Thyroxine, Total
| Alternate Names | T4; Total T4 |
| Ordering Recommendation | Used in the diagnosis and treatment of thyroid disease. Primary malfunction of the thyroid gland may result in excessive or below normal release of T4 or T3. Disease in any portion of the thyroid-pituitary-hypothalamus system may influence the levels of T4 and T3 in the blood. |
| Specimen | Lithium Heparin Plasma |
| Container Type | Green Top Tube
|
| Methodology | Chemiluminescence |
| Reference Range | 1-23 months: 6.0-13.2 ug/dL 2-12 years: 5.5-12.1 ug/dL 13-20 years: 5.5-11.1 ug/dL >20 years: 4.5-10.9 ug/dL |
| Stability | 7 days |
| Transport Temp | Refrigerate 2°-8°C |
| Days Performed | Daily |
| Report Available | 1 day |
| NY State Available | Yes |
| LOINC Code | 3026-2 |
| CPT Code | 84436 |
