Gastroscopy is required after total gastrectomy, and colonoscopy is not used to check for diseases of the upper gastrointestinal system.
Gastroscopy, also known as upper gastrointestinal endoscopy, enters the upper gastrointestinal tract through the mouth and is not only used to check for stomach-related diseases, but also esophagus and duodenum-related diseases. Therefore, after total gastrectomy, when you wish to check for esophageal and duodenal diseases, you still need to go through gastroscopy.
After total gastrectomy, the esophagus and duodenum are often anastomosed. By performing a gastroscopy, it is possible to see how well the anastomosis is healing and whether there is bleeding, inflammation, tumor recurrence and metastasis in and around the anastomosis.
Colonoscopy generally refers to colonoscopy, which enters the lower gastrointestinal tract through the anus, and can see diseases of the rectum and colonic intestinal tract; diseases related to the esophagus, stomach, and duodenum cannot be seen through colonoscopy.