You'll find that "normal" ranges of most blood tests vary somewhat from lab to lab, but with thyroid tests, they vary more. A TSH of 5 used to be considered normal, but some years ago the top of the range was moved down (remember, the higher your TSH the lower your thyroid function) to around 3. I think some doctors still look at a TSH of 4 or 5 and think "normal."

Here is a link to the 2003 press release of the American Association of Clinical Endocrinologists (AACE) trying to raise awareness of the new standards.

http://thyroid.about.com/gi/o.htm?zi...icle_id%3D4584

Abby