Marc Greenstein, D.O.Health ProfessionalMarc Greenstein is a practicing urologist in New Jersey. He wrote for HealthCentral as a health professional for Prostate. Latest Articles by Marc Greenstein, D.O.Prostate HealthPSA Velocity: What Does a Quick Rise in PSA Mean?Dear Dr. Greenstein:** My friend ,who is in his early 50s, just got the results of his annual PSA test - it was between 4-5. The results of his previous 6 annual tests were in the 1-2 range every year, until now. His brother recently had his prostate ...