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    Low free T4 Normal low TSH: Is this really hypothyroidism?
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    frankie_f1 posted:
    Hi!

    I have been having low free T4 (9 pmol/L), but normal although on the lower end TSH (1.69 mIU/L).

    My doctor has put me on 75mg/day synthroid, because his diagnostic is hypothyroidism. However, I understand that hypothyroidism is normally associated with low T4, but high TSH.

    Based on what I have read, it seems that a low T4 associated with a normal TSH may be linked to issues with the pituary gland (and not the thyroid) or issues with binding agents.

    Is hypothyroidism and the use of synthroid indicated in my case?

    Thank you,

    Frank


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