Q. A 53-year-old man has come to the emergency room with dyspnea, headache, dizziness, and somnolence for the past two days. He was diagnosed with acute myeloid leukemia two years ago and has been under treatment with several relapses. The last chemotherapy course was two months ago. He has no fever. His respiratory rate is 21/min. On physical examination, he has mucosal pallor with no scleral icterus. Lung auscultation reveals scattered fine crackles in both lungs. The oxygen saturation is 92% on pulse oximetry. The emergency lab tests show a white blood cell count of 104,500 cells/microL, hematocrit of 37%, hemoglobin of 8.7 g/dL, platelet count of 56,000/microL, and more than 20% of myeloblasts in the peripheral blood. The chest x-ray shows reticular haziness in both lungs. What is the best plan for him?