FrT3 (FREE TRIIODOTHYRONINE)
Types
- Whenever the thyroid function tests i.e., T3, T4, TSH fails to give a diagnostic conclusion, a combination of FT4 and FT3 is checked. Free T3 concentration, which represents about 0.3% of the total circulating hormone concentration, is maintained independently of changes of binding protein levels
- Determination of free T3 concentrati...
Description
- 1.7 -4.20 pg/ml
When to get Tested
- When there is s/s of Hyperthyroidism (Increased heart rate, Anxiety, weight loss, difficulty sleeping, tremors in the hands, weakness, and menstrual irregularity)
Elevated Level
- T3 Thyrotoxicosis when FrT4 and TSH levels are within normal limits
- Hyperthyroidism
- Patients inadequately treated with ATD
Decreased Level
- Hypothyroidism
- Inadequately treated hypothyroidism
- Euthyroid sick syndrome
- Low T3 syndrome
