Products Category : Healthcare / Biochemistry
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Brand name : Healthy laboratory
What It Is. 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.
In general, T4 results that are higher than normal may be a sign of: Hyperthyroidism, which may be caused by Graves disease or another medical condition that causes your thyroid to make too much T4. Thyroiditis (thyroid inflammation) Toxic goiter (an enlarged thyroid with areas that make extra thyroid hormone)