Endocrinology Book

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T3 Resin UptakeAka: T3 Binding Ratio, T3RU

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  1. 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)
  2. Measurement
    1. Unbound Thyroid Binding Globulin filled with T3
    2. Remaining unbound Triiodothyronine (T3) is measured
  3. 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
  4. 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

T3 uptake measurement (C0202224)

ConceptsLaboratory Procedure (T059)
EnglishT3 - Triiodothyronine uptake, T3 resin uptake, T3 uptake measurement, T3 uptake test, T3RU, T3U measurement, Tri-iodothyronine resin uptake measurement, Triiodothyronine resin uptake
Spanishmedicion de captacion de T3, medicion de la captacion de resina de triyodotironina, medicion de T3U, prueba de captacion de T3, prueba de captacion de triyodotironina
Parent ConceptsChemical procedure (C0201682), Thyroid hormone measurement (C0430083), Duplicate concept (C1274013)
SourcesLNC, MTH, SCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)



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