The person seals the folder and mails it to a medical lab. Lab technicians process the panels and observe the reaction. Reasons for digestive tract bleeding include hemorrhoids, leaking blood vessels, ulcers, ulcerative colitis, dysentery, or simply an unusual diet. A positive test result may also indicate polyps in the colon or rectum. Polyps are not cancer, but they can become cancer.
Further tests are necessary to define the cause.
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