Does anyone have any idea of how often an IBS sufferer should get a colonoscopy and/or sigmoidoscopy performed?I have had 2 colonoscopies performed with biopsies and 2 sigmoids over the past several years. There was no evidence of IBD in any of the tests. However, I have not had any of these tests performed since January 2000 (although I have had blood work and stool samples done since then).I am sometimes concerned that my IBS might have developed into Chrons or Ulcerative Colitits, especially when I have a bad flare-up of D and mucus. BUT I really don't want to go through anymore unnessray testing for obvious reasons (not fun!) and also because it tends to aggravate my symptoms afterward. So how long can you trust the results of a colonoscopy?