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. 2016 Jul 1;10(7):OC13–OC18. doi: 10.7860/JCDR/2016/20607.8097

[Table/Fig-3]:

The normative values of various NCS parameters used in this study.

NCS Parameter Normative
Value
Distal latency of median nerve compound motor action potential (CMAP) 4.4 milliseconds
Difference between the distal latencies of median and ulnar nerve CMAPs ≤ 1.1 milliseconds
Difference between the distal latencies of median and ulnar nerve sensory nerve action potential (SNAP) ≤ 0.2 milliseconds
Median CMAP amplitude > 4.0 millivolts
Median CMAP conduction velocity > 49 meters/sec
Median SNAP distal latency < 3.5 milliseconds
Median SNAP amplitude > 20 microvolts
Median SNAP conduction velocity > 50 meters/sec
F-wave latency of the median nerve < 31 milliseconds