A gastroscopy is a procedure where a thin, flexible tube called an endoscope is used to look inside the oesophagus (gullet), stomach and first part of the small intestine (duodenum). It is also sometimes referred to as an upper gastrointestinal endoscopy. The endoscope has a light and a camera at one end. Sometimes samples (biopsies) are taken for diagnosis and /or treatment. Photos can be taken and included in your report/diagnosis. These procedures can be undertaken with the use of sedation and or Entonox.