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