Danielle, Sorry your daughter is experiencing such trouble. What other antibody tests did they do? Were any of the other antibody tests positive? Did they do an SFEMG? Did they put her on mestinon, pregnisone or any immunosuppressant? What kind of scan of the thymus did they do - an MRI? Sorry for so many questions, but which Mayo clinic did you go to?

Here are a couple of links, one from Mayo, that striational antibodies indicate Myasthenia Gravis. So I am confused why they would not treat her for that.

http://www.hindawi.com/journals/ad/2011/740583/.
http://www.mayomedicallaboratories.c...vis/7b-16.html.

This form is a very supportive group for anyone going through the diagnosis and treatment of MG.
kathie