Disorders of intestinal flora often require fecal tests, blood tests, endoscopy tests and hydrogen methane breath tests. 1. Stool test: including fecal occult blood test, which can observe the white blood cells, red blood cells and stomach digestion of food, so as to determine whether it is accompanied by gastrointestinal bleeding and intestinal infections, and it can also be carried out smear examination to analyze the type of flora as well as the number of flora. 2. Blood test: mainly routine blood test, often also need to do liver and kidney function test, is conducive to the differential diagnosis of intestinal flora disorders. 3. Endoscopic testing: including gastroscopy and colonoscopy, through endoscopy, the digestive tract can be visualized. 4. Hydrogen-methane breath test: It is a screening technique to diagnose the cause of gastrointestinal symptoms and certain extra-intestinal disorders by measuring the concentration of hydrogen and methane in the exhaled gas over time as well as the amount of hydrogen and methane exhaled gas over a period of time. Intestinal flora disorders should cooperate with the doctor to take the relevant tests, confirm the diagnosis and receive treatment early to promote the recovery of the condition.