Thyroxine (T<sub>4</sub>), Thyroxine-Binding Globulin (TBG), and T<sub>4</sub> - TBG Index
| Thyroxine (T4), Thyroxine-Binding Globulin (TBG), and T4 - TBG Index | | | |
| Number | | 004457 |
| CPT | | 84436; 84442 |
| Synonyms | | TBG, Thyroxine (T4), and T4 - TBG Index |
| Specimen | | Serum |
| Volume | | 2 mL |
| Minimum Volume | | 0.5 mL (Note: This volume does not allow for repeat testing.) |
| Container | | Red-top tube or gel-barrier tube |
| Collection | | If a red-top tube is used, transfer separated serum to a plastic transport tube. |
| Storage Instructions | | Refrigerate |
| Causes for Rejection | | Plasma specimen |
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