A free T4 test, also known as FT4, is a blood test that measures the level of thyroxine (T4) hormone that is not bound to proteins in the blood. T4 is a thyroid hormone that helps regulate metabolism, growth, and energy levels in the body.
The free T4 test is often used in conjunction with other thyroid function tests, such as TSH (thyroid-stimulating hormone) and free T3, to help diagnose and monitor thyroid disorders, such as hyperthyroidism and hypothyroidism.
A healthcare provider may order a free T4 test if a person is experiencing symptoms of thyroid dysfunction, such as fatigue, weight changes, hair loss, or changes in heart rate. Abnormal levels of free T4 can indicate an overactive or underactive thyroid gland.
It is important to discuss the results of a free T4 test with a healthcare provider to determine the underlying cause of any abnormalities and develop a treatment plan if necessary.
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