I did a lactulose breath test from Aerodiagnostics in December 2017. Prep diet, fast, blow into tubes. You know the drill. As below, I am methane predominant.
For those of you who don’t know, the test is looking at the hydrogen and methane levels during the small intestine phase (see bottom of 2nd image). The levels are supposed to increase when the lactulose hits the colon (large intestine), which is normal and healthy. We are not meant to have hardly any bacteria in our small intestines. however.