Helicobacter pylori is now commonly checked by carbon 13 and carbon 14 breath test. The one-time cost is around 100~300 RMB, and the specific charges are subject to the local hospital. Carbon 13 and carbon 14 breath test is a non-invasive, highly accurate, specific, convenient and quick test to check whether the organism is infected with H. pylori by blowing air and utilizing orally administered nuclide carbon 13 or carbon 14 labeled urea. It should be noted that the results of carbon 13 and carbon 14 breath test are easily affected by diet and medications such as omeprazole, so the test should be performed on an empty stomach for 2 hours or more before the test, and acid suppressants such as pantoprazole and ranitidine should be discontinued for 2 weeks, and antibiotics such as clarithromycin and furacilin should be discontinued for 4 weeks. For pregnant women of advanced age, it is necessary to pay attention to normal breathing before the examination, do not hold your breath, inhale, blowing should keep the respiratory rhythm stable, do not blow quickly, so as not to lead to the lack of oxygen in the body.