Triiodothyronine (T3) is a thyroid hormone bound to carrier proteins that circulates in blood. The free (unbound) portion of triiodothyronine (free T3) is responsible for the biological action and plays an important role in the body’s control of metabolism. Free Triiodothyronine test measures the amount of T3 in the blood.
FT3 is carried out to diagnose hyperthyroidism, to determine thyroid function and to help monitor the progress of a person with a thyroid disorder.
| Reference Range* | Interpretation |
| 1.4 to 4.4 pg/ml | Normal |
*Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.
None needed; however, certain medications can interfere with the free T3 test, so tell your health practitioner about any drugs that you are taking.
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