The carbon 14 breath test is usually harmless and is a non-invasive test for H. pylori. Before the carbon 14 breath test, the patient needs to take a capsule containing carbon 14 labeled urea. If the patient is infected with H. pylori, the urease enzyme in the stomach will break down the carbon 14 labeled urea to produce ammonia and carbon 14 labeled carbon dioxide, and then the carbon dioxide exhaled will be collected and measured by the appropriate instrument to get the final result. Carbon 14 radiation is extremely low in energy, and the unbroken down urea is excreted in the urine, and the ingested carbon 14 is not converted to part of the body. Generally speaking, Carbon 14 can be eliminated from the body after 48 hours and will not cause any harm to the human body. Professional reports confirm that Carbon 14 is clinically safe to use with negligible harm to patients and operators. If a patient wishes to perform a Carbon 14 breath test, it is recommended that he or she seek medical attention and be properly instructed by a physician.