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Normal free T3 levels. Providers don’t usually order free T3 tests because they’re not as reliable, but it is possible to test these levels. In general, normal ranges of free T3 for healthy people include: Infants up to 3 days old: 1.4 – 5.4 picograms per milliliter (pg/mL). Infants 4 to 30 days old: 2.0 – 5.2 pg/mL.
A free T3 blood test, also known as a free triiodothyronine (T3) test, measures the amount of triiodothyronine in the blood. This hormone is made by the thyroid gland, which is responsible for many body functions. The blood test will diagnose certain thyroid conditions like hyperthyroidism.
Free T3. This type of T3 is not bound to proteins, and it moves freely around the body. It is less abundant than bound T3 but is the active form of the hormone. Normal T3 levels. Total T3...
Free T3 gives you an idea of how ACTIVE your thyroid is at the cellular level. (1) The measurement of free T3 tells you how much free and active thyroid hormone your body is available to work with. Free T3, after all, is the single most important thyroid hormone in your body.
A Free T4 measures what is not bound and able to enter and affect the body tissues. Tests measuring free T4 – either a free T4 (FT4) or free T4 index (FTI) – more accurately reflect how the thyroid gland is functioning when checked with a TSH.
T3 generally exists in two forms: free and bound T3. Most of the T3 in your blood is attached — or bound — to proteins, and only a small percentage of it is free. A total T3 test measures both...
A free T3 test only measures free T3. Other names: thyroid function test; total triiodothyronine, free triiodothyronine, FT3, TT3, radioimmunoassay FT3. What is it used for? A T3 test is used to help: Diagnose hyperthyroidism, a condition in which your thyroid gland makes too much thyroid hormone.