Abby is absolutely spot on. I have never tested positive for antibodies...and didn't flunk the SFEMG (although I was 'borderline'). But I respond beautifully to Mestinon - - and a non-MG'r would never be able to do that!!

Pls let us know how your test results come out - - but don't think you don't have MG if the test comes back negative. You still may (or may not!) MG can be such a weird and petulant companion!!