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    I am 5 years post TT and I have not had free Ts tested for several years. I could have high FT4 and a high TSH or on the same dose of levo, a low FT4 with the same TSH. If I dosed by FT4, I would be changing my dose constantly. It was of no use to me. After thyroidectomy, your FTs may not be reliable. The following is one of the best articles I have read regarding thyroid hormone replacement. The physician authoring the article also suggests that FT4 monitoring post thyroidectomy is not useful after the initial postop period. Hope it helps. You have to go by how you feel.