Can a emg test show old nerve damage?

An electromyography (EMG) test can indicate signs of old nerve damage, but it primarily assesses the electrical activity of muscles and the function of their associated nerves. If there has been long-standing damage, the EMG may reveal abnormal muscle activity or changes in muscle fibers. However, it may not provide specific information about the timing of the injury. For a more comprehensive evaluation, additional tests like nerve conduction studies may be used alongside EMG.