Hi I've had 2 Colonoscopies and as you say 12 is a very low number considering some people can have a test in the high hundreds ,as we know the cut off point is 10 before they investigate ,in my opinion you would be justified in waiting and asking for another fit test at a later date ,I've seen people on here have more than one test before having a Colonoscopy especially if they have no other symptoms ,I would run it by your GP ,I'm sure it won't be a problem ....