Reference values for NCS: 2019 update

Reference values are required for any diagnostic procedure. The limits are affected by test settings and patient demographics. For example, the latency value in a sensory nerve conduction study depends on the distance between the stimulation and recording site. Hence, the distance must be standardized to allow for the comparison of latency values. In another example, the F wave latency will be longer in taller individuals. Hence, the latency limit should be based on this patient demographic