A 68-year-old male had bowel surgery 8 hours ago. He has not had any urine from his foley for the past six hrs. He has an IV running at 125 cc/min and his blood pressure is stable. Four hours ago, he received two bolus of NS (total 1000 cc) but did not make any urine. His last Hb was 8.8 and his hematocrit was 29. What is the next step in management?