Serum Free Thyroxine and Triiodothyronine Concentrations in Subacute Thyroiditis

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Abstract
Serum absolute free T4 (AFT4) and T3 (AFT3) concentrations were studied in 10 patients with subacute thyroiditis whose total serum T4 levels were elevated, and values were compared with those obtained in 10 patients with untreated Graves' disease, whose total serum T4 concentrations were elevated to the same level as in the former group. The mean (±SD) basal metabolic rate in patients with subacute thyroiditis was 16 ± 14.8%, significantly (P4 and AFT, i were both elevated in subacute thyroiditis to a degree comparable to that seen in Graves' disease. The serum total Tn, serum free T3 fraction and AFTy were also elevated, but both total T3 and AFT3 were significantly (P3 to T4 and AFT3 to AFT4 were significantly (P3 to T4 and AFT3 to AFT., as well as the short duration of chemical hyperthyroidism.