The breath test is easy and it measures hydrogen and methane, I took the test registered really high for hydrogen ND said it was SIBO full blown symptoms. Now my husband took the test he registed high for both hydrogen and methane... he also has SIBO but he only has two symptoms super bad case of flatulence and he used to have bad breath and now he feels constipated a lot. SIBO has me perplexed, but I'm trying the rifaximin now, and will go to the ND college for chinese herbs, at the college they basically told me they can cures lots of things but they can't never say that it can cure you ever ... because of the FDA AMA doesn't allow it ... I think that is retarded, but I realize the strong hold.