The normal range for the carbon 13 breath test is less than 4 dpm. if the test result is greater than 4 dpm, it indicates a possible H. pylori infection, and it is recommended that it be treated with quadruple therapy under a doctor’s supervision. Quadruple therapy consists of two antibiotics, a proton pump inhibitor, and a bismuth agent. 1. Two kinds of antibiotics: the function of antibiotics is to kill H. pylori bacteria, usually you can use clarithromycin, metronidazole, amoxicillin and so on. 2. Proton pump inhibitor: it is the most widely used acid inhibitor in the clinic, which can effectively inhibit gastric acid secretion. Commonly used proton pump inhibitors are omeprazole, lansoprazole, rabeprazole and so on. 3. Bismuth: It belongs to a kind of gastric mucous membrane protection agent, and also has an inhibitory effect on Helicobacter pylori. Commonly used bismuth agents include bismuth potassium citrate and bismuth pectin. The course of quadruple therapy is 10 to 14 days, and one month after stopping the medicine, you need to go to the hospital to review the H. pylori bacteria. If H. pylori infection is diagnosed, it is recommended that treatment be carried out under the guidance of a doctor.