1007. Triiodothyronine free (T3 free)
Description
Free triiodothyronine is the portion of T3 that is not bound to blood proteins. This free form is biologically active and directly regulates metabolism by acting on receptors in various organs and tissues.
Testing is recommended if your TSH level is low, especially when free T4 remains within the normal range, and/or if you are experiencing symptoms of increased thyroid activity (hyperthyroidism). For a complete picture, it is best to test TSH and free T4 alongside free T3.
When and who needs the test?
- Diagnosis and monitoring of T3 thyrotoxicosis, which may occur in approximately 10% of hyperthyroidism cases.
- Detection of disease recurrence in patients with Graves’ disease (an increase in free T3 may be an early sign).
- Detection of pseudodysfunction of the thyroid gland in the presence of non-thyroidal conditions.
Biological material
- Venous blood
Preparing for a blood test
In order to exclude factors that may affect the test results, we recommend to follow the preparation rules:
- an important condition for laboratory tests is to take blood on an empty stomach.
- 6-12 hours before the test, you should avoid eating, drinking alcohol, smoking, and limit physical activity. Drinking...
Cheaper in a package