Retrocop - as I have said to you before, and as anyone who has worked in a gastroenterology unit will tell you, bowel screening is not perfect in that it
only picks up two-thirds of cases of colorectal cancer, and fails to detect one third.
This is because it detects small amounts of blood loss, and not all cancers bleed all the time.
I would not like you to discourage others from taking this test, as in many hospitals at the moment there are patients who have been diagnosed at a far earlier stage thanks to this screening.
When flexible sigmoidoscopy for everyone over 50 is rolled out generally the pick up rate should improve..
http://www.cancerscreening.nhs.uk/bowel/bowel-scope-screening.html