<prompt> The most sensitive test for the diagnosis of myasthenia gravis isElevated serum ACH-receptor binding antibodiesRepetitive nerve Stimulation testPositive edrophonium testMeasurement of jitter by Single fibre electromyography  <response>: 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 