The free thyroid profiletest measures the levels of free thyroid hormones, primarily free T3 and free T4, along with thyroid-stimulating hormone (TSH) in the blood. These tests assess thyroid gland function, helping diagnose disorders such as hyperthyroidism or hypothyroidism. By evaluating unbound hormone levels, the test provides a more accurate picture of the thyroid's activity, aiding in the diagnosis and monitoring of thyroid-related conditions and guiding appropriate treatment plans.