I had this test done, and it was worth it for me, because they found I was positive for MuSK. Mestinon did NOT work for me, both times I've tried it. I got the impression from my Dr though that he wasn't surprised when he saw I was MuSK positive and the medication not really working.

I thought it was more like $1,500 but I remember when my mother called she had a hard time with Athena getting a straight answer about payment, what was covered/not covered and all that. Anyway, it is very expensive, but it may help you with an answer. Good luck