Screening Tests for Bowel Cancer

Screening tests for bowel cancer are used to look for signs of cancer or polyps before symptoms appear. Screening can help find colorectal cancer earlier, when treatment may work better.

This article is for general information only. Screening recommendations depend on age, personal risk, family history and local guidelines. Ask your doctor which screening test is right for you.

Why Screening Tests Matter

Screening can find colorectal cancer before symptoms begin. Some tests can also find polyps that may be removed before they become cancer.

NCI explains that colorectal cancer screening can find cancer before symptoms begin and that some screening methods allow polyps to be found and removed before cancer develops. :contentReference[oaicite:6]{index=6}

Stool-Based Tests

Stool-based tests look for hidden blood or other signs in stool. They are usually done at home and sent to a laboratory or healthcare provider.

Common stool-based tests include FIT and guaiac-based faecal occult blood tests.

Visual Tests

Visual tests allow doctors to look inside the bowel or create images of it. These may include colonoscopy, flexible sigmoidoscopy or CT colonography depending on the situation.

Colonoscopy can also allow doctors to remove some polyps or take biopsies during the same procedure.

Abnormal Screening Results

An abnormal screening result does not automatically mean cancer, but it does need follow-up. CDC notes that positive or abnormal stool tests, flexible sigmoidoscopy or CT colonography should be followed by colonoscopy to complete the screening process. :contentReference[oaicite:7]{index=7}

Screening Is Not the Same as Diagnosis

Screening is for people without symptoms. If you have symptoms such as blood in the stool, persistent bowel changes, unexplained weight loss or abdominal pain, contact a doctor instead of waiting for routine screening.

For symptom testing, read our Tests to Find Cancer in the Bowel article.

Final Thoughts

Screening tests for bowel cancer can be an important part of early detection and prevention. Ask your doctor when to start screening, which test is suitable and how often it should be repeated.