Thyroxine Binding Globulin
Test Mnemonic
TBG
CPT Codes
- 84442 - QTY (1)
LOINC ®
3021-3
Aliases
- TBG
Performing Laboratory
ARUP
FDA Category
In Vitro Diagnostic
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.5 mL | Serum | SST (Gold) | Frozen |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.4 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | 24 hours |
| Refrigerated | 1 week |
| Frozen | 1 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 |
| Normal | 13 - 30 | ug/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.