NCV = nerve conduction velocity (oftentimes done to study peripheral nerve decrement)

EMG = electromyography (totally different form NCV). More specific to neuromuscular studies

SFEMG - a special kind of EMG...Single Fiber electromyography

Only after I flunked the NCV did they begin to investigate further with the EMG and then SFEMG.

You can google these to get a great deal of detail on each. Some of the articles can be quite interesting.

The NCV is done with jelly and sticky electrode pads. Both of the EMGs are done with electrode needles inserted into tissue.

Lots of technicians do the NCV and EMG. But it takes a very experienced technician or neuro to administer and read the SFEMG.

Hope this helps.