you can repeat the stool/breath test a month later to double confirm.
H. pylori has very strong urease enzyme. So that dpm is reflecting on how much urease activity there is. Since H. pylori has such strong urease acitivity, you'll get a reading of dpm in hundreds or even thousands.In my case I did tested negative 13 dpm last month. Does it mean that there are 13 hpylori in my system and they can spread again? It may look like a silly question but I just wanted to understand the true sense of being negative.
However, the urease activity is relying on acidic condition. If your stomach is not acidic enough, sometimes, you can get very low reading like 30-50.
so make sure you are not taking any PPI during the test.
Lastly, H. pylori is not the only organism that has urease enzyme. Ecoli has it too. That's why E coli causes UTI. But the urease activity from other bacteria is very weak compare to H. pylori. So your low reading is probably due to these other background bacteria.
So in conclusion, you can use this dpm reading to tell you how accurate is your test. the lower the dpm, the more likely that it is true negative.
if the cut off is 50 and you got 13, I think that's pretty low and you are likely to be free of H. pylori.
if the cut off is 15 and you got 13, then I think you probably need a repeat a month later.