IF they tested your leg when it was weak and it was good, then you should try and forget about ALS (I know easier said than done, since I had a hard time wiping that off my list of fears as well).. but for MND EMG abnormalities show up before you even are aware of weakness... so if you were already weak in a leg that they tested and it's negative, then your good as far as that goes! How was your NCV? any abnormalities there?