T4
Alternate Names : Thyroxine Test
What do the test results mean?
Normal levels of T4 range from 4.5 to 12.5 micrograms per deciliter (mcg/dL).
Abnormally high levels of T4 may be seen with disorders that stimulate the thyroid gland. These include the following:
acute thyroiditis, or inflammation of the thyroid
Graves' disease, a thyroid disorder that causes bodywide symptoms
hyperthyroidism, or an overactive thyroid gland
thyroid cancer
Abnormally low T4 levels may indicate the following:
Hashimoto''s disease, an autoimmune disorder in which the body attacks the thyroid gland
hypothyroidism, or an underactive thyroid
kidney failure
protein malnutrition
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