The normal value of H. pylori C13 breath test is 0~4dpm. C13 breath test is one of the common methods to detect H. pylori in clinic, and its normal value is 0~4dpm, if the C13 breath test detection value is greater than 4dpm, it means that the patient is infected by H. pylori. If H. pylori exceeds the normal value, it cannot be ruled out that the infection is caused by direct transmission or indirect contact transmission. When a patient is infected with H. pylori, it may lead to diseases such as chronic gastritis, peptic ulcer and stomach cancer. If the value of C13 breath test is greater than 4dpm, it is necessary to take the quadruple therapy treatment under the guidance of the doctor in time, such as omeprazole enteric-coated capsules, amoxicillin capsules, clarithromycin hydrochloride capsules, bismuth potassium citrate capsules, etc., which can achieve the effect of killing H. pylori bacteria through the drug treatment. When the patient examination found that the C13 breath test index is abnormal, should be timely under the guidance of the doctor for treatment.