Thyrotropin reference interval in older adults.

Area of Science:

• Gerontology
• Endocrinology
• Thyroid Research

Background:

• The global population aged 65 and above is projected to reach 16% by 2050.
• Thyroid disorders are a growing concern in the elderly population.
• Thyrotropin (TSH) is a sensitive marker for thyroid function, crucial for diagnosing subclinical thyroid disease.

Purpose of the Study:

• To review existing literature on thyrotropin reference intervals in older adults.
• To explore the distinction between adaptive and pathological thyrotropin level variations in the elderly.
• To inform diagnostic and treatment thresholds for thyroid dysfunction in aging populations.

Main Methods:

• Systematic literature review of studies on thyrotropin reference intervals in elderly populations.
• Analysis of factors contributing to variations in thyrotropin ranges among older adults.
• Synthesis of current research on age-related changes in thyroid function markers.

Main Results:

• Thyrotropin levels may be slightly elevated in older individuals.
• Higher upper limits of reference intervals for thyrotropin have been observed in elderly cohorts.
• Population heterogeneity likely contributes to the wide variation in reported thyrotropin ranges.

Conclusions:

• Age-related changes in thyrotropin necessitate a re-evaluation of diagnostic criteria.
• A higher thyrotropin threshold for diagnosing subclinical hypothyroidism in the elderly appears reasonable.
• Further research is needed to establish precise, age-specific reference intervals for thyrotropin.