Thyroxine Binding Globulin




Test Mnemonic

TBG

CPT Codes

  • 84442 - QTY (1)

LOINC ®

3021-3

Aliases

  • TBG

Performing Laboratory

ARUP


Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.5 mLSerumSST (Gold) Frozen 

Minimum Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.4 mL     

Stability

Environmental Condition Description
Ambient24 hours
Refrigerated1 week
Frozen1 month

Days Performed

Mon, Wed, Fri

Turnaround Time

2 - 5 days

Methodology

Name Description
Chemiluminescence Immunoassay (CLIA) 

Reference Range

Thyroxine Binding Globulin
Sex Age From Age To Type Range Range Unit
       Normal13 - 30ug/mL

Special Info

Centrifuge, aliquot and freeze.

Clinical Info

Determine binding capacity for T4; document cases of hereditary deficiency of TBG, in work-up of thyroid disease, particularly in patients with low T4, high T3(uptake) who clinically seem eumetabolic. Such patients may have hereditary anomalies of TBG. They may require no treatment.

Clinical Limitation

n/a

Clinical Reference

n/a