If your healthcare provider has ordered a T4 test, you may wonder what it is. Thyroxine is another name for T4, which is one of the two main types of thyroid hormone the thyroid gland makes. The other ...

Learn more about this stae, what treatments are available, and the prognosis. A T4 tumor (it has spread to tissues next to the prostate meaning it is growing in the rectum, bladder, urethral sphincter ...