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Your TSHPituitary and tsh Tsh is still normalNormal saline flush, but your free T4T4 test is low, are you taking any medication?, do you have symptoms? did you measure free T3? in your case it would be important your free T3 to see what is going on. You should repeat the thyroid analyses including the thyroid antibodies (TPO and anti-Tg). If your TSH gets lower and still low free T4 and free T3, you should look if you have a Pituitary/hypothalamic dysfunction.