I am double sero-negative. I was diagnosed by Tension test in the ER. My rep stem and emg have been negative. My Neuro does not do Sfemg but says it is not needed to confirm diagnosis.
I have also been reading that it is thought some of the seronegs may eventually show Achr antibodies. It may be that the test isn't specific enough to detect low levels of antibodies.
It is frustrating to deal with this disease, any information about dealing with it is welcome. Thanks for gathering this info
Sandy