Many of us here, including me, are seronegative (we tested negative for the antibodies--that happens up to 20% of the time with MG patients). There are blood tests for MuSK and LEMS antibodies, too. Even if you test negative for all three of them, you could still have MG. If you symptoms are consistent with MG but your blood tests negative, the next step is to have a test called a Single Fiber EMG (SFEMG). This is usually done by a neurologist who specializes in diagnosing neuromuscular diseases. If your SFEMG is positive for MG, that's grounds for a diagnosis.

A SFEMG is done with very thin needles that are inserted into your muscles. You clench the muscle slightly, and the machine measures how the muscles respond to the signal from the nerves.

If you'd like to list your symptoms, the people here can give you an idea about whether they're consistent with MG.

Abby