<prompt> Edrophonium test is diagnostic ofMyasthenia gravisLambert Eaton syndromeAmmyotropic lateral sclerosisAll  <response>: Ans. a Myasthenia gravis. Ref. Harrison, Internal Medicine, 16th ed., 2519Test for diagnosis of MGCommentsAcetyl Choline EsteraseTensilonEdrophoniumTest Most commonly used rapid test. Highly probable diagnosis if unequivocally positive. False positive in ammyotropic lateral sclerosis and placebo reactorsAnti-Ach receptor ab assay 85 positivity in generalized myasthenia gravis. 50 positivity in ocular myasthenia gravis. Definitive diagnosis if positive.Repetitive nerve stimulation test Highly probable.Single fiber EMG Confirmatory but non-specific 