FT4

The FT4 (Free Thyroxine) blood test measures the level of unbound or free thyroxine hormone in your blood. Thyroxine, also known as T4, is a hormone produced by the thyroid gland that plays a crucial role in regulating metabolism, growth, and development.

The test is typically performed by taking a blood sample, usually from a vein in your arm, which is then analyzed in a laboratory. FT4 levels are reported in picograms per milliliter (pg/mL) or picomoles per liter (pmol/L).

The FT4 blood test is used to assess thyroid function and diagnose or monitor thyroid disorders such as hypothyroidism or hyperthyroidism. Unlike total T4, which measures both bound and unbound forms of thyroxine, the FT4 test specifically measures the free, unbound portion of the hormone, which is the active form that can affect body functions.

The normal range for FT4 levels may vary slightly depending on the laboratory and the specific testing method used. However, the general normal range for FT4 is approximately 0.7 to 1.9 ng/dL (9 to 24 pmol/L).

It’s important to note that interpretation of the test results should be done in consultation with a healthcare professional. They will consider your symptoms, medical history, and other factors to make an accurate diagnosis and determine the appropriate treatment plan, if necessary.

Treatment for abnormal FT4 levels depends on the underlying thyroid condition. If FT4 levels are too high (hyperthyroidism), treatment may involve medication to regulate thyroid hormone production or other interventions to manage the condition. If FT4 levels are too low (hypothyroidism), treatment may include thyroid hormone replacement therapy.

It’s important to follow your healthcare professional’s guidance regarding FT4 levels and any necessary treatment, as proper thyroid hormone balance is essential for overall health and well-being.