I have been tested twice so far for Hydrogen Breath test used for elimination of Lactose Intolerance. First time, I received antibiotic and Flagyll and continued diet of no dairy and no fresh fruits and vegetables. The second testing was done this week and the counts were higher than the first time after antibiotic therapy and diet restrictions. Nurse says next course of action other than a new antibiotic was scheduling of Small Bowel series. My question to the nurse and to you as well is why the stool specimens were all negative if I have such an infection in the small bowel. What do you all make of this? I am getting very impatient to know what they will do for me for the IBS-D that I went to them for. I have been seen by the doctor only for initial visit and the rest of my communication has been through a nurse who talks to you like you are a two year old. I dare to say that I probably know more about GI disorders than she does. She indicated that the Small intestine is sterile and does not contain any bacteria. I do not believe this to be true based on the research I have read. If the digestive tract is one continuous tract, how can one part be sterile when the mouth is considered a non sterile environment and neither is the colon. Someone enlighten me and tell me where it says that the small intestine contains no bacteria normally.