title: The relationship of thyroxine turnover to other parameters of peripheral thyroid function in Graves' disease.
abstract: In 28 patients with Graves' disease showing a wide range of thyroid function between the extremes of hypothyroidism and hyperthyroidism, the following parameters of peripheral thyroid function were measured: serum thyroxine concentration, serum-free thyroxine concentration, serum triiodothyronine concentration, and serum-free triiodothyronine concentration. In 25 patients, thyroxine turnover was also measured. Thyroxine turnover was found to be highly correlated with serum-free thyroxine concentration (r equals 0.9405) and serum-free triiodothyronine concentration (r equals 0.9184). Serum-free thyroxine fraction correlated with serum-free triiodothyronine fraction (r equals 0.8445), suggesting that similar factors in serum controlled the intensity of protein binding for both thyroxine and triiodothyronine. Thyroxine turnover calculated by a noncompartmental method agreed closely with values calculated by the compartmental method, suggesting that the former simpler method has general utility.
mesh_terms: D000328:Adult; D000368:Aged; D002986:Clinical Trials as Topic; D005260:Female; D006111:Graves Disease / Q000097:blood / Q000378:metabolism*; D006801:Humans; D006980:Hyperthyroidism / Q000175:diagnosis; D007037:Hypothyroidism / Q000175:diagnosis; D008297:Male; D008713:Methimazole / Q000627:therapeutic use; D008875:Middle Aged; D011441:Propylthiouracil / Q000627:therapeutic use; D011863:Radioimmunoassay; D013960:Thyroid Function Tests; D013972:Thyrotropin / Q000097:blood; D013973:Thyrotropin-Releasing Hormone / Q000627:therapeutic use; D013974:Thyroxine / Q000097:blood / Q000378:metabolism*; D013975:Thyroxine-Binding Proteins; D014284:Triiodothyronine / Q000097:blood / Q000378:metabolism
chemical_list: D013975:Thyroxine-Binding Proteins; D014284:Triiodothyronine; D008713:Methimazole; D013973:Thyrotropin-Releasing Hormone; D011441:Propylthiouracil; D013972:Thyrotropin; D013974:Thyroxine