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Effects of illness on thyroid function tests.

J V Felicetta1

  • 1Department of Medicine, Veterans Administration Medical Center, Phoenix.

Postgraduate Medicine
|June 1, 1989
PubMed
Summary
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Severe illness causes abnormal thyroid function tests, but patients remain euthyroid. Recognizing this "euthyroid sick syndrome" is crucial to prevent unnecessary thyroid hormone treatment.

Area of Science:

  • Endocrinology
  • Internal Medicine
  • Thyroidology

Background:

  • Severe illness frequently alters thyroid function tests.
  • Thyroid function tests show predictable changes during critical illness.

Purpose of the Study:

  • To describe the characteristic changes in thyroid function tests during severe illness.
  • To emphasize the importance of recognizing the euthyroid sick syndrome.

Main Methods:

  • Observational analysis of thyroid function test patterns in severe illness.
  • Review of existing literature on thyroid function in non-thyroidal illness.

Main Results:

  • Decreased total triiodothyronine (T3) and increased reverse T3 are early findings.

Related Experiment Videos

  • Further progression shows decreased thyroxine and increased T3 resin uptake.
  • Thyrotropin levels remain normal, indicating euthyroid status despite test abnormalities.

    • Conclusions:

    • Patients with severe illness exhibit altered thyroid function tests but are euthyroid.
    • Supplemental thyroid hormone is not beneficial and potentially harmful in euthyroid sick syndrome.
    • Accurate diagnosis of the euthyroid sick syndrome prevents unnecessary and potentially harmful interventions.