
Thyroxine (T4) Quantification Test
The T4 test quantitatively measures thyroxine (T4) levels in the blood to assess thyroid function.
T4 is the main hormone secreted by the thyroid gland and plays a key role in regulating metabolism. It is converted into the biologically active hormone triiodothyronine (T3) in peripheral tissues.
| Specimen | Serum, Plasma |
|---|---|
| Test time | 10 min |
| Specimen volume | 7 μL |
| Measurable range | 0.5-20 μg/dL |
| Storage temperature | 2-8°C |
