My EMG was negative as was my first blood panel taken by my local neurologist. I had double vision so I was referred to a Neuro-opto who diagnosed me with MG. He said he did not care that those tests were negative he was positive I had MG. Six months later my blood work came back positive. I have not had the single fiber test so I can help you there. My sister had the single fiber test at the University of North Carolina and it was negative however we are still convinced she has MG. She is going to Duke in June and maybe she will get a diagnosis there.
Mike