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  • Title: Abnormalities in thyroid function tests in patients admitted to medical service.
    Author: Gooch BR, Isley WL, Utiger RD.
    Journal: Arch Intern Med; 1982 Oct; 142(10):1801-5. PubMed ID: 6812519.
    Abstract:
    Serum thyroid hormone, thyrotropin (TSH) and thyroxine-binding globulin (TBG) concentrations, free thyroxine index values, and free thyroxine concentrations were measured at the time of admission in all 77 patients hospitalized on a medical service on four separate days. Serum thyroxine (T4) concentrations and serum free T4 index values were decreased in 19.5% and 11.7%, respectively, and increased in 3.9% and 11.7%, respectively; serum free T4 concentrations were decreased in 6.8% and increased in 5.4%. Six patients (7.8%) had increased serum TSH concentrations. Serum triiodothyronine (T3) concentrations were decreased in 26.0% and reverse triiodothyronine (rT3) concentrations were increased in 29.9%. None had manifestations of thyroid disease. These results indicate that available thyroid function tests may give misleading results in patients with nonthyroid illness and suggest that caution be exercised in diagnosing thyroid disease in hospitalized patients.
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