Carbon 14 generally refers to the carbon 14 breath test, and drinking 100 milliliters of water during the carbon 14 breath test may affect the results. Carbon 14 breath test is generally a method to check whether there is Helicobacter pylori infection, you need to keep an empty stomach before the carbon 14 breath test, because eating will affect the secretion of gastric acid, which may make the Helicobacter pylori false positive performance. At the same time, it is not advisable to drink a lot of water during the test. Drinking a small amount of water is acceptable, but drinking 100 ml of water at one time may affect the test results. If you drink 100 ml of water during the carbon 14 breath test, it is advisable to consult your doctor to determine if you need to repeat the test.