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Interferences With Thyroid Function Immunoassays: Clinical Implications and Detection Algorithm.

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Area of Science:

  • Clinical Chemistry
  • Endocrinology
  • Laboratory Medicine

Background:

  • Automated immunoassays for thyroid function testing are susceptible to various interferences.
  • These interferences can significantly impact clinical decisions regarding thyroid disorders.
  • Commonly measured analytes include thyroid stimulating hormone (TSH), free thyroxine (T4), and free triiodothyronine (T3).

Purpose of the Study:

  • To provide a comprehensive review of six major interference types affecting thyroid function tests.
  • To propose a detection algorithm for identifying these interferences in clinical practice.
  • To evaluate the clinical impact of thyroid interference on immunoassay results and patient management.

Main Methods:

  • Review of existing literature on thyroid function test interferences.
  • Identification of six key interference types: macro-TSH, biotin, antistreptavidin antibodies, anti-ruthenium antibodies, thyroid hormone autoantibodies, and heterophilic antibodies.
  • Development of a screening algorithm based on observed patterns of thyroid function test alterations.

Main Results:

  • Over 50% of documented thyroid interferences in a review of >150 patients led to misdiagnosis or inappropriate management.
  • Interferences can result in unnecessary treatments, altered ongoing therapies, or superfluous diagnostic tests.
  • Prevalence of some interferences can approach 1%, highlighting the potential scale of the problem.

Conclusions:

  • Interference in thyroid function testing is a significant clinical issue with substantial impact on patient care.
  • A high index of suspicion for interference is warranted when clinical and biochemical findings are discordant.
  • Collaboration between clinicians and laboratories is crucial for accurate diagnosis and appropriate management of thyroid disorders.