I have hypothyroid from 6 months and recently when tested got t3-1.25, t4-8.54, tsh-0.018. Is it dangerous to hav such low TSH and do it affect fertilit?

It depends. I assume you are taking thyroid hormone for your diagnosis of hypothyroidism. The low TSH tells us that you are taking too much thyroid hormone. However, the normal T4 and T3 (liothyronine) levels tell us that you need only a slightly lower dose. Any time the thyroid level is off, it can affect fertility, so you want to have it normal.

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