If als was supposedly active in my left hand, would it show up on an emg that was done in muscles in my upper left arm? they didn't test my left hand but my left bicep/shoulder muscles came out clear. i'm extremely stressed out on the verge of tears?

One might see signs of ALS on EMG, however EMG of a single limb can not in and of itself make that diagnosis. For that, we would need a detailed history and careful neurologic exam supplemented by testing (eg blood work/MRI) to exclude other things. I consider EMG necessary to confirm an ALS diagnosis, but multiple limbs as well as face and neck/back would need to be tested.

Your prior questions have resulted in suggestions to either complete the EMG or seek a second opinion. Have you been successful in that quest? Perhaps, you might have more rapid answers via a Virtual Consultation via HT. As mentioned, previously, ALS is a very unlikely diagnosis, but other causes need to be more fully assessed.