[Noah930]

Not saying you should not get a colonoscopy to follow-up on your IBS; that's a good idea. But a colonoscopy may very easily miss a diverticular abscess. This is where the clinical acumen of your physicians (the people actually seeing you and putting their hands on you--not some keyboard jockey from halfway across the country) comes into play. If they suspect a diverticular abscess, then a CT scan would be more appropriate to make this diagnosis. Like fixing a car, it's about having the right tool for the job. So it comes down to what the job is--what you're trying to accomplish. What's the differential diagnosis? What are the possibilities causing the problem? And then what are the tests that can be done to corroborate or exclude those diagnoses?