I went to the ER room because I felt so terrible, weak all over & with strange twitching in my limbs. I had already had 2 thyroid tests which I was told were normal (you ruly can't count on blood tests often, and even if they target a problem you can't count on them to necessarily know how seveere it really is.) At the ER room, after having suffered with a wrong diagnosis for many months, they finally caught the problem in a blood test there.