KLK3 and Familial prostate cancer: However, the probabilities of low to medium levels of PSA in a blood test for detecting the cancer were rather low (44–45%) when compared to FTIR analysis of urinary EVs which have 63–70% chance of diagnosing prostate cancer in the individuals detected with PSA in the low range of 4 ng/mL up to 10 or 20 ng/mL.