Thyroxine Binding Globulin


Sunquest Code:TBG  
Epic Code:LAB128Epic Name:THYROXINE BINDING GLOBULIN
Synonyms:T4 Binding Capacity
Methodology:Chemiluminescent immunoassay
CPT Code:84442
Turnaround Time:Specimens are sent to reference laboratory Mon-Sat; results are reported within 1-4 days. Testing performed on Mon., Wed, and Fri.


Collection Instructions

Specimen:Blood
Optimal Volume:1 mL
Minimum\Peds Volume:1 mL
Container:Red or gold (gel) (Red (no gel))
Causes for Rejection:Plasma, grossly hemolyzed or lipemic specimens.


Processing and Shipping

Specimen Processing:Centrifuge and aliquot 0.5 mL, 0.4 mL minimum. Store in freezer.
Shipping Instructions:Ship on dry ice.
Test Performed at or Referral Lab Lab Sendouts  (ARUP)
Referral Lab number:70410 (TBG)


Interpretive

Reference Range:13.0-30 ug/mL
Use:Determination of thyroxine binding globulin (TBG) levels is particularly useful for cases in which total thyroid hormone levels do not correlate with the thyrometabolic status, such as with pregnancy, the use of contraceptive steroids, or in patients with hereditary excesses or deficiencies of TBG.


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