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Home > All Tests > Thyroxine-binding Globulin Blood Test (TBG)

Thyroxine-binding Globulin Blood Test (TBG)

Total reviews 420

$99.00 $66.00

Total reviews 420


  • Tests Included: 1

  • Est. 9-11 (business days) Turnaround

  • Specimen type: Blood

  • Quest Diagnostics Location

Thyroxine-binding globulin (TBG), a glycoprotein produced in the liver, binds both thyroxine (T4) and triiodothyronine (T3) with high affinity. Because TBG accounts for 76% of plasma protein thyroxine-binding activity, an increase or decrease in its circulating level alters total concentrations of T4 and T3 in blood, leading to potential confusion with true thyroid gland dysfunction. A number of diseases and medications, as well as inherited alterations in TBG gene expression, can change the serum TBG concentration. Measurement of TBG is useful in distinguishing quantitative TBG derangements from thyroid dysfunction. This analyte is elevated with estrogen...

$99.00 $66.00

  • Tests Included: 1

  • Est. 9-11 (business days) Turnaround

  • Specimen type: Blood

  • Quest Diagnostics Location

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Thyroxine-binding globulin (TBG), a glycoprotein produced in the liver, binds both thyroxine (T4) and triiodothyronine (T3) with high affinity. Because TBG accounts for 76% of plasma protein thyroxine-binding activity, an increase or decrease in its circulating level alters total concentrations of T4 and T3 in blood, leading to potential confusion with true thyroid gland dysfunction. A number of diseases and medications, as well as inherited alterations in TBG gene expression, can change the serum TBG concentration. Measurement of TBG is useful in distinguishing quantitative TBG derangements from thyroid dysfunction. This analyte is elevated with estrogen therapy (especially oral contraceptive agents), during pregnancy and or hepatitis. Serum TBG may be decreased in cirrhosis, in the nephritic syndrome and by androgens.

TBG (Thyroxine Binding Globulin)

  • Test Code: 870
  • CPT Code: 84442
  • Alternate Name: Thyroxine Binding Globulin
  • Test Instructions : --

    Please do not exercise prior to testing. It is best that your blood is taken in a rested state.

  • Fasting: No
  • Methodology: Immunoassay (IA)
  • Results In: 9-11

    Note: Turn around times on results are an estimate and are not guaranteed. The lab may need additional time due to holidays, confirmation/repeat testing, etc. You can contact us to discuss when your results should be ready and we will contact the lab on your behalf immediately.

Adult Male 12.7-25.1 mcg/mL
Adult Female 13.5-30.9 mcg/mL
Pediatric    
  4-6 Years 14.8-32.9 mcg/mL
  7-8 Years 16.3-30.7 mcg/mL
  9-10 Years 15.8-27.4 mcg/mL
  11 Years 15.5-27.4 mcg/mL
  12 Years 14.8-26.2 mcg/mL
  13 Years 13.8-25.2 mcg/mL
  14 Years 12.2-25.2 mcg/mL
  15 Years 10.8-23.8 mcg/mL
  16 Years 10.0-23.8 mcg/mL
  17 Years 8.5-23.1 mcg/mL

 

$99.00 $66.00

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