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HelpTest Code TBGLB / 500724-EX THYROXINE-BINDING GLOBULIN (TBGLB), SERUM
Additional Codes
| Software | Test Code |
|---|---|
| Label Text | TBGLB |
| EPIC | LAB128 |
| LabCorp | 500724 |
Performing Laboratory
Esoterix Laboratory Services (LabCorp Specialty Testing Group)
Useful For
Assessing cases in which total thyroid hormone levels do not correlate with the thyrometabolic status, most commonly in pregnancy or with the use of contraceptive steroids
Method Name
Immunochemiluminometric Assay (ICMA)
Reference Values
CHILDREN: 12.7-27.9 ug/ml
ADULTS: 13-39 ug/ml
Days and Times Test Performed
Monday through Friday
Report Available
1-3 Days
Specimen Type
Submit one of the following:
~ Plasma
~ Serum
Preferred Container
Serum Separator Tube (SST)
Preferred Volume
Plasma: 1 mL (Lavender Top Tube (EDTA)) – 0.3 mL does not allow for repeat testing
Serum: 1 mL (Serum Separator Tube (SST)) – 0.3 mL does not allow for repeat testing
Minimum Volume
Plasma: 0.3 mL (Lavender Top Tube (EDTA))
Serum: 0.3 mL (Serum Separator Tube (SST))
Specimen Collection and Handling
Spin specimen, separate from clot and send frozen within one hour of draw.
Add On Capable
Contact Reference Lab – If add-on can never be done, report the test to the Administrative Analyst
Advance Beneficiary Notice Requirements
No ABN Required
CPT Code Information
|
CPT Code |
CPT Description |
CPT Disclaimer |
|---|---|---|
| 84442 | Thyroxine Binding Globulin (TBG), Quantitative |
Keywords
NON-PROTEIN BOUND TETRAIODOTHYRONINE
TBG (THYROXINE-BINDING GLOBULIN)
THYROID-BINDING GLOBULIN
THYROXINE ANTIBODIES
Performing Laboratory Location
Esoterix Laboratory Services (LabCorp Specialty Testing Group)
Clinical Significance
In TBG deficiency one may find euthyroid patients with extremely low total T4 values. Conversely, patients with high TBG levels may be clinically euthyroid with high serum total T4 values.
LOINC Code Information
3021-3
Acceptable Alternative Container(s)
Lavender Top Tube (EDTA)
Red Top Tube