My doctor did not order blood work, and I still have them pretty much every day. I did just have a nerve conduction study/EMG on my left arm because of a pinched nerve in my neck. They said it was totally normal. I don't know if that would be enough of a test to show anything, but I do have twitching in that arm too and it was normal. I don't have weakness or anything else, so I don't really worry about it. I would think I would have other symptoms by now.