Approximately 1 hour prior to arrival at the ED, a 29-yearold has given birth to a normal, healthy girl. Since arriving in the ED, the patient has completely saturated five perineal pads. Her blood pressure is 100/70 mmHg, pulse rate 82 beats/minute and regular; and respiratory rate, 18 breaths/minute. She has no sign of syncope or light-headedness and has not lost consciousness. Blood specimens are sent to the laboratory for a complete blood count (CBC) with differential, electrolyte levels, and type and cross match. Two units of packed red blood cells are available, if necessary. The nurse palpates the fundus and determines that it is soft. Which nursing intervention would be most appropriate at this time?