There are many ways to test for Helicobacter pylori (Hp), the most commonly used is the carbon 13 and carbon 14 breath test, a method where the normal value for the carbon 14 test is usually less than 100. The normal value for the carbon 13 test is less than 4. However, the normal value varies slightly depending on the test used in different regions and needs to be judged according to the specific criteria provided by the hospital. If H. pylori exceeds the normal value, it suggests that the subject has H. pylori infection, but it does not necessarily require treatment. Treatment is only considered when bloating, abdominal pain, nausea, stomach acidity, etc. occur, and a quadruple combination of drugs is recommended for treatment. H. pylori is contagious. If someone in the family has H. pylori infection, it is recommended to eat separate meals. If the H. pylori test is below normal, H. pylori infection can be ruled out.