interesting the docs say that it is giving false positives. I am an engineer. This test must use some sort of gas sensor to test for levels of hydrogen and methane. My test came back with a nice smooth curve showing the rise in gases over the 3 hrs of my test. It was a continuous rise without big jumps. This indicates to ME, at least, that the sample vial I generated from each breath draw(every 20 min) gave consistent results. They calibrate their test system with pure gases before they measure. This technology is old and proven and I BELIEVE the test results.
My take: the docs who shoot this down either: 1) don't want to accept the concept of SIBO, 2) don't have access or want to bother with the test, or 3) are simply ignorant of its efficacy.