The most sensitive test for the diagnosis of ' myasthenia gravis is
*Tensilon (edrophonium) test: a sho-acting anticholinesterase--look for rapid and transient improvement of strength; false-positive (placebo response, motor neuron disease) and false-negative tests occur. Atropine IV should be on hand if symptoms such as bradycardia occur. Ref Harrison20th edition pg 2378
Elevated serum ACH-receptor binding antibodies
Repetitive nerve Stimulation test
Positive edrophonium test
Measurement of jitter by Single fibre electromyography
C.N.S