Has your dose been the same throughout? I seem to remember I needed more thyroxine when on HRT so if your dose hasn't been altered then that would account for the last one being a little different. How long have you been off HRT when you had the last bloods? I can imagine your GP will flap when he sees the slightly out of range FT4 but he really needs to ask the lab to do a FT3 reading to find out whether it is also high or low to see where to go next. How you are feeling? It could be that you need more time to get the HRT out of your system and then retest.
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