This test is done to monitor treatment with synthetic hormones (synthetic triiodothyronine [T3] will cause a low total thyroxine [T4] Monitoring treatment of hyperthyroidism with thiouracil and other anti-thyroid drugs Index of thyroid function when the thyroxine-binding globulin (TBG) is normal and non-thyroidal illness is not present.
No specific preparation required
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