As I have pointed out in another thread. They are not looking for blood. You do not have to have bleeding polyps or anything else. The test is a dna test on cells of the gut lining, which are normally and constantly shed. The dna test looks for certain markers specific to colon cancer. This is highly specific, and provides early detection. Without the need for prep, anesthesia, an invasive procedure, with attendant risks.
You can ALWAYS elect to follow up with a standard colonoscopy. But, for routine testing, it’s my choice.
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