Is PSA reliable in a patient who has a foley catheter or has undergone recent DRE?

PSA is usually not reliable in a patient who has a Foley catheter and is transiently unreliable for 24-48 hours in a patient who has undergone a recent DRE. The reason is inflammation or infection from a Foley catheter, the underlying condition requiring a Foley catheter, or the physical trauma from...