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Euthyroid hyperthyroxinemia.

G C Borst, C Eil, K D Burman

    Annals of Internal Medicine
    |March 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Several conditions can elevate thyroxine levels without causing thyrotoxicosis. Recognizing these non-thyrotoxic hyperthyroxinemia syndromes is crucial to prevent misdiagnosis of hyperthyroidism and ensure appropriate patient care.

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    Area of Science:

    • Endocrinology
    • Internal Medicine
    • Clinical Chemistry

    Background:

    • Recent years have seen an increase in recognized disorders causing hyperthyroxinemia without thyrotoxicosis.
    • These conditions include genetic and acquired abnormalities in thyroid hormone-binding proteins, peripheral resistance to thyroid hormones, and non-thyroidal illnesses.
    • Drug-induced conditions can also lead to elevated serum thyroxine without thyrotoxicosis.

    Purpose of the Study:

    • To highlight syndromes that cause hyperthyroxinemia without thyrotoxicosis.
    • To inform clinicians about potential misinterpretations of thyroid function tests.
    • To prevent misdiagnosis of hyperthyroidism and subsequent inappropriate treatment.

    Main Methods:

    • Review of literature on conditions causing non-thyrotoxic hyperthyroxinemia.

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  • Analysis of characteristic thyroid function test abnormalities in these syndromes.
  • Comparison of diagnostic criteria for thyrotoxicosis versus non-thyrotoxic hyperthyroxinemia.

    • Main Results:

    • Identified disorders include abnormalities in thyroid hormone-binding proteins, peripheral resistance to thyroid hormones, acute nonthyroidal illness, acute psychiatric illness, and drug effects.
    • These syndromes often present with abnormal triiodothyronine, free thyroid hormone levels, and blunted thyroid-stimulating hormone response to thyrotropin-releasing hormone.
    • These test alterations can mimic true thyrotoxicosis.

    Conclusions:

    • Awareness of these diverse syndromes is essential for accurate diagnosis.
    • Understanding associated thyroid function test alterations prevents misdiagnosis of hyperthyroidism.
    • Proper identification avoids unnecessary and potentially harmful therapies for thyrotoxicosis.