Have you a range for FT3? they differ from lab to lab-the top of the range of FT3 for me is 5.7 but most of the ranges I've seen are 6.8 so you can see that it can make a huge difference. You are improving though. Folate and ferritin low though and not sure why folate would drop-typo?
Lots of various thoughts on Levo ranging from its unreliable once taking medication to its better to work on the frees. Logic says it can go lower as if you are on enough medication then the TSH has no need to ask your thyroid to produced more so in theory it could be zero but I don't think any of the machines will go that low. Just a thought (!) I wonder if at one time machines lower limit wasaround the 0.3 region so that was adopted asbottom of the range-interesting thought!
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