The Free T4 test measures the level of unbound (active) thyroxine (T4) in the blood. T4 is a primary hormone produced by the thyroid gland and serves as a precursor to the active hormone T3. Measuring the free portion provides an accurate reflection of thyroid hormone available for use by the body.
This test is commonly used to evaluate thyroid function and investigate symptoms such as fatigue, weight changes, temperature sensitivity, or heart rate abnormalities. Free T4 results are typically interpreted alongside TSH and Free T3 to provide a comprehensive assessment of thyroid health.
T4, Free
The Free T4 test measures the level of unbound (active) thyroxine (T4) in the blood. T4 is a primary hormone produced by the thyroid gland and serves as a precursor to the active hormone T3. Measuring the free portion provides an accurate reflection of thyroid hormone available for use by the body.
This test is commonly used to evaluate thyroid function and investigate symptoms such as fatigue, weight changes, temperature sensitivity, or heart rate abnormalities. Free T4 results are typically interpreted alongside TSH and Free T3 to provide a comprehensive assessment of thyroid health.
