Hey, I didn't want to muck up your IVIG post anymore! I'm posting this mostly for your sister.

I would highly suggest that your sister get a book about MG and read it. But since she is so stubborn, I guess that won't happen.

I'll say it again, MG is a clinical diagnosis backed up with tests. A negative test doesn't prove anything.

If she is on drugs, they can possibly affect both the antibody and SFEMG results. If she has an IgG1 or IgG3 deficiency, it can affect the antibody results.

She had a positive modulating antibody, right? And it was negative the 2nd time? Did she SEE the 2nd results? If her numbers were still showing up but not above normal, chances are that simply shows a normal fluctuation in disease activity. Antibody numbers go up and down in everyone, including lupus patients and other antibody related diseases.

She may not have MG. It's entirely possible. But . . . how does she FEEL? What do her eyelids look like? How is her breathing?

Doctors can get it wrong. I know that's not fun to hear but we all know that it happens. I would really hate if she had MG, went about her life as if she was fine and then ended up somewhere, unable to move or breathe.

I simply had to put this out here one more time, in case she's reading the forum. If you are reading, PPMan sister, I have modulating antibodies only and definitely have MG. And my antibodies do fluctuate.

I hope she is absolutely fine and her positive antibody test was lipemic or was done after anesthesia or something that would create a false positive. If it was done at Mayo, chances are it was not a false positive.

Good luck to both of you!

Annie