The acetylocholine receptor antibody test was negative for binding, blocking, and modulating antibodies. I just got the report for the SFEMG and EMG tests done at Duke last week. This is what they said:

SFEMG: Single fiber EMG was performed of the left frontalis
muscle. 20 fiber pairs were examined with a mean MCD of 30 usec
(ref < 30 usec); median MCD was 29 usec (ref < 30 usec). 5 % of
fiber pairs demonstrated increased jitter without blocking and
the remaining 95 % were normal. SFEMG of the left frontalis
muscle was normal. [emphasis added]

I think I read somewhere that if 2% or more of the fiber pairs showed jitter, then you had MG, but I can't remember where I read it.

If anyone else has had SFEMG, could you please comment on these results?

They also did regular EMG testing and there were some abnormalities:

EMG: Needle EMG of selected muscle of the left arm and leg and
paraspinals is remarkable for a clear population of short
duration, polyphasic motor unit potentials with multiple thin
spikes worse in the upper extremity and C8-T1 paraspinal. [emphasis added]

Has anyone else had this type of EMG test result? Any idea what it could mean?

Their conclusion was that it was an abnormal study, but they blamed it on the 20 mg of hydrocortisone I take for adrenal failure. I plan to get a second opinion, because I disagree with their conclusions, but I wanted to see what you guys thought. Any ideas or suggestions are welcome.

Thanks.

Rose