Free triiodothyronine, or FT3, short for free T3, is one of the relatively sensitive indicators for the diagnosis of hyperthyroidism in clinical practice, and is used to assess the severity of hyperthyroidism and hypothyroidism as well as the effectiveness of treatment. The general reference value is 6.0~11.4 pmol/L. The reference value of FT3 may vary slightly in different experimental methods and different regions.
Triiodothyronine (T3) is produced by the deiodination of serum thyroxine (T4) in the kidney and liver, and the T3 that binds to thyroid-binding globulin is called bound T3, while the unbound T3 is called free T3 (FT3), and FT3 can be used to diagnose hyperthyroidism, low T3 syndrome, and so on.
The reference value of FT3 may be slightly different in different experimental methods and in different regions, and the units may also vary. Patients are advised to compare the normal value range of their local hospitals to make judgment, and if there is any abnormality, they should consult with their specialists in time, and follow the doctor’s instructions for further examination and treatment.