The Carbon 13 H. pylori test checks for Helicobacter pylori bacteria, a method of clarifying the presence of H. pylori infection in the stomach. The standard name for the Carbon 13 H. pylori test is the Carbon 13 Breath Test, which utilizes the principle that H. pylori can break down urea to produce carbon dioxide. To avoid affecting the test results, the carbon 13 breath test requires fasting for 2 to 3 hours before the test. The test is usually performed by asking the patient to exhale once and collect the gas before the test, then asking the patient to swallow a urea capsule containing carbon 13 labeling, sit still for 30 minutes, and then blow again and collect the gas. The carbon 13-labeled carbon dioxide is detected in the collected gas to clarify whether the patient has H. pylori infection. The normal value of the carbon 13 breath test is 0 to 4 dpm, and if the test result exceeds 4 bpm, it is positive, indicating the presence of H. pylori infection. Since H. pylori infection is closely related to the development of chronic gastritis, peptic ulcer, gastric cancer and other diseases, once a positive result is determined, eradication treatment for H. pylori is needed in a timely manner. Carbon 13 breath test should be reasonably carried out under the guidance of a doctor. Positive patients are advised to consult a doctor in time and receive treatment actively so as not to delay the condition.