Thyrotropin alfa is a manmade form of a protein similar to thyroid-stimulating hormone (TSH), which is normally produced by your thyroid. Thyrotropin alfa keeps your TSH levels steady while you undergo thyroid tests or treatments that can reduce TSH and cause symptoms of low thyroid (hypothyroidism). Thyrotropin alfa is used together with radioactive iodine ablation (a procedure to remove thyroid tissue that was not removed with surgery) in people with thyroid cancer. Thyrotropin alfa is also used during medical testing to check for certain types of thyroid cancer that has returned after treatment. Thyrotropin alfa may not help your doctor find all signs of cancer, and there is still a chance that some of your cancer could be missed. Thyrotropin alfa will not treat cancer that has spread to other parts of the body. Thyrotropin alfa may also be used for purposes not listed in this medication guide.
Thyrogen is a recombinant form of human thyroid stimulating hormone (TSH) in the body. It works by making the thyroid cells in the body to absorb radioactive iodine and remove thyroid tissue left over after surgery. This helps to find out if there are any thyroid cancer cells remaining.