Currently the most common test for H. pylori is the C13-H. pylori breath test. The main application of the isotope labeling method is by far the most recognized test. The cost of this breath test is not too high, between sixty and two hundred dollars. The cost varies depending on the level of the hospital and the region. Helicobacter pylori lives mainly in various areas of the duodenum and is an anaerobic bacterium. Generally, in addition to the breath test, it can be supplemented with blood tests, stool tests and other methods. This test should be avoided for pregnant and breastfeeding women. This is the most popular test because it does not require a gastroscopy, is painless, safe and accurate, has no risk of infection, and is reasonably priced.