Better than blood: H. Pylori is a bacteria that live sin the stomach and is associated w ulcers. The breath test and stool test are very reliable in showing the current presence of disease and if treatment for the disease worked. Blood test show mostly old infections and are not as accurate as the above 2. The most accurate test is a biopsy of the stomach lining with a safe but invasive test called an endoscopy.
Answered 11/23/2014
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