Re: False negative-hpylori
From what I have read, if you are taking any PPI's or pepto when you have the test done (be it stool or breath test) you can pull a false negative . I have read that a stool test is better then breath. Blood tests will be positive for a long time once you have the bacteria so they are useless except for first time detection. And of course, a stomach biopsy is the most exacting dx you can get.