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