Approximate sensitivity of the confirmatory tests for myasthenia gravis

	Generalized myasthenia percent positive	Ocular myasthenia percent positive
AChR antibodies	80 to 90	40 to 55
MuSK antibodies (in AChR antibody-negative patients)	40 to 50	<10
Repetitive nerve stimulation	75	<50
Single-fiber electromyography	92 to 99	80 to 95

AChR: acetylcholine receptor; MuSK: muscle-specific tyrosine kinase.

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