Final answer:
Post-ESWL, a nurse should expect to find hematuria due to minor damage to the urinary tract lining, a common outcome of the procedure.
Step-by-step explanation:
A nurse assessing a client who had extracorporeal shock wave lithotripsy (ESWL) 6 hours ago should expect the following finding: hematuria. ESWL is a medical procedure that uses high-intensity ultrasound waves to break apart kidney stones, so small fragments can pass through the urinary tract. While the process does not immediately increase urine output or ensure the passage of large stone fragments, it typically results in decreased pain. However, due to the minor damage caused to the urinary tract lining during the stone fragmentation, hematuria, or blood in the urine, is a common finding post-procedure.