Thyroid Function Tests (TFTs) - Interpretation

Don't forget to register to be able to save your lab tests.

Component Value
Thyroid Stimulating Hormone (TSH)
Free T4 (thyroxine) (FT4)
Free T3 (triiodothyronine) (FT3)
[Coming soon]

Help us to provide better content for you. Please write what you would like to improve on our website (new tests, services, etc.):

I agree: All information on this website is for informational purposes only and is not intended as a substitute for medical or other professional healthcare advice and treatment. Go to Medical disclaimer

The thyroid gland makes two major hormones, which are secreted into the bloodstream. These thyroid hormones are thyroxin (T4) and triiodothyronine (T3). T4 contains four iodine atoms. T4 is converted to triiodothyronine (T3), which contains three iodine atoms. The amount of T4 and T3 secreted by the thyroid gland is regulated by the pituitary gland. The pituitary gland determines the level of thyroid hormones in the blood and secretes thyroid stimulating hormone (TSH), which regulates the amount of T4 and T3 in the body.

Thyroid function tests (TFTs) or thyroid panel usually includes thyroid stimulating hormone (TSH), thyroxine (T4) and triiodothyronine (T3). Also, a "free" portion of T4 and T3 can be measured (free T4 (FT4) and free T3 (FT3)).

The normal range for TSH (or TSH reference values) is usually 0.4-4.0 mU/L (milliunits per liter). TSH levels in children are higher than in adults. The normal range for TSH during pregnancy is slightly shifted downward.

MG Game