The following tests can be done to confirm the diagnosis of acute gastroenteritis: 1. physical examination, when acute gastroenteritis attacks, the pain around the navel or upper abdomen will feel intense, the pain will last for some time, and sometimes there is a feeling of fullness. 2. gastroscopy, doing gastroscopy can clearly observe the stomach lesions, but also see whether the gastric mucosa is congested, edema, etc., can also observe the erosion of the gastric mucosa condition. 3. The first thing you need to do is to do a test for H. pylori, which is a common method for diagnosing acute gastroenteritis. If the disease is recurrent, stool culture and routine stool examination are needed to detect whether there are bacteria and viruses in the body, and then treat the symptoms, etc.