Diagnosis of thyroid dysfunction typically involves a combination of clinical evaluation and laboratory tests. Blood tests measuring levels of Thyroid-Stimulating Hormone (TSH), Free T4, and Free T3 are the gold standard. Elevated TSH and low Free T4 levels indicate hypothyroidism, while low TSH and elevated Free T4 levels suggest hyperthyroidism. Additional imaging studies, such as a thyroid ultrasound, may be necessary for further evaluation.
