A 58-year-old male is admitted with a history of kidney stones. Over the past three hours, the nurse monitors the following: Parameter 7:30 9:00 1:15 Temperature 99.4 99.6F 100.1°F Heart Rate 60 68 70 Right Flank Pain 4/10 6/10 9/10 Urinary output 94ml 95 ml 75 ml Based on this trend, which finding requires the nurse's immediate attention?

A. Temperature: The patient’s temperature has only slightly increased from 99.4°F to 100.1°F, which is a mild elevation and does not indicate immediate life-threatening infection or sepsis. It should continue to be monitored but is not the most urgent finding. B. Right-sided flank pain: The patient’s flank pain is increasing from 4/10 to 9/10, indicating worsening discomfort. While significant for patient comfort and possible obstruction, pain alone is not immediately life-threatening compared with changes in renal output. C. Heart rate: The patient’s heart rate has gradually increased from 60 to 70 bpm, which remains within normal limits for adults. This trend does not indicate acute cardiovascular compromise at this time. D. Urinary output: Urinary output has decreased from 94–95 mL to 75 mL over three hours, suggesting impaired renal function or potential obstruction from kidney stones. Oliguria or decreasing urine output can indicate acute kidney injury, which is a priority concern requiring immediate assessment and intervention to prevent serious complications.