Re: Question - TSH Down to 1.53
From everything I've read, you can only know what's optimal for you once you achieve it. When you get to the point where you feel 100% as well as you did before thyroid trouble reared its ugly head. It would be useful to have bloodwork done then... to see where the free hormones are, and not to let them deviate from that level again by adjusting med as needed. (In the real world, though, insurances would probably balk at paying for tests on a well person.)
Keep in mind that TSH means nothing once you're in treatment. TSH itself causes no symptoms. If you have little natural thyroid function left, TSH doesn't even fulfill its sole purpose any longer, which is to spur the thyroid into action.
It's the free thyroid hormones themselves - FT4 and FT3 - that contribute to cell function and the sense of total wellness. A doctor who treats by simply adjusting TSH isn't doing it the right way.
If you feel well, that's the most important thing. It must mean your free hormones are close to optimal. If they are, your cells will continue to recover. If you don't continue to feel improvement, it must mean the FTs need to be a little higher.