I have no idea, but am wondering the same. I just got my TSH today and it is 1.67 which my doc says is normal. He said before the test that I didn't need any of the other tests, He is convinced my problem is not thyroid, but has no idea what is wrong. Symptoms - excessive sweating, fatigue, poor sleeping, tingling hands in morning, dizzy upon arising (usually just after lying down), pains here and there, and I do have osteoarthritis. I also have IBS and other digestive issues.