A thyroid-stimulating immunoglobulin (TSI) test is a blood test that can help diagnose Graves’ disease, an autoimmune condition that causes an overactive thyroid. A TSI test measures levels of TSIs in ...

Accurately diagnosing thyroid function is critical to avoid harms of unnecessary treatment. This study found that age-, sex-, and race-specific reference intervals reclassified nearly half of patients ...

Secondary hyperthyroidism occurs when the thyroid gland produces too much thyroid hormone. It can often be caused by a benign tumor of the pituitary gland. The primary treatment option is surgery.