The patient is scheduled for bariatric surgery in one month. During the preoperative physical, the nurse notes the patient takes St. John's wort. The nurse instructs the patient to stop taking St. John's wort 5 days prior to the surgery for which reason?  

The patient is receiving a transfusion of packed red blood cells. After 30 minutes, the patient complains of intense itching and flank pain. Upon assessment, the nurse notes a fever and tachycardia. Which of the following is the next best step in management?

The 4-year-old patient with a history of sickle cell disease is brought to the emergency room complaining of severe chest pain and cough. Upon assessment, the nurse notes a respiratory rate of 32, a temperature of 39.1°C, and a heart rate of 128 bpm. Which test results does the nurse anticipate? Select all that apply.