T3 (Triiodothyronine) Test: What It Is, Function Levels Triiodothyronine, also known as T3, is one of the two main thyroid hormones Thyroxine, or T4, is the other hormone Healthcare providers test T3 levels using blood tests Triiodothyronine comes in two forms: Free T3: This form enters your body’s tissues where it's needed
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T3 levels: What is normal and what the test results mean Normal T3 levels indicate that someone’s thyroid is producing an adequate amount of T3 hormone High levels can indicate hyperthyroidism, and low levels can be a sign of hypothyroidism
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Triiodothyronine (T3) Tests: MedlinePlus Medical Test What is a triiodothyronine (T3) test? A triiodothyronine (T3) test measures the level of T3 in a sample of your blood It's used to help diagnose thyroid disease Your thyroid is a small, butterfly-shaped gland at the base of your throat It makes two hormones, T3 and T4 (thyroxine)
Understanding Your Thyroid Test Results: TSH, T4, T3, and More T3 is the active thyroid hormone that directly influences metabolic processes within cells Only about 10% of the thyroid hormone produced by the thyroid gland is T; most T3 in the body comes from converting T4 into T3 in peripheral tissues such as the liver and kidneys