richvank, in previous posts you have mentioned the following tests: Diagnos-techs Expanded G.I. panel Metametrix G.I. Function test Genova Diagnostics NutrEval Metametrix ION profile You said that the latter two give some information about the condition of the digestive system. Do they give enough to make them a reasonable substitute for the first two? Which one or two of these tests (or any others you know) would give good information/dollars spent for someone wanting to start addressing digestive system issues? I realize that my final choice may be limited by what is available through my physician or directly to clients.