Lab

T3 Resin Uptake

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T3 Resin Uptake, T3 Binding Ratio, T3RU

  • See Also
  1. Thyroid Function Test
  2. Thyroid Function Summary
  3. Triiodothyronine ( Free T3)
  4. Thyroxine (Free T4)
  5. Thyroid Stimulating Hormone (TSH)
  6. Free Thyroxine Index (Free T4 Index)
  7. Thyroxine Binding Globulin (TBG)
  8. Thyroid Releasing Hormone (TRH)
  9. Antithyroid Antibody
  10. Thyroxine Replacement
  11. Hypothyroidism
  12. Hyperthyroidism
  13. Hypothyroidism in Pregnancy
  14. Thyroid Dysfunction in Pregnancy
  • Indications
  1. Used to calculate Free Thyroxine Index (FTI)
    1. Interpret in conjunction with Total T4 or Total T3
    2. Corrects for abnormal Thyroid Binding Globulin (TBG)
  2. Free T4 also corrects for Thyroid Binding Globulin
    1. Free T4 is preferred over FTI (and T3RU)
  • Measurement
  1. Unbound Thyroid Binding Globulin filled with T3
  2. Remaining unbound Triiodothyronine (T3) is measured
  • Interpretation
  • Increased T3 Resin Uptake
  1. Hyperthyroidism
  2. Systemic illness
  3. Cirrhosis
  4. Nephrotic Syndrome
  5. X-linked decreased Thyroid Binding Globulin
  6. Cushing's Disease
  7. Acromegaly
  8. Diabetic Ketoacidosis (DKA)
  9. Drugs
    1. Prednisone
    2. Androgen
    3. Salicylates
    4. Anabolic Steroids
    5. Asparaginase
  • Interpretation
  • Decreased T3 Resin Uptake
  1. Hypothyroidism
  2. Pregnancy
  3. Hepatitis
  4. Porphyria
  5. X-Linked increased Thyroid Binding Globulin (TBG)
  6. Primary Biliary Cirrhosis
  7. Malnutrition
  8. Drugs
    1. Estrogen
    2. Oral Contraceptives
    3. Perphenazine
    4. Fluorouracil
    5. Clofibrate