Approach to primary immunodeficiencies Quiz: Ace Your Exams
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A 5-year-old boy presents to clinic with a parent for evaluation of persistent eczema. Medical history is significant for frequent respiratory tract infections. Birth and family histories are non-contributory. Temperature is 37°C (98.6°F), pulse is 100/min, respirations are 22/min, blood pressure is 96/58 mm Hg, and oxygen saturation is 98% on room air. Physical examination reveals eczematous lesions over the elbows and knees with associated excoriation. No dysmorphic features are noted. Cardiopulmonary and abdominal examinations are normal. Laboratory studies are shown below. Which of the following is the most likely diagnosis?
| Laboratory value | Result |
| Serum chemistries | |
| Hemoglobin | 12 g/dL |
| Hematocrit | 40 % |
| Leukocyte count | 9,100 /mm3 |
| Platelet count | 80,000/mm3 |
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