Final answer:
The appropriate intervention for Mr. Jones, who has an abnormally low urine output compared to his fluid intake, is to document the findings and monitor for potential underlying issues such as oliguria or renal disease, while reassessing fluid status and renal function.
Step-by-step explanation:
If Mr. Jones's total urinary output is 50 mL and his total intravenous (IV) fluid intake since admission is 1550 mL, one appropriate nursing intervention at this time would be to document findings and monitor the patient closely. The expected urine output for a healthy adult is at least 500 mL/day to get rid of body wastes efficiently. Since Mr. Jones's output is substantially below this level, it suggests oliguria, which could be due to severe dehydration or renal disease. However, without further information such as vital signs, physical examination results, and laboratory findings, it would be inappropriate to increase IV fluids, which may exacerbate the problem, or to administer diuretics, which could worsen dehydration if present. Close monitoring including reassessment of fluid status and renal function tests are critical in guiding further interventions. Thus, documenting the findings is essential while also considering the patient's complete clinical picture.