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F-Wave Latency - Charcot-Marie-Tooth Disease | Experts in CMT

F-Wave Latency

The Nerve’s Round Trip

F-wave latency is the time it takes for an electrical signal to travel from a stimulation point along a motor nerve all the way to the spinal cord and back to the muscle. Because it covers the full length of the nerve, it is one of the most sensitive readings in a nerve conduction study, able to reveal slowing that shorter measurements miss. In CMT, F-wave latency is often prolonged, and it can even be absent, reflecting how far along the nerve the disease reaches.

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