MG or what? Need help to figure out what to do next.

Is it possible to have Myasthenia Gravis with negative lab results? I have had an IEMG with 'extremely abnormal' findings, but feel lost when noone can explain to me what is happening, and more importantly, what can I get done about it.  I am a 37-year-old mother of 3, I have had hyperthyroidism, was given i-131 (twice) that 'killed' my thyroid, now I am hypo, but stable for the past 5 years, although I still have the Graves' eye disease.  In the past 8 months, I have had increasing muscle weakeness, pain, and tightness.  I have seen 2 rhuematologists, and am about to see a neurologist. What can I expect at this point, if they are unable to find ANYTHING abnormal in my bloodwork?

[Londres70]

Yes, it is possible for the labs to come back negative and a patient indeed has MG.  

The Neurologist will do a physical assessment, ice test, a Tensilon test and possibly order an EMG and/or a NCS.  He/she may order more labs.  

[dogmum]

Just wanted to second what Londres already shared.  I believe that 85% of people with MG have a positive antibody test, while 15% are negative to the test, but respond to treatment (this is where the Tensilon test comes in).  

Wishing you well...