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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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