Most doctors don't measure it, so it's not something there's a lot of info on out there. What I have read is that people with MG have about 1/3 of the receptors (sometimes less) of normal people and, therefore, about that much less of acetylcholine. It depends upon how much of the neuromuscular junction has been destroyed.

Going by how you "feel" or how weak you are is more important than using any kind of measurement. And everyone's "weak" is different.