I recently saw a doctor new to me- an internal medicine dr. He had pulled some of my records from some other physicians. I told him that my thyroid tests have always showed normal. He told me that the thyroid tests that he had from my other physicians all showed low. I don't know if the normal range varies by lab, physician, changes year to year, or if doctors who claim there is nothing wrong with my thyroid don't want to admit that they are wrong after I insist on the test. I have also figured out that although there are "normal ranges" alot of times the normal ranges do not take weight and other specifics into account.