Similarities Between T3 and Free T3 5. Triiodothyronine or T3 is a thyroid hormone released by our thyroid gland. Most of the T3 in our blood exists as a bound form with proteins. Total T3 refers to the collection of both bound and unbound forms of T3. Therefore, when measuring the total T3, it gives the total amount of T3 that circulates in the bloodstream.
Below and above this range reflects an abnormality in secreting thyroid hormone and the functional problem of our thyroid gland. When the total T3 level is high, it is the condition called hyperthyroidism while when it is below, it is the hypothyroidism. Free T3 is the form of T3 that is unbound with proteins.
Compared to total T3 in our bloodstream, Free T3 is in a small percentage. However, measuring free T3 is more accurate than measuring total T3. The normal reference range of free T3 in our bloodstream is 2. Free T3 level represents the immediately available thyroid hormone which can be used. Furthermore, free T3 levels are important for differential diagnosis of hyperthyroidism and non-thyroidal illnesses. This test measures the level of triiodothyronine T3 in your blood.
T3 is one of two major hormones made by your thyroid, a small, butterfly-shaped gland located near the throat. The other hormone is called thyroxine T4. T3 and T4 work together to regulate how your body uses energy. These hormones also play an important role in controlling your weight, body temperature, muscle strength, and nervous system. A test that measures both bound and free T3 is called a total T3 test. Another test called free T3 just measures free T3.
Either test may be used to check T3 levels. If T3 levels are not normal, it can be a sign of thyroid disease. A T3 test is most often used to diagnose hyperthyroidism , a condition in which the body makes too much thyroid hormone. T3 tests are frequently ordered with T4 and TSH thyroid stimulating hormone tests. A T3 test may also be used to monitor treatment for thyroid disease. A health care professional will take a blood sample from a vein in your arm, using a small needle.
After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes. You don't need any special preparations for a T3 blood test. Ask your healthcare provider what your test results mean for you. The normal level of free T3 in the blood is 0. The test is done with a blood sample. A needle is used to draw blood from a vein in your arm or hand.
Having a blood test with a needle carries some risks. These include bleeding, infection, bruising, and feeling lightheaded. When the needle pricks your arm or hand, you may feel a slight sting or pain. Afterward, the site may be sore. Taking thyroid hormone medicines or certain other medicines, such as estrogen or methadone, can affect your test results.
Eating a diet high in iodine-rich foods, such as seaweed, may also affect your test results. You don't need to prepare for this test. But be sure your healthcare provider knows about all the medicines, herbs, vitamins, and supplements you are taking. This includes medicines that don't need a prescription and any illegal drugs you may use. Search Encyclopedia.
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