I just wanted to add my opinion about a low TSH.

A low TSH is actually good if you are on medication such as NDT forms. There is much controversy about thyroid such as the likes of guide lines for B12, cholestrol and other topics. Do research before trusting one opinion on thyroid and what "normal" is. Normal is very difficult when it comes to thyroid since everyone is different. Most people find, when on medication, they feel best with a LOW TSH and a high end of the normal range for T3 free.

My TSH started at a 13 (very high) and is down to a 2 and I am due to get blood tests right now and am hoping for an even lower TSH. Most people at the forum I go to have a TSH of 0.5 to a 1 and if the T3 free is in the correct range feel great. It has something to do with TSH being more supressed when on NDT medications.

However, as MrsD said, a low TSH can be an indicator of hyperthyroid but you have to look at many other indicators. If my current dr suggests to me that my TSH is too low, with the knowledge I have learned, I will not continue with him if he chooses to reduce my medication.

I would not consider your tsh low until you know what your T3 free is.