The majority of radical treatment decisions are made on the basis and results of PSA testing. PSA or Prostate-Specific Antigen, is a protein produced by cells of the prostate gland. The PSA test measures the level of PSA in the blood. Due to the dangers of overtreatment some experts have proposed forgoing PSAtesting altogether. However, this attitude is like throwing the baby out with the bathwater, since early diagnosis and treatment of high-grade prostate cancer unquestionably improves survival and quality of life.