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Answer: For nerve conduction studies (95900, 95903, 95904), somatosensory evoked potentials (95925, 95926, 95927) and similar testing, conventional medical wisdom is that it takes four to six weeks for all the changes to occur in nerve and muscle after an injury. Any examination after that point will be appropriate. There is no time that is too late only a time that is too early.
Answered by Neil A. Busis, MD, chief of the division of neurology and director of the neurodiagnostic laboratory at the University of Pennsylvania Medical Center at Shadyside in Pittsburgh.