H. pylori tests usually include carbon breath test, blood sampling and gastroscopy biopsy, all of which need to be performed on an empty stomach. In case of carbon breath test, once eating, the food will affect the binding of C13 or C14 with urease, and it is recommended to perform the test on an empty stomach so as not to affect the test results. In the case of blood sampling or gastroscopic biopsy, it must be performed on an empty stomach. It should also be noted that there are some medications that can also affect the results, so it is best to consult your doctor in advance before testing. In the case of Carbon Breath Test (CBT) sampling and blood sampling, it is recommended to fast for at least 4 hours. In the case of gastroscopic biopsy sampling, it is recommended to fast for 6 to 8 hours. This ensures the accuracy of the results. If you need to check for Helicobacter pylori, it is recommended that the patient can go to the hospital first time after waking up, and then follow the doctor’s instructions to eat.