<prompt> Normal level of PSA in males is:4ngdl4-10 ngml10 ngml4 ngml  <response>: PROSTATE SPECIFIC ANTIGEN PSA -- Causes liquefaction of seminal coagulum. Normal value 4ng ml In 50 years; Value 20ngml diagnostic of CA prostate. PSA is the single test with highest positive reactive value for CA prostate. PSA is prostate specific, not the cancer specific. Level of PSA Is directly related to tumor burden. 