At Harrisburg Gastroenterology, we specialize in Internal Medicine and Gastroenterology in Harrisburg & Central PA. We currently perform our outpatient procedures at the Harrisburg Endoscopy & Surgery Center. In this state-of-the-art surgical center, our patients are able to have their upper and lower endoscopies in a comfortable and relaxed atmosphere. Our doctors are also on staff at Pinnacle Health Hospitals and Holy Spirit Hospital. Colonoscopy: A colonoscopy enables your doctor to examine the lining of your colon (large intestine) for abnormalities. EGD (esophagogastroduodenoscopy) or upper endoscopy. ERCP (endoscopic retrograde cholangiopancreatogram): This procedure is used to view the common bile duct. ERCP is used to help locate and treat blockages in the duct. Upper GI Series, Abdominal Ultrasound, Abdominal CT Scan. Liver biopsy: A liver biopsy is scheduled to exam liver tissue to diagnosis conditions of the liver including cirrhosis, hepatitis, or tumors.