58 year-old man present with complain of urinary frequency, hesitancy, or dysuria. A digital rectal examination confirms the presence of a firm, hard, asymmetrical and stony prostate. . As next investigation, PSA levels test was done. All are true about PSA except?
Upper-age-specific PSA value for this patient is 6.5 ng/ml PSA density : serum PSA / volume It is senstive but not specific test Product of prostatic epithelium