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Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis
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Challenges in interpretation of thyroid hormone test results

Tijana Lalić, Biljana Beleslin, Slavica Savić

    Srpski Arhiv Za Celokupno Lekarstvo
    |August 4, 2016
    PubMed

    Insights

    Thyroid function tests can be misleading due to heterophile antibodies or thyroxine-binding globulin (TBG) deficiency. Investigating these interferences is crucial for accurate thyroid disorder diagnosis and preventing unnecessary treatment.

    Area of Science:

    • Endocrinology
    • Clinical Chemistry

    Background:

    • Interpreting thyroid hormone results requires considering carrier protein concentrations and potential interferences.
    • Thyroid function tests (TFTs) assess levels of thyroid-stimulating hormone (TSH), thyroxine (T4), and triiodothyronine (T3).

    Observation:

    • A 62-year-old patient with goiter and Hashimoto thyroiditis presented with low TSH and normal to low free T4 (fT4), initially suggesting secondary hypothyroidism.
    • A 40-year-old patient with a thyroid nodule showed low total thyroid hormones and normal TSH, indicating a potential issue with thyroid hormone transport.

    Findings:

    • Heterophile antibodies caused falsely low TSH in the first patient, masking normal thyroid hormone levels.
    • The second patient's low total T4 and T3 were attributed to hereditary thyroxine-binding globulin (TBG) deficiency, a condition without clinical impact.

    Implications:

    • Discrepancies between TFT results and clinical status necessitate investigation for interferences like heterophile antibodies or TBG deficiency.
    • Accurate diagnosis prevents misdiagnosis of thyroid disorders and avoids potentially harmful treatments.
    Abstract

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