So I saw an endocrinologist and explained my concerns about my t4 8.0 (7.5-22.0) and tsh 0.3 (0.3-5.0) reading whilst on levo 125mg. He did all the tests to see if it's a pituitary problem and they've all come back normal apart from oestrogen which is low (strange as I have an implant and that that increased oestrogen). Since being on ndt by t4 is 10.5 and my t3 is 5.5 which is says is top of the range (5.7)
So I said well maybe my t4 was so low previously cause I wasn't taking enough and he said yes.
However that doesn't really explain why my tsh was so low too and not calling for more t4.
He wants to prescribe me t4/t3 combo rather then ndt and will check my oestrogen again at a later date.
Am I right to be concerned about the feedback loop or does it even matter as long as I'm being treated?