Final answer:
Foul-smelling urine is a finding that indicates that an indwelling urinary catheter requires irrigation.
Step-by-step explanation:
One of the findings that indicates that an indwelling urinary catheter requires irrigation is foul-smelling urine. When the urine has a strong, unpleasant odor, it suggests the presence of infection or bacterial growth in the urinary tract. Irrigating the catheter can help to flush out any bacteria or debris that may be causing the foul smell.