CJ is spot on, the nerve conduction study requires your body to be at a different warmer temperature, the nerve conduction is a touchy(no Pun) test, it can pick up construction going on outside, other electrcal sounds etc.. They know how to decipher between the two. But if you are cold, the tech or neruro, (either can do this test), will sometimes not be able to get a accurate reading. They take about three readings, and then get a baseline. Normal nerve test's in ALS, sometimes in LATE ALS the Motor neurons might get a little funny, but that would be long after the emg would have picked something up. As we all are aware the needle part is the ALS part, ALS is both nerves and muscles involved, so this test shows how the signals are being sent, and the strength of the muscles being tested. It is a very sensitive test. Hoping