Approach to primary immunodeficiencies Quiz: Ace Your Exams
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A 1-year-old boy is admitted for cervical lymphadenitis secondary to Staphylococcus aureus. Past medical history is significant for pneumonia due to Klebsiella pneumoniae, as well as recurrent fevers and multiple skin infections. Family history is non-contributory. Temperature is 37°C (98.6°F), pulse is 100/min, respirations are 25/min, blood pressure is 90/46 mm Hg, and oxygen saturation is 97% on room air. Physical examination reveals bilateral enlarged cervical lymph nodes with associated erythema and tenderness to palpation. Cardiopulmonary and abdominal exams are unremarkable. Which of the following is the most appropriate test to confirm the underlying diagnosis?
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