I'm just getting back to this thread, to follow-up.
An interesting board to check for changes in thyroid numbers is the About.com thyroid board. Mary Shomon, an almost-neighbor in Maryland, runs it, has written a book and just published the changes - on the board - about the broadening of TSH levels, meaning that twice as many people as before are considered hypo-thryoid. This is tremendously important information.
I also wonder why it's taken so long for doctors to check the T4 and T3 numbers. It's clear that I haven't been able to convert T4 from Synthoid, into the needed T3. Now that I take the combination of Synthroid and Cytomel (the latter is hideously expensive, BTW), I finally have a normal body temperature. Mine has been 97.2 for years. Try staying warm in the Winter with a sub-normal body temp! For years, they told me I had "Raynaud's Phenomenon", which I still do but it didn't explain all of the coldness I felt.
Sometimes, even I have trouble getting to the right article, so I went off and found it. Here it is:-
http://thyroid.about.com/library/weekly/aanewTSHrange.htm
Good luck.
Thanks. The feeling of cold is a sometime phenomenon, so I'm not sure where that leaves me. I too have Raynaud's (syndrome or phenomenon, not sure which), but I had chalked that up to a near/semi frostbite experience many years ago. Thanks for the reference and for looking up the link. Mary has a couple of lists at Yahoo Groups, I see.