Clinical Research Directory

Inclusion Criteria: 1. Crohn's disease or ulcerative colitis patients scheduled or about to be scheduled for colonoscopy. 2. Age \> 18 years 3. Out-patients Exclusion Criteria: 1. Prior subtotal or total colorectal resection 2. Contraindications to use of 2L polyethylene glycol (2L-PEG) or Oral Sulfate Solution (OSS): Known renal insufficiency, congestive heart failure, cirrhosis, severe electrolyte imbalance. 3. Colonoscopy being repeated because of poor preparation in the preceding six months. 4. Allergies to the employed bowel preparations 5. Toxic megacolon, ileus, suspected or diagnosed bowel obstruction. 6. IBD patients thought to be too sick to undergo a full colonoscopy preparation in the opinion of the investigator/treating physician; hospitalized crohn's disease or ulcerative colitis patients. 7. Pregnancy