“there is convincing evidence that stool tests with appropriate follow-up can significantly reduce deaths from colorectal cancer,” the canadian cancer society said in an emailed statement to healthing. “…a colonoscopy is not usually recommended as a routine screening test for people who don’t have a high risk for colorectal cancer. there isn’t enough evidence that it is more helpful than other available tests, and it has a slightly greater risk for harm.”
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american cancer society, on the other hand, recommends adults not considered high risk start using either a stool test or scope screening at the age of 45. screening methods include a full colonoscopy every 10 years, a flexible sigmoidoscopy every five years or a yearly stool test.
patients who are considered high risk include those who “have a parent, sibling or child with colorectal cancer, a personal history of colorectal cancer or non-cancerous polyps in the colon or rectum, inflammatory bowel disease and some inherited conditions such as familial adenomatous polyposis or lynch syndrome,” according to the canadian cancer society. in these instances, the patient’s doctor may choose to start screening early and use scopes instead of stool tests.
screening for colorectal cancer
there are two kinds of stool tests. the first, a guaiac fecal occult blood test (gfobt) tests for trace amounts of blood in the sample, which could be a warning sign of developed tumours, according to
colorectal cancer canada. the second stool test, fecal immunochemical test (fit or ifobt), also tests for blood, but uses an antibody detection method to screen for the presence of hemoglobin proteins, which may be more accurate.
if a stool sample is flagged, or if your doctor determines it’s necessary based on your risk factors, a flexible sigmoidoscopy or colonoscopy might be considered necessary. both procedures involve inserting a thin, flexible camera
into the rectum and colon in order to visually look for signs of cancer like bleeding or polyps. in some cases, a small tissue sample may also be taken for analysis, polyps may be removed, and bleeding can be addressed.