Thyroxine (T<sub>4</sub>) and Thyroid-Stimulating Hormone (TSH)
| Thyroxine (T4) and Thyroid-Stimulating Hormone (TSH) | | | |
| Number | | 024026 |
| CPT | | 84436; 84443 |
| Synonyms | | T4 and TSH ; TSH and T4 |
| Test Includes | | Thyroxine (T4); thyroid-stimulating hormone (TSH) |
| Specimen | | Serum |
| Volume | | 1 mL |
| Minimum Volume | | 0.6 mL (Note: This volume does not allow for repeat testing.) |
| Container | | Red-top tube or gel-barrier tube |
| Collection | | If gel-barrier tube is used, transfer separated serum to a plastic transport tube. |
| Storage Instructions | | Refrigerate |
| Causes for Rejection | | Plasma specimen |
|