T4 TEST
A T4 test measures the blood level of the hormone T4, also known as thyroxine, which is produced by the thyroid gland and helps control metabolism and growth. The T4 test is performed as part of an evaluation of thyroid function.
Two blood tests may be performed as part of a T4 test:
- total T4, which measures the entire amount of thyroxine in the blood, including the amount attached to blood proteins that help transport the hormone through the bloodstream
- free T4, which measures only the thyroxine that's not attached to proteins (this is the portion of T4 in the blood that's available to affect the functioning of many types of body cells)
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