Testerone binds to the sex hormone binding globulin and is not bio-available to the prostate cancer cells. Why would you not have a blood test that would give you this information? Why do doctors not test for SHBG along with testosterone, DHT, and PSA?
Foods that can increase SHBG are carrots and gazobobeans among others. I mention them for I enjoy eating them. Different labs have different reference ranges for SHBG. I am 130% over the top of the reference range.