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They say they have a urine test for brain tumors that is 100% sensitive and 97% specific. That means they can 100% of the time tell when you have a brain tumor, and 97% of the time tell when you do not have a brain tumor - so about 3% false positives - which is very good for such a test. This can be used as a screening test during your annual physical exam. Unfortunately we really do not yet know if early detection will make much of a difference with Glioblastomas.