The normal range of H. pylori values is 0-100 dpm for the carbon 14 urea breath test and 0-4 dpm for the carbon 13 urea breath test. the normal range of values may vary from one testing center to another. The diagnosis of H. pylori infection in the stomach can be confirmed by means of a breath test, which involves determining the disease by the amount of radioactive elements in the exhaled gas. If the radioactive elements in the exhaled gas are above the normal range, the diagnosis of H. pylori infection in the stomach can be made. The normal value of this test is between 0 and 100 dpm. A test within 100 dpm is negative, indicating no infection, while a test above 100 dpm is positive and should be treated with medication according to the patient’s condition. Some patients belong to special groups, such as children and pregnant women, who need to use the carbon 13 breath test for H. pylori. The normal range for the carbon 13 breath test is between 0 and 4 dpm, and more than 4 dpm indicates that the stomach is infected with H. pylori and requires medication.