Can a thyroid function test detect Graves’ disease?

A thyroid function test can help detect Graves’ disease, a common cause of hyperthyroidism. The test will typically show low TSH and high T4 or T3 levels. However, to confirm a diagnosis of Graves’ disease, your doctor may order further tests, including a thyroid-stimulating immunoglobulin (TSI) test or thyroid receptor antibodies (TRAb), which are elevated in Graves’ disease. Radioactive iodine uptake tests can also help confirm the condition and guide treatment options such as anti-thyroid drugs or radioactive iodine therapy.