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Thyroid Function Summary

Hyperthyroidism
1. Increased
  1. Thyroxine (T4) and Triiodothyronine (T3)
  2. Free T4 (fT4) and Free T3 (fT3)
  3. T3 Resin Uptake (T3RU) and Free Thyroxine Index (FTI)
  4. Reverse T3 (rT3)
2. Decreased
  1. Thyroid Stimulating Hormone (TSH)
  2. Thyroid Releasing Hormone (TRH)
Hypothyroidism
1. Increased
  1. Thyroid Stimulating Hormone (TSH)
  2. Thyroid Releasing Hormone (TRH)
2. Decreased
  1. Thyroxine (T4) and Triiodothyronine (T3)
  2. Free T4 (fT4) and Free T3 (fT3)
  3. T3 Resin Uptake (T3RU) and Free Thyroxine Index (FTI)
  4. Reverse T3 (rT3)
References
1. Costa (1995) Am Fam Physician 52(8):2325
2. Pittman (1996) Am Fam Physician 54(3):961

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This page was written by Scott Moses, MD. This page was last revised before 5/10/08, prior to consistent tracking of revision date. This page was last published on 5/16/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 6.0.