Direct bacterial sampling from your gut or small intestine and culturing any bacteria found is a way to diagnose SIBO effectively, but this involves anesthesia and a scope. Another option for how to diagnose is the hydrogen breath test, which is not invasive and only requires a pretest fast. SIBO symptoms commonly associated with IBS (Irritable Bowel Syndrome) like excess gas, abdominal bloating or pain, and diarrhea.https://kendraperry.net/z-sibo-series-part-1/