Thyrogen is used as an additional diagnostic tool for detecting blood levels of thyroglobulin with or without radioiodine imaging in the follow-up of patients with certain types of thyroid cancer.

Testing with Thyrogen may be used in the following situations:

1. In patients with an undetectable thyroglobulin on thyroid hormone suppressive therapy, to exclude the diagnosis of residual or recurrent thyroid cancer.
2. In patients requiring blood thyroglobulin testing and radioiodine imaging who are unwilling to undergo thyroid hormone withdrawal testing and whose doctor believes that using a less sensitive test is appropriate.
3. In patients who either do not have a sufficient thyroid stimulating hormone (TSH) blood level in response to thyroid hormone withdrawal or in whom withdrawal is not advised.