Thyroid Function Tests are commonly ordered when symptoms of thyroid disorders are present, such as fatigue, weight changes, hair loss, or palpitations. They are also used to monitor treatment in individuals already diagnosed with thyroid conditions. Accurate interpretation of TFT results requires consideration of the patient s clinical history and other factors by a healthcare provider. ’ 1. Thyroid-Stimulating Hormone (TSH): This hormone, produced by the pituitary gland, regulates thyroid activity. Elevated TSH levels may indicate hypothyroidism (underactive thyroid), while low levels suggest hyperthyroidism (overactive thyroid). 2. Free Thyroxine (Free T4): T4 is one of the main hormones produced by the thyroid gland. Measuring free (unbound) T4 provides insight into the gland's ability to produce hormones. Abnormal levels can signal thyroid dysfunction. 3. Free Triiodothyronine (Free T3): T3 is another thyroid hormone, more active than T4. Testing free T3 levels is especially useful in assessing hyperthyroidism or when symptoms persist despite normal T4 levels. 4. Thyroid Antibodies: Tests for thyroid peroxidase antibodies (TPOAb) and thyroglobulin antibodies (TgAb) are used to diagnose autoimmune thyroid conditions, such as Hashimoto s thyroiditis or Graves disease. ’ ’ In some cases, additional tests, like reverse T3 or imaging studies, may be recommended to further assess thyroid health.