Richard, thank you for your comment. I agree that the Faradic/Galvanic test is a second possibility (next to the S/D curve) to know whether the muscle is denervated or not. However, I must admit that I didn't think of the F/G test earlier and tried it this morning right after reading your comment. The test took me a little more time than calculating the AQ because the electrotherapy device I used has preprogrammed protocols for S/D curve and not for the F/G test. By the way, same with most electrotherapy devices on the European market that I know.
On the other hand, now that this discussion is somewhat re-opened, let me get back to my question. Taking into account that it only takes 3 minutes, wouldn't it be a good idea to start a S/D curve in every situation of muscle weakness with unknown cause? If the AQ (which is the part that only takes 3 minutes) shows > 2.7 one can stop at that point. Hardly takes time, no harm done and no need to go through a complete anamnesis. But if the AQ shows < 2.7 a complete S/D is necessary.