What doctors look for when checking for ovarian cancer

Ovarian cancer is detected through a combination of physical examination, blood tests, and imaging—usually ultrasound or CT scans. There is no single test that definitively rules ovarian cancer in or out. Instead, doctors use multiple pieces of information together: what you report about symptoms, what they find during a pelvic exam, whether certain protein markers appear in your blood, and what imaging shows about the ovaries themselves.

The process usually starts because you have symptoms—pelvic pain, bloating, difficulty eating, or urinary changes that have lasted weeks—or because screening finds something unexpected. A gynecologist or oncologist will then order tests in sequence, interpreting each result alongside the others rather than relying on any one finding alone.

Key Takeaways

  • A pelvic ultrasound is usually the first imaging test because it shows ovary size, shape, and any fluid or solid areas without radiation.
  • A blood test for CA-125 protein can suggest ovarian cancer but is not specific to it—many benign conditions raise CA-125 levels.
  • CT scans show whether cancer may have spread beyond the ovaries and help doctors plan surgery or treatment.
  • A tissue sample (biopsy) is the only way to confirm ovarian cancer, and it usually happens during surgery rather than beforehand.

The pelvic exam and what doctors are checking

During a pelvic exam, your doctor inserts two gloved fingers into the vagina while pressing on the lower abdomen with the other hand. This allows them to feel the size, shape, and texture of the ovaries and surrounding tissue. They are looking for ovaries that are enlarged, hard, or irregular—characteristics that differ from normal ovarian tissue.

A pelvic exam alone cannot diagnose ovarian cancer, but it can prompt further testing. If an ovary feels abnormal or if you have symptoms that suggest ovarian cancer, your doctor will order imaging. The exam is often the first step that leads to other tests, not a definitive finding on its own.

Ultrasound: the standard first imaging test

Transvaginal ultrasound is usually ordered first because it gives a clear view of the ovaries without radiation. A small probe is inserted into the vagina, and sound waves create images of the ovaries, fallopian tubes, and uterus. The doctor looks for cysts, solid masses, fluid buildup, or other abnormalities in size or appearance.

Ultrasound cannot prove cancer is present, but it can show whether an ovary looks suspicious enough to warrant further investigation. Some findings—such as a solid mass with irregular borders or fluid around the ovaries—raise concern more than others. If ultrasound shows something worrisome, your doctor will typically order a CT scan and blood tests to gather more information.

CA-125 blood test and what the results mean

CA-125 is a protein that appears in higher amounts in the blood of many people with ovarian cancer. A lab measures the level in a blood sample, and results are reported as units per milliliter. However, CA-125 is not specific to ovarian cancer—it can be elevated in endometriosis, fibroids, menstruation, pregnancy, and many other benign conditions, as well as in other cancers.

Doctors use CA-125 alongside imaging and symptoms, not as a standalone test. A very high CA-125 level combined with an abnormal ultrasound and symptoms suggestive of ovarian cancer raises suspicion significantly. A normal or mildly elevated CA-125 does not rule out cancer, especially in early stages. Some people with ovarian cancer have normal CA-125 levels throughout their illness.

CT scan and staging the extent of disease

A CT (computed tomography) scan uses X-rays to create detailed cross-sectional images of the pelvis and abdomen. If ultrasound and blood tests suggest ovarian cancer, a CT scan helps determine whether cancer has spread to lymph nodes, the peritoneum (the lining of the abdominal cavity), or other organs. This information is critical for planning surgery and deciding on treatment.

CT scans are more sensitive than ultrasound for detecting spread but are less detailed for viewing the ovaries themselves. For that reason, doctors typically order both: ultrasound to examine the ovaries closely, and CT to see the bigger picture of whether disease extends beyond them. The CT scan also helps the surgeon plan the extent of surgery needed.

Biopsy: the only definitive test

A tissue sample is the only way to confirm ovarian cancer. This sample is usually obtained during surgery rather than beforehand. A surgeon removes the ovary, a portion of it, or fluid from the abdomen, and a pathologist examines the cells under a microscope to determine whether cancer is present and what type it is.

Doctors do not typically perform a needle biopsy of the ovary before surgery because the risk of spreading cancer cells outweighs the benefit of knowing the diagnosis in advance. Instead, imaging and blood tests guide the decision to operate, and the tissue diagnosis comes during or after the procedure. In some cases, a sample of fluid from the abdomen (paracentesis) may be taken to look for cancer cells, but this is less common.

What happens if imaging is unclear or borderline

Sometimes ultrasound shows a cyst or mass that could be benign or could be cancer—the imaging alone does not make it clear. In these situations, doctors may repeat ultrasound after several weeks to see whether the finding has changed, order an MRI for additional detail, or recommend surgery based on the pattern of findings and your symptoms.

Age, menopausal status, and family history of ovarian cancer all factor into the decision. A postmenopausal woman with a new solid ovarian mass and elevated CA-125 faces higher suspicion than a younger woman with a simple cyst. Your doctor will discuss the level of concern and the next steps based on your individual situation.

Frequently Asked Questions

Can a Pap smear detect ovarian cancer?

No. A Pap smear screens for cervical cancer, not ovarian cancer. It samples cells from the cervix, not the ovaries. There is currently no screening test for ovarian cancer that is recommended for women without symptoms or family history.

What does a normal ultrasound mean?

A normal ultrasound showing ovaries of typical size and appearance is reassuring but does not completely rule out early ovarian cancer. If you have symptoms consistent with ovarian cancer, your doctor may still recommend follow-up imaging or blood tests even with a normal initial ultrasound.

How long does it take to get a diagnosis?

The timeline varies. An ultrasound can be scheduled within days to weeks. Blood tests return within a few days. If imaging is suspicious, a CT scan may follow within one to two weeks. Surgery and tissue diagnosis typically occur within two to four weeks of the initial findings, though urgent cases move faster.

What if I have symptoms but all tests are normal?

Persistent symptoms warrant follow-up even with normal initial tests. Ask your doctor whether repeat imaging in several weeks makes sense, or whether a referral to a gynecologic oncologist would be helpful. Some early cancers do not show up on first imaging.

Does elevated CA-125 mean I have ovarian cancer?

No. Many conditions raise CA-125, including menstruation, endometriosis, fibroids, and infections. Elevated CA-125 combined with abnormal imaging and symptoms raises concern, but CA-125 alone does not diagnose cancer. Only a tissue sample can confirm the diagnosis.