Diagnosis of angiodysplasia is often accomplished with endoscopy, either colonoscopy or esophagogastroduodenoscopy (EGD). Respiratory, gastrointestinal, and esophageal candidiasis require an endoscopy to diagnose. Diagnosis is usually by biopsy done during endoscopy. Esophageal webs can be ruptured during upper endoscopy. The diagnosis may be confirmed with endoscopy or medical imaging. This is frequently needed during fluoroscopy or endoscopy. During an endoscopy, a biopsy may be taken. Current recommendations include routine endoscopy and biopsy (looking for dysplastic changes). Laparoscopic and thoracoscopic surgery belong to the broader field of endoscopy. Visual analysis is also available using specialized medical equipment such as ultrasound and endoscopy. This paved the way for biopsy samples taken by endoscopy. Clinical investigations include X-rays when swallowing barium, endoscopy, and CT scans. Nasal endoscopy and clinical symptoms are also used to make a positive diagnosis. A 2007 study on two women involved ultrasound, endoscopy, and biochemical analysis of fluid. Patients who have had an endoscopy without sedation are able to leave unassisted.