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Euthyroid "thyroxine toxicosis"

G D Mankikar, A N Clark

    Journal of the American Geriatrics Society
    |July 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Thyroid function tests in elderly patients revealed abnormalities in 13% of cases. Many abnormal results, particularly elevated thyroxine (T4) and free thyroxine index (FT4I), were transient and not indicative of clinical thyrotoxicosis.

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    Area of Science:

    • Geriatric Medicine
    • Endocrinology
    • Clinical Chemistry

    Background:

    • Thyroid dysfunction is common in the elderly.
    • Interpreting thyroid function tests (TFTs) in geriatric patients can be challenging due to atypical presentations.

    Purpose of the Study:

    • To analyze the patterns and significance of thyroid function test results in a geriatric population.
    • To evaluate the incidence of abnormal TFTs and their correlation with clinical findings.

    Main Methods:

    • A retrospective survey of 1,153 patients screened for thyroid disease over two years.
    • Analysis of thyroid function test results, including serum thyroxine (T4) and free thyroxine index (FT4I).
    • Correlation of biochemical findings with clinical signs and symptoms of thyrotoxicosis and hypothyroidism.

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    Main Results:

    • 13% of TFT results were outside the normal range.
    • Of 88 patients with abnormal results, only 12 had clinical thyrotoxicosis.
    • 37 patients exhibited biochemical "euthyroid thyroxine toxicosis" with transiently high T4 and FT4I, resolving within weeks.
    • 61 cases of hypothyroidism were identified.
    • Similar transient T4/FT4I elevations were noted in 7 cases of T4-treated hypothyroidism.

    Conclusions:

    • Transient elevations in T4 and FT4I can occur in geriatric patients without clinical thyrotoxicosis, leading to potential false positive results.
    • When laboratory findings conflict with clinical presentation, repeating TFTs after two weeks is recommended.
    • Careful interpretation of TFTs is crucial in the elderly to avoid misdiagnosis and unnecessary treatment.