Diagnostic sensitivity of the laboratory tests in myasthenia gravis

The diagnostic sensitivity of three laboratory tests [serum antiacetylcholine receptor antibody (AChR‐ab) assay, the repetitive nerve stimulation (RNS) test, and, the single fiber EMG (SFEMG)] for myasthenia gravis (MG) was compared in 120 patients. In all cases, at least one of the tests was abnormal. SFEMG was the most sensitive test, being abnormal in 92% of cases, followed by the RNS test (77%) and the AChR‐ab assay (73%). SFEMG was abnormal...