title: The yield of colonoscopy in average-risk patients with non-specific colonic symptoms.
abstract: OBJECTIVE
  The need for full colonoscopies in average-risk patients with non-specific colonic symptoms is controversial. We aimed to evaluate: (1) the yield of full colonoscopy; (2) the prevalence of proximal neoplasia in these patients; (3) the yield if any of doing full colonoscopies to diagnose proximal lesions in patients in whom the distal colon was clear; (4) the significance of this yield with respect to age.
  
  
  METHODS
  This is a retrospective analysis to assess the value of open access colonoscopy.
  
  
  METHODS
  All patients who underwent a colonoscopy in our Endoscopy Unit during January 1996 to December 1999 were assessed (n = 3357).
  
  
  RESULTS
  We analysed 945 patients with average risk and non-specific colonic symptoms (significant risk factors excluded). The overall yield of adenomas was 5.8%. The yield of distal adenomas in patients > or= 50 years of age was 8.2% (37 out of 450) versus 0.2% in the 50 years group (one out of 495; = 0.0001). The proximal adenoma yield in > or= 50 year olds was 3.8% (17 out of 495) versus 0.2% in < 50 year olds (one out of 495) (P = 0.0001).
  
  
  CONCLUSIONS
  In a cohort of average-risk patients with non-specific colonic symptoms attending an "open access" colonoscopy clinic, the yield for proximal adenomas is small in the < 50 years group. In patients aged < 50 years, distal colonic examination is all that is required, whereas a full colonoscopy may be justified in patients > or = 50 years old.
mesh_terms: D000236:Adenoma / Q000175:diagnosis*; D000328:Adult; D000367:Age Factors; D000368:Aged; D003110:Colonic Neoplasms / Q000175:diagnosis* / Q000473:pathology; D003111:Colonic Polyps / Q000175:diagnosis / Q000473:pathology; D003113:Colonoscopy / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors