Thyroxine - Free (FT4)

Understanding Thyroxine - Free (FT4)

Thyroxine or T4 is a thyroid hormone that regulates your body’s metabolism, temperature, blood pressure, heart rate, etc. It is produced along with the T3 hormone and plays an important role in the growth and development of the nervous system and the brain. T4 hormone exists in the blood in two forms: bound (attached to proteins) and free (not attached to proteins). Deranged levels of this hormone can result in either hyperthyroidism (the thyroid gland produces too much T4) or hypothyroidism (the thyroid glan...

What does Thyroxine - Free (FT4) measure?

The Thyroxine - Free (FT4) test measures the amount of free form of thyroxine hormone in the blood. This test helps evaluate the functioning of the thyroid gland and detect possible thyroid disorders. It is also performed in combination with free T3 and TSH tests as part of a thyroid profile free test.