My first blood test was negative for MG, but double vision kept getting worse. Optha sent me to neuro optha...she said there is a high frequency of false negatives on MG and wanted to do it again. This time, it was positive. Now seeing two different neuros....one in my hometown and one a few hours a way that specializes more in MG. he stated that once I had a positive....it would be not need for ever testing again....

So sorry for your frustration....