- The presence of acetylcholine receptor antibodies.
- Edrophonium test: in which edrophonium chloride is injected intravenously to prevent acetylcholine degradation, hence the level of acetylcholine increases at the neuromuscular junction.
- Nerve conduction study: conducted for fatigue, in which repetitive neuronal stimulation is done. It results in decrements of muscle action potential due to impaired nerve to muscle conduction.
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