Maybe someone here knows more about this than I can discover.

MG tests are all based on searching for the antibodies that work against enzymes that clean up excess Acetylcholine.

Is there no test for Acetylcholine itself.

It occurs to me that those who are seronegative, may simply have a naturally low level of Acetylcholine. Low level Acetylcholine can cause other symptoms, hives for example. Or depression.

Just a thought and perhaps someone can provide more information.