Formal Name of the Test:
T4 (Thyroxine), Total
Other Names Used:
T4 Total; Tetraiodothyronine
The amount of thyroxine, or T4, in the blood is measured by this test. The thyroid gland produces two primary hormones: T4 and T3. The total T4 test is performed to determine whether someone has hyperthyroidism or hypothyroidism. It’s a valuable test, but the amount of protein in the blood that may bind to the hormone can influence the results.
There is no need for any prior preparation. Stop biotin consumption at least 72 hours prior to the collection.
Test Performed at:
Quest Diagnostics, Test Code 867
Click here to go to Quest Diagnostics page for this test