I have been on levothyroxine (now up to 100) since April as we're trying to conceive and previous TSH were usually higher than 3, sometimes up to almost 5. My T4 level is now 17 which is fantastic and what my private endo recommended the level was at. My THS is suppressed at 0.04. Would a very low THS negatively affect fertility? What is more important, the T4 or the TSH level?
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