Search results
Results From The WOW.Com Content Network
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.
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.
This article will discuss normal and abnormal free T3 levels. It will also cover what to expect when receiving a free T3 test.
Free T3 Thyroid Test Result. If your Free T3 level is high in your thyroid test results, it indicates that your thyroid is overactive or hyperthyroidism. If your Free T3 is low in your thyroid test results, you may not be converting T4 to Free T3 very well.
For total T3, the normal range in adults is about 71 – 180 ng/dL . For free T3, the normal range in adults is about 2.0 – 4.4 pg/mL [ 8 ]. Normal T3 levels don’t necessarily mean there are no issues with the thyroid.
In some individuals with a low TSH, only the T3 is elevated and the FT4 or FTI is normal. T3 testing rarely is helpful in the hypothyroid patient, since it is the last test to become abnormal. Patients can be severely hypothyroid with a high TSH and low FT4 or FTI, but have a normal T3. FREE T3
Triiodothyronine (T3) is the active thyroid hormone converted from T4. As with T4, there is both bound and free T3. T3 blood tests include: Total T3: The total amount of T3 (bound and unbound) in your bloodstream. Free T3: The amount of unbound T3 available for use in tissues.
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.
The T3 uptake test, also called T3 resin uptake (T3RU), measures the amount of protein in the blood that carries thyroid hormone. If T3 needs to be tested, the FT3 test is usually the go-to. The normal range of free T3 levels is between 3.1 and 6.8 pmol/L. 5 6 7
The free T-3 test measures only the amount of free T3. The total T3 test measures both free and bound T3 in your blood. Why do I need this test? You may need this test if you have symptoms of hyperthyroidism. Symptoms include: Anxiety and mood swings. Irritability. Weakness in the arms and legs. Sleeping problems. Hand tremors. Sweating.