1008. Triiodothyronine total (T3 total)
Description
Triiodothyronine is one of the thyroid hormones that plays a key role in the body's metabolism. The total level reflects the combined amount of protein-bound and free triiodothyronine.
Testing is necessary if you have a low TSH level, especially when free thyroxine levels are normal, and/or if there are symptoms of an overactive thyroid. For an accurate assessment of your condition, it is important to evaluate total T3 together with free T3, T4, and TSH.
When and who needs the test?
- Diagnosis and monitoring of T3 thyrotoxicosis.
- Assessment of thyroid function (manifest or subclinical thyrotoxicosis).
- Differential diagnosis of thyroid disorders.
- Monitoring the effectiveness of thyrotoxicosis treatment, as well as high-dose replacement or suppressive therapy with T4-based medications.
- Detection of pseudo-thyroid dysfunction syndrome in somatic illness (low T3 levels due to impaired conversion of T4 to T3).
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...
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