The correct blowing method for checking H. pylori is to blow slowly, usually for 3 to 5 minutes. Stop blowing when the indicator light turns yellow. 1. Blowing method: After opening the gas collection device, blow inside the place of the blowing nozzle, blowing slowly, if the lung capacity is not enough, you can stop blowing, and then continue to blow after a temporary rest, but pay attention not to inhale the gas in the gas collection bag, and blowing time is about 3~5 minutes, and then stop blowing after the indicator light turns yellow. 2. Precautions: Before the H. pylori carbon 13, carbon 14 test, it should be noted that the first three weeks or so to avoid taking antibiotics, acid-suppressing drugs, gastric mucosa protection drugs, the day of the test to the hospital on an empty stomach to check, or 2 hours after the meal to the hospital to check, in the test before the test will be recommended to take the test urea carbon 13, carbon 14 capsule, 15 minutes after taking it to be able to carry out the blowing test. Specific H. pylori testing methods should follow the doctor’s advice and seek prompt medical attention.