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The problem with other types of tests, such as the virtual colonoscopy, is that the preparation is the same for these procedures as for colonoscopy, and if polyps are found, then colonoscopy still needs to be done for removal. In addition, the detection rate remains less than optimal with these tests. Blood tests can certainly detect anemia, or a low blood count, which is an indication for colonoscopy. However, no specific blood test has been shown to be sensitive enough to detect colon polyps or cancer.