Thyroid nodules are lumps that can develop on the thyroid gland. They may be solid and look dark on an ultrasound scan. Most are benign, but there is a low risk of thyroid cancer. The thyroid is a ...
Thyroid level tests, including thyroid-stimulating hormone (TSH) and free T4, help diagnose underactive or overactive thyroid. Doctors may also check free T3, calcitonin, thyroglobulin, or thyroid ...