I have been diagnosed with MG for over 10 years, several times having major problems and some times having to be intubated. Recently my Neuro sent me to the Mayo for more test and they say they don't even think I have MG. The one test came back saying, single fiber EMG,parameters are borderline and mild. Does anyone know what this means. I don't want them to take me off the mestinon, cause I get extremely weak when they do.