The clinical term carbon 14, or carbon 14 breath test, is a commonly used method to detect H. pylori infection. Carbon 14 breath test has become the first choice for detecting H. pylori with the advantages of being painless, non-invasive, easy to operate, inexpensive, and free of cross-infection, and has been widely used in clinical practice. The carbon 14 breath test involves the oral administration of urea labeled with the carbon 14 isotope. If H. pylori is present in the stomach of the tested person, the urease enzyme in the stomach can break down the urea into ammonia and carbon dioxide labeled with carbon 14, and the carbon dioxide labeled with carbon 14 is exhaled through the lungs, and the exhaled gas can be analyzed to determine whether or not the tested person is infected with H. pylori. Carbon 14 breath test has related requirements and contraindications, if you need to check, it is recommended to go to a regular hospital and follow the guidance and advice of professional doctors.