Motor nerve conduction studies: measurement principles and interpretation of findings.

Motor nerve conduction studies are reviewed. The principles of electrode placement, stimulus intensity, algorithms for measurement of parameters, causes of variability, reference values, and reporting are discussed. A rigorous standardization of methods has several advantages. The sensitivity of each method is increased without loss of specificity. In addition, reference values obtained in one laboratory can be used in other laboratories as well. Pathophysiological interpretation of findings in different types of neuropathies is also presented.