The main problem with the TSH test is that the reference range for it is too wide at most labs. The upper end of the range at some labs goes as high as 6, but according to the hundreds of references that we’ve compiled, symptoms of hypothyroidism accompanied by a TSH level over 2, sometimes lower, are suspect. Whenever you get lab tests, ask for a copy of the results. Don’t just let someone tell you that your TSH level is “normal.”
http://www.altsupportthyroid.org/tsh.php