope to look for cancer cells. There are several ways to obtain a biopsy sample.

Needle biopsy uses a thin needle guided by ultrasound or CT to reach the mass and withdraw a small sample. It is done in an outpatient setting with local anesthesia and takes 15 to 30 minutes. Results come back in a few days to a week.

Surgical biopsy involves a small operation, usually laparoscopy, where a surgeon inserts a thin camera through a small cut near the navel to see inside the abdomen, then removes a sample of tissue or the entire mass. This is done under general anesthesia in an operating room. It takes longer and requires recovery time, but it allows the surgeon to see the ovaries directly and remove more tissue if needed.

In some cases, if imaging strongly suggests cancer and CA-125 is very high, a surgeon may proceed directly to a full operation to remove the ovary and surrounding tissue rather than doing a separate biopsy first. The removed tissue is then examined to confirm the diagnosis and determine the stage and type of cancer.

What happens after diagnosis is confirmed

Once a biopsy confirms ovarian cancer, your doctor orders additional tests to determine the stage — how far it has spread. This usually includes a CT scan of the chest, abdomen, and pelvis, and sometimes a PET scan (positron emission tomography), which uses a radioactive tracer to highlight areas where cancer cells are active. Blood work checks kidney and liver function to make sure you can tolerate treatment.

You will also meet with a gynecologic oncologist, a surgeon who specializes in cancers of the female reproductive system. They review all your test results, discuss treatment options (usually surgery, chemotherapy, or both), and answer questions about what to expect. The stage of the cancer, your age, overall health, and other factors determine which treatments are recommended.

Symptoms that warrant a doctor visit

Many people with early ovarian cancer have no symptoms, which is why it is often found late. However, some warning signs should prompt a visit to your doctor, especially if they persist for more than two weeks. These include persistent bloating or abdominal swelling, pelvic or lower abdominal pain, difficulty eating or feeling full quickly, urinary urgency or frequency, and abnormal vaginal bleeding or discharge.

These symptoms can have many causes — most of them not cancer — but they should not be ignored. Keep track of when they occur, how long they last, and what makes them better or worse. Write this down and bring it to your appointment. Your doctor can then decide whether imaging or other testing is needed. Catching any cancer earlier generally means more treatment options and better outcomes.

Frequently Asked Questions

Can ovarian cancer be found with a regular pap smear?

No. A pap smear screens for cervical cancer, not ovarian cancer. It samples cells from the cervix, not the ovaries. There is no routine screening test for ovarian cancer in people without symptoms or family history. If you have symptoms or risk factors, talk to your doctor about whether imaging or blood work is appropriate.

What does it mean if CA-125 is high but imaging is normal?

It does not automatically mean cancer. Many benign conditions raise CA-125, including endometriosis, fibroids, menstruation, and liver disease. Your doctor may repeat the blood test in a few weeks, order additional imaging, or monitor you over time. If CA-125 continues to rise or imaging eventually shows something, further testing may follow.

How long does it take to get a diagnosis after symptoms start?

It varies. If you see your doctor promptly and imaging shows something suspicious, a biopsy can be scheduled within days to weeks. If symptoms are vague or imaging is unclear, it may take longer as your doctor orders follow-up tests. Once a biopsy is done, results usually come back within a week. The entire process from first symptom to confirmed diagnosis can take weeks to months.

Is a needle biopsy as accurate as surgical biopsy?

Needle biopsy is accurate when it successfully samples cancer cells, but it takes a smaller sample than surgical biopsy. Sometimes a needle biopsy is inconclusive, and a surgical biopsy is needed. Your doctor will discuss which approach is best based on the size and location of the mass and how suspicious it looks on imaging.

What if I have a family history of ovarian cancer?

Tell your doctor. A family history of ovarian cancer, especially in a mother or sister, increases your risk. Your doctor may recommend genetic testing for BRCA mutations, which significantly raise ovarian cancer risk. If you carry a mutation, your doctor may suggest more frequent screening with ultrasound and blood work, or preventive surgery in some cases. Genetic counseling can help you understand your risk and options.