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  • Title: Measurement of free thyroxine and free triiodothyronine in asymptomatic subjects with high concentrations of serum TSH and a history of radioiodine therapy.
    Author: Franklyn JA, Sheppard MC, Ramsden DB, Hoffenberg R.
    Journal: Clin Endocrinol (Oxf); 1984 May; 20(5):527-30. PubMed ID: 6430600.
    Abstract:
    Total and free thyroid hormones were measured in a group of asymptomatic subjects with high circulating TSH concentrations and a previous history of radioiodine therapy. Subjects in the high TSH group all fell within the normal range for measurements of total T4, total T3 and T4/TBG ratio. Concentrations of free T4 or free T3 were below the normal range in more than half (9 out of 17) of the high TSH group suggesting that these measurements are more sensitive indices of thyroid failure than measurement of total hormones or T4/TBG ratio.
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