If you go to the armour thyroid site run by Forest Labs, they have a link for physician locator by zipcode. You might find a doc that way. If the doc prescribes armour, then if he doesn't know about RT3, you might be able to educate him. Along with the RT3, you should get both antibodies tested and a 24hr saliva cortisol test might be in order too. Check out this link for recommended labs: