How is a thyroid nodule diagnosed?
Most nodules are discovered during an examination of the neck for another reason. Blood tests of thyroid hormone (thyroxine, or T4) and thyroid-stimulating hormone (TSH) are usually normal. Specialized tests are necessary to determine whether a thyroid nodule is cancerous. You may be asked to undergo a thyroid fine needle biopsy, a thyroid scan, and/or a thyroid ultrasound.