[Table/Fig-3]:
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 |