Final answer:
The priority finding for a patient after IVU is decreased urine output as it may indicate kidney damage or obstruction.
Step-by-step explanation:
The priority finding for a patient following intravenous urography (IVU) would be decreased urine output (Choice C). IVU involves injecting a contrast dye into the veins to visualize the urinary system. Decreased urine output may indicate possible kidney damage or obstruction, which requires immediate attention. Swollen lips (Choice A) may suggest an allergic reaction, pain at IV catheter insertion site (Choice B) is a common discomfort after the procedure, and pink-tinged urine (Choice D) is expected due to the dye.