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Altered laboratory thyroid parameters indicating hyperthyroidism in elderly subjects.

D Maugeri1, M Salvatore Russo, G Carnazzo

  • 1Institute of Internal Medicine and Geriatrics, Catania University, Ospedale Cannizzaro, Via Messina 829 95126 Catania Italy.

Archives of Gerontology and Geriatrics
|March 1, 1996
PubMed
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Diagnosing hyperthyroidism in older adults is challenging due to subtle signs. A TSH level below 0.2 IU/ml is a key indicator, despite a high prevalence of laboratory abnormalities.

Area of Science:

  • Geriatric Medicine
  • Endocrinology
  • Thyroidology

Background:

  • Hyperthyroidism diagnosis in the elderly presents unique challenges.
  • Subtle clinical manifestations can mimic other conditions in older adults.
  • Laboratory alterations in thyroid function are common but not always indicative of true hyperthyroidism.

Purpose of the Study:

  • To evaluate laboratory thyroid function alterations in subjects over 65 years.
  • To determine the prevalence of true hyperthyroidism in the elderly population.
  • To identify reliable diagnostic markers for hyperthyroidism in this age group.

Main Methods:

  • Analysis of total T3, total T4, and TSH levels in 3015 elderly subjects.
  • Thyroid ultrasound and scintigraphy were utilized when indicated.

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  • Correlation of laboratory findings with clinical signs and prevalence data.

    • Main Results:

    • A high prevalence of laboratory alterations suggestive of hyperthyroidism (8.09%) was observed.
    • The actual prevalence of diagnosed hyperthyroidism was 2.00% (female/male ratio 2:1).
    • Thyroidal adenoma (50%) was the most common cause, followed by toxic multinodular goiter (33%) and Basedow's disease (17%).
    • Neuromuscular symptoms were the most frequent clinical signs, often seen in 'euthyroid' individuals.

    Conclusions:

    • Diagnosing hyperthyroidism in the elderly is clinically and laboratorially difficult.
    • Ultrasensitive TSH levels below 0.2 IU/ml appear to be the most significant laboratory indicator.
    • Further investigation is warranted to refine diagnostic strategies for elderly hyperthyroidism.