As you probably know, many doctors do not test Rt3. Mine never do, but i'm trying to come up with a good enough reason to get her to test it for me, as I have an appt this coming monday. I have been on ndt since november, and feeling so much better, however, I still have a severe problem with cold intolerence and my body temp fluctuates from 94.6 - 99.3. I have spells where just my hands and feet are cold, but also my hips and thighs turn ice cold, even when i'm in my home with the heat running. Could this be a Rt3 issue? Is it blocking the T3 perhaps?