Mark, Were both tests done at the same lab? That can make a difference.

Antibody levels fluctuate. And those levels do not reflect the severity of MG!

What if your antibodies during that second test were too busy attacking your tissues (tissue bound antibodies) and there weren't enough circulating antibodies to show up on the test?!

That's why MG is a clinical diagnosis backed up with tests! A negative doesn't prove anything.

Don't sweat it!

Annie