Carbon 13 Urea Breath Test results are available on the same day as the test. It is best to do this test on an empty stomach and to stop taking antibiotics and bismuth supplements, such as amoxicillin capsules and clarithromycin tablets, 4 weeks before the test. Stop taking acid-suppressing drugs for 2 weeks, such as omeprazole capsules, rabeprazole capsules, etc., to avoid false-negative results during the test. Do not drink, smoke or eat food during the 30-minute waiting period for this test. The carbon 13 urea breath test is positive for Helicobacter infection if the DOB value is over 4, and negative if it is between 0 and 4. If the carbon 13 urea breath test is positive, regular anti-Helicobacter pylori infection treatment is required under the guidance of a physician.