Editing F wave (section)

== Measurements==
Several measurements can be done on the F responses, including:<ref name=":5" /><ref name=":8" />
* ''minimal and maximal F wave latencies (ms) -'' frequently used in the assessment of demyelinating neuropathic conditions including [[Guillain–Barré syndrome|Guillain-Barré syndrome]].
* ''chronodispersion -'' difference in maximal and minimal latencies across a series of F waves
* ''F wave persistence -'' measure of alpha motor neuron excitability calculated as the number of F responses elicited divided by the number of stimuli presented.

The minimal F wave latency is typically 25-32 ms in the upper extremities and 45-56 ms in the lower extremities.

F wave persistence is the number of F waves obtained per the number of stimulations, which is normally 80-100% (or above 50%).