Check the technical quality of the study before making a biologic interpretation, because artifact can create false amplitude loss or apparent slowing. A motor study and a sensory study are measured differently, so the same numeric value does not mean the same thing.

Typical upper-limb motor conduction velocities are about 50 meters per second and lower-limb velocities about 40 meters per second; Sensory conduction velocity can be measured directly, while motor conduction requires two stimulation sites; Stimulus artifact can falsely lower amplitude and increase apparent latency; Conduction velocity reflects the speed of action potential propagation along a nerve; Technical quality should be verified before interpreting borderline abnormalities