The nurse caring for a patient with a history of diverticulosis who was brought to the emergency department for severe abdominal pain, 10/10 on the numeric pain scale. The nurse observes bright red stools in the bedside commode when entering the patient's room. The patient's initial vital signs are BP 92/40, HR 124, RR 22, Temp 98.7°F (37.1°C), and Sa02 of 95% on room air. The patient's hemoglobin is 4.6 mg/dL (reference range 12-16 mg/dl). The patient has a 20g IV in the left hand. Which of the following orders should the nurse implement first?