A free T3 test, also known as FT3, is a blood test that measures the level of triiodothyronine (T3) hormone that is not bound to proteins in the blood. T3 is a thyroid hormone that plays a crucial role in regulating metabolism, growth, and energy levels in the body.
The free T3 test is often used in conjunction with other thyroid function tests, such as TSH (thyroid-stimulating hormone) and free T4, to help diagnose and monitor thyroid disorders, such as hyperthyroidism and hypothyroidism.
A healthcare provider may order a free T3 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 T3 can indicate an overactive or underactive thyroid gland.
It is important to discuss the results of a free T3 test with a healthcare provider to determine the underlying cause of any abnormalities and develop a treatment plan if necessary.
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