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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
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Thyrotropin Controversy in Subclinical Thyroid Disorders.

Rajesh Agrawal1

  • 1Consultant Diabetologist, Secretary RSSDI MP State, CEO, DOT Clinic, Indore, Madhya Pradesh, India, Corresponding Author, Orcid: https://orcid.org/0009-0007-1237-210X.

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The diagnosis and treatment of subclinical thyroid disorders (STDs) remain controversial, with TSH levels alone being insufficient for decision-making. Further research and comprehensive testing are crucial for accurate diagnosis and management of these common endocrine conditions.

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Area of Science:

  • Endocrinology
  • Clinical Chemistry

Background:

  • Subclinical thyroid disorders (STDs) are prevalent endocrine conditions, affecting approximately 9.4% of the Indian population, with higher incidence in females.
  • Diagnosis often relies on biochemical markers like thyrotropin (TSH), triiodothyronine (T3), and thyroxine (T4), which can be challenging due to asymptomatic presentations and vague symptoms.

Purpose of the Study:

  • To address the ongoing controversy surrounding the diagnosis and treatment of subclinical hypothyroidism (SCH) and subclinical hyperthyroidism (SHT).
  • To highlight the complexities in interpreting thyroid function tests (TFTs) due to various interfering factors and methodological variations.

Main Methods:

  • Review of diagnostic criteria for STDs, including interpretation of TSH, FT4, and FT3 levels.
  • Discussion of factors influencing TFT results, such as assay interference, biotin intake, and timing of tests.
  • Analysis of the association between STDs and other health conditions like cardiovascular diseases and metabolic syndrome.

Main Results:

  • TSH levels alone are often insufficient for diagnosing SCH and SHT, necessitating consideration of T3, T4, FT4, and FT3 levels.
  • Assay interference from factors like HAMA, THAAbs, and biotin can lead to spurious TFT results and misdiagnosis.
  • Progression of SCH to overt hypothyroidism is influenced by initial TSH levels, thyroid peroxidase antibodies (TPO), family history, and environmental factors.

Conclusions:

  • Consensus on TSH diagnostic thresholds requires large-scale randomized clinical and epidemiological studies with diverse populations.
  • Avoid immediate treatment for TSH levels between 4-10 mIU/L or 0.1-0.5 mIU/L without confirmatory tests and consideration of other TFTs.
  • Sequential testing from the same laboratory and time, alongside FT3 and FT4 stability, aids accurate diagnosis and treatment decisions in STDs.