system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 6-year-old boy is brought to the emergency department with a mild fever for the past week. He has also had generalized weakness and fatigue for the past month. He has been complaining of diffuse pain in his legs and arms. He has a history of Down syndrome with surgical repair of a congenital atrial septal defect as an infant. His temperature is 38.0° C (100.4° F), pulse is 85/min, respirations are 16/min, and blood pressure is 90/60 mm Hg. He has enlarged cervical lymph nodes bilaterally that are nontender to palpation. He is uncooperative for the rest of the examination. Laboratory studies show:
Hemoglobin 10.2 g/dL
Hematocrit 30.0%
Leukocyte count 50,000/mm3
Platelet count 20,000/mm3
Serum
Sodium 136 mEq/L
Potassium 4.7 mEq/L
Chloride 102 mEq/L
Bicarbonate 25 mEq/L
Urea nitrogen 18 mg/dL
Creatinine 1.1 mg/dL
Total bilirubin 0.9 mg/dL
AST 30 U/L
ALT 46 U/L
Which of the following is most likely to confirm the diagnosis?"
assistant
Bone marrow biopsy