a positive serologic test for anti-acetylcholine receptor antibody (AChR) and/or b. typical MG findings on neurophysiological testing of neuromuscular transmission with single fiber electromyography (SFEMG) and / or repetitive nerve stimulation (RNS), and / or c. Positive anti-choline esterase-test, e.g. edrophoniumchloride or improvement of MG symptoms with oral cholinesterase inhibitors as judged by the treating physician.