I was in the position Alice describes: seronegative (antibody tests negative) and with a SFEMG that was abnormal, but not, said the neuro, abnormal enough to diagnose MG on the basis of it.

Then I went to a different neuro (my first neuro referred me) who did another SFEMG. This one came back abnormal enough to make the diagnosis clear.

There were two differences between this SFEMG and my previous ones:
1) This one was done on my face, even though I have only very mild eye involvement;
2) instead of having me slightly clench my muscles, he put electrodes on my face and used pulses of electricity to make the muscles twitch (it wasn't painful like the shocks used for a regular EMG).

So I'm wondering whether the face muscles are easier to interpret, or whether the electrode method gives clearer results. Or it could just be that the two doctors interpret the results differently. Both of them are considered experts in SFEMGs.

I am very grateful to be diagnosed. Not only am I seronegative, but my presentation is atypical (very minor eye involvement, and my worst trouble is with the muscles in my sides and hips).

Abby