Thanks, Anacrusis. I'm a little nervous about it but hopeful.

If I understand correctly, I stand a higher chance of SFEMG registering outside the normal range if I have LEMS vs MG. That's helpful for two reasons:

1) The MG-'expert' neuro said Mestinon does not stay in the system to affect SFEMG results so I shouldn't be off it for more than 24 hours (contradictory to the research study in PubMed(?) indicating Mestinon can affect SFEMG results up to 2 weeks after going off the medication).

2) The neuro's not testing around my eye, he's testing on my arm and/or leg. Per Annie, "Subcutaneous fat of 9 mm (millimeters) can reduce an EMG signal by 80%." I've gained weight this year so I'm not thin. Will my fat do me in? We will see.

But I do have two prospects,.. the VGCC antibody test as well as the upcoming SFEMG. Hopefully, one or the other (or both!) will work out....