Oral urea capsules are required before the carbon 14 breath test, and the correct result cannot be checked without the urea capsules. Carbon 14 breath test is commonly used to detect the presence of Helicobacter pylori, before the test need to take carbon 14 labeled urea capsules, Helicobacter pylori secretion of the urease enzyme can break down the urea to produce carbon dioxide, if there is an infection can be detected by the labeled carbon dioxide; the more labeled, the more serious the infection, and vice versa, there will be no labeled carbon dioxide. It is important to follow your doctor’s instructions for performing a carbon 14 breath test to avoid inaccurate results. H. pylori infection may cause gastritis, gastric ulcer, gastric cancer, etc. If H. pylori infection occurs, standardized treatment should be carried out under the guidance of a professional doctor to avoid delays.