The Gastroenterology Institute of Southern California Explains the Colonoscopy and Why It Is Important : Your digestive health is critical to your overall well-being. Have you undergone your scheduled colonoscopy, to ensure your digestive and general health? Turn to Dr. Petyon P. Berookim, and his Gastroenterology Institute, for your next colonoscopy or other digestive health procedure. His Institute offers all the state-of-the-art procedures to examine your digestive system both comprehensively and comfortably.