How is the condition diagnosed?
The diagnosis of hyperthyroidism is based on both a physical exam and laboratory work. The physical examination will look for the signs and symptoms of hyperthyroidism. Laboratory tests of the blood show higher levels of thyroid hormone and lower levels of thyroid-stimulating hormone (TSH). In some cases, the tests can detect antithyroid antibodies. A nuclear medicine test called a thyroid uptake scan, measures how well the thyroid is functioning. This can help diagnose the specific cause of hyperthyroidism.