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Patterns of primary thyroid failure.

A Kahn

    Israel Journal of Medical Sciences
    |July 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Thyroid hormone levels in hypothyroidism vary. Serum thyroxine (T4) is a better indicator of metabolic state than triiodothyronine (T3), which can be normal or elevated in hypothyroidism.

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    Area of Science:

    • Endocrinology
    • Internal Medicine
    • Thyroidology

    Background:

    • Primary thyroid failure is characterized by elevated thyroid-stimulating hormone (TSH).
    • Patients with suspected hypothyroidism present with diverse thyroid hormone profiles.

    Purpose of the Study:

    • To classify patients with primary thyroid failure based on serum thyroxine (T4) and triiodothyronine (T3) levels.
    • To evaluate the diagnostic utility of T3 and T4 in assessing the metabolic state of hypothyroid patients.

    Main Methods:

    • Serum TSH, T4, and T3 levels were measured in 170 patients with elevated TSH.
    • Patients were categorized into four classes based on T4 and T3 levels.
    • A subset of patients was monitored over six months to observe disease progression.

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    Main Results:

    • Four distinct classes of thyroid failure were identified based on T4 and T3 levels, with TSH elevated in all.
    • Serum T3 levels were not consistently low; they were normal or elevated in some hypothyroid patients.
    • Serum T4 levels correlated better with the clinical metabolic state than T3 levels.
    • A better reciprocal correlation was observed between TSH and T4 than between TSH and T3.

    Conclusions:

    • Serum T3 is an unreliable indicator of hypothyroidism and metabolic status.
    • Serum T4 is a more significant determinant of the metabolic state in primary thyroid failure.
    • TSH and T4 levels provide a more reliable assessment of primary thyroid failure than TSH and T3.