Diagnosis

Doctors use many tests to diagnose cancer and determine if it has metastasized (spread). Some tests may also determine which treatments may be the most effective. For most types of cancer, a biopsy is the only way to make a definitive diagnosis of cancer. If a biopsy is not possible, the doctor may suggest other tests that will help make a diagnosis. Imaging tests may be used to find out whether the cancer has metastasized. Your doctor may consider these factors when choosing a diagnostic test:

• Age and medical condition
• The type of cancer suspected
• Severity of symptoms
• Previous test results

In addition to a physical examination, the following tests may be used to diagnose cervical cancer:

Pap test. The doctor gently scrapes the outside of the cervix and vagina and takes samples of the cells for testing. For more information, read Pap Test – What to Expect.

Pelvic examination. In this examination, the doctor feels a woman’s uterus, vagina, ovaries, fallopian tubes, cervix, bladder, and rectum to check for any unusual changes. A Pap test is often done at the same time.

If the doctor finds abnormal changes to the cervix during a pelvic examination and a Pap test, the doctor may test for HPV. An HPV test is similar to a Pap test, where the test is done on a sample of cells from the patient’s cervix. Certain strains (kinds) of HPV, such as HPV 16, are seen more often in women with cervical cancer and may help confirm a diagnosis. Many women carry HPV, so HPV testing alone is not an accurate test for cervical cancer. But if the Pap tests show some cellular abnormality, and the HPV test is also positive, the doctor may suggest one or more of the following diagnostic tests:

Colposcopy. The doctor may do a colposcopy to check the cervix for abnormal areas. A special instrument called a colposcope (an instrument that magnifies the cells of the cervix and vagina, similar to a microscope) is used. The colposcope gives the doctor a lighted, magnified view of the tissues of the vagina and the cervix. The colposcope is not inserted into the woman’s body and the examination is not painful, can be done in the doctor's office, and has no side effects. It can be done on pregnant women.

Biopsy. A biopsy is the removal of a small amount of tissue for examination under a microscope. Other tests can suggest that cancer is present, but only a biopsy can make a definite diagnosis. The sample removed from the biopsy is analyzed by a pathologist (a doctor who specializes in interpreting laboratory tests and diagnosing disease). If the lesion is small, the doctor may remove all of it during the biopsy. There are several types of biopsies:

• One common method uses an instrument to pinch off small pieces of cervical tissue.
  
  
• Sometimes, the doctor wants to check an area inside the opening of the cervix that cannot be seen during a colposcopy. To do this, the doctor uses a procedure called endocervical curettage (ECC). Using a small, spoon-shaped instrument called a curette, the doctor scrapes a small amount of tissue from inside the cervical opening.
  
  
• A loop electrosurgical excision procedure (LEEP) uses an electrical current passed through a thin wire hook. The hook removes tissue for examination in the laboratory. A LEEP may also be used to remove a precancer or an early stage cancer.
  
  
• Conization (a cone biopsy) removes a cone-shaped piece of tissue from the cervix. Conization may be done as treatment to remove a precancer or an early stage cancer.

The first three procedures are usually done in the doctor's office using a local anesthetic to numb the area. There may be some bleeding and other discharge and, for some women, discomfort similar to menstrual cramps. Conization is done under a general or local anesthetic and may be done in the doctor's office or the hospital.

If the biopsy indicates that cervical cancer is present, the doctor will refer the woman to a gynecologic oncologist, who specializes in treating this type of cancer. The specialist may suggest additional tests to see if the cancer has spread beyond the cervix.

Pelvic examination. The specialist may re-examine the pelvic area while the patient is under anesthetic to see if the cancer has spread to organs near the cervix, including the uterus, vagina, bladder, and rectum.

Cystoscopy. This procedure allows the doctor to view the inside of the bladder and urethra (canal that carries urine from the bladder) with a cystoscope (a thin, flexible tube with a camera). A cystoscopy is used to determine whether cancer has spread to the bladder.

Proctoscopy (also called a sigmoidoscopy). This procedure allows the doctor to view the colon and rectum using a sigmoidoscope (a thin, flexible tube with a camera). A proctoscopy is used to see if the cancer has spread to the rectum.

Laparoscopy. This procedure allows the doctor to see the abdominal area with a laparoscope (a thin, lighted, flexible tube with a camera).

X-ray. An x-ray is a picture of the inside of the body. For instance, a chest x-ray can help doctors determine if the cancer has spread to the lungs. An intravenous urography is a type of x-ray that is used to view the kidneys and bladder.

Computed tomography (CT or CAT) scan. A CT scan creates a three-dimensional picture of the inside of the body with an x-ray machine. A computer then combines these images into a detailed, cross-sectional view that shows any abnormalities or tumors. Sometimes, a contrast medium (a special dye) is injected into a patient’s vein to provide better detail.

Magnetic resonance imaging (MRI). An MRI uses magnetic fields, not x-rays, to produce detailed images of the body. A contrast medium may be injected into a patient’s vein to create a clearer picture.

Positron emission tomography (PET) scan. A PET scan is a way to create pictures of organs and tissues inside the body. A small amount of a radioactive substance is injected into a patient’s body and absorbed by the organs or tissues being studied. This substance gives off energy that is detected by a scanner, which produces the images.

To learn more about what to expect during common diagnostic tests, read Cancer.Net: Tests and Procedures.

To learn about the terms used in this section, read the Cancer.Net Feature: Cancer Terms to Know: Newly Diagnosed.