A Patient Who Is Postoperative Day 1 Following a CABG $20 \mathrm{~mL}$

A patient who is postoperative day 1 following a CABG has produced $20 \mathrm{~mL}$ of urine in the past 3 hours and the nurse has confirmed the patency of the urinary catheter. What is the nurses most appropriate action?

A) Document the patients low urine output and monitor closely for the next several hours.
B) Contact the dietitian and suggest the need for increased oral fluid intake.
C) Contact the patients physician and suggest assessment of fluid balance and renal function.
D) Increase the infusion rate of the patients IV fluid to prompt an increase in renal function.