Is stool test effective in checking for h pylori again after it has been eradicated once? mine was eradicated few years ago but stool test is positive for it again.

Yes, but...: One has to follow the doctor's or the lab's instructions. The stool test looks for parts of the bacteria, which means a diluted sample such as a watery stool might get a negative test result even with some H. pylori bacteria present. That's why the lab doesn't want watery stool. After stomach symptoms are gone, and after waiting an amount of time instructed by one's doctor, the stool test is done.

Yes, can get again: H. Pylori is a common infection. Like getting the flu or a urinary tract infection, people often get it again. It can be hard to distinguish between a past and current infection with a blood test but a stool test reliably shows you're currently infected. Standard treatment with antibiotics will disrupt your beneficial flora so I advise Mastic Gum and other herbs proven as effective as antibiotics.