C13 is also known as carbon 13 breath test, generally 0 to 4dpm is normal. Carbon 13 breath test, the main clinical check whether the body is infected with Helicobacter pylori, the normal reference range is 0 to 4dpm, if the test result is between 0 and 4dpm, it means that the body is normal, not infected with Helicobacter pylori, if the test result is greater than 4dpm, it means that the body is infected with Helicobacter pylori. If infected with Helicobacter pylori, you should go to the gastroenterology department of the hospital in time for further examination to determine whether there is chronic gastritis, under the guidance of the doctor to use the relevant drugs to kill Helicobacter pylori, and at the same time combined with the clinical symptoms of the choice of drugs to alleviate the uncomfortable symptoms, the commonly used drugs, including amoxicillin, metronidazole, omeprazole, bismuth potassium citrate, and so on.