The normal range of H. pylori C14 indicator is 0~100dpm per unit of carbon dioxide content (DPM).Due to the different testing instruments in different hospitals, the normal value range may vary, the specific hospital report card shall prevail. Helicobacter pylori can cause gastritis, peptic ulcer and other diseases, and is classified by the World Health Organization as the first group of carcinogenic factors. The normal range of H. pylori C14 index is 0~100dpm per unit of carbon dioxide content (DPM). The use of H. pylori inhibitors in the month prior to the C14 test, a history of upper gastrointestinal bleeding in the last week, and failure to fast prior to the test can all contribute to the error in the test results, resulting in a false-negative result. For more accurate results, it is important to fast for more than 6 hours before the test, and if you are taking anti-Helicobacter pylori medications, you need to stop taking antibiotics and bismuth for 30 days and proton pump inhibitors for 2 weeks before taking the test. Regular C14 testing is recommended for people at high risk of stomach upset and chronic poor diet. If the C14 test is positive, it is recommended that treatment be carried out under the guidance of a physician, and do not take medication on your own to avoid adverse consequences.