Reflex PCA3 Messenger Ribonucleic Acid Testing: Validation of Postbiopsy Urine Samples and Correlation With Prostate Biopsy Findings in ∼2000 Patients

Post-TRUS bx urine is a valid sample for PCA3 testing. Patients with a negative bx and a positive PCA3 test may have a higher likelihood of unsampled CaP.