Mycoplasma pneumoniae Quiz: Ace Your Exams

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A 24-year-old man comes to the clinic because of a 2-week history of nonproductive cough and intermittent headaches. The patient has been feeling severely fatigued for the past few weeks, even though his daily regimen has remained the same. He is currently training to become an artillery officer and lives in army barracks. Past medical history is noncontributory, and he takes a multivitamin daily. He does not use tobacco, alcohol, or illicit substances. Temperature is 38.2°C (100.8°F), pulse is 96/min, and blood pressure is 128/85 mmHg. Physical examination reveals conjunctival pallor and pale mucous membranes. Bilateral crackles are heard on chest auscultation. Chest radiograph reveals diffuse bilateral infiltrates. Laboratory results are as follows:

 
Laboratory value  Result 
Complete blood count 
Hemoglobin   9.6 g/dL 
 Hematocrit  30% 
 Leukocyte count  9,100/mm3 
 Platelet count  250,000/mm3 
 MCV  88 µm3 
 Haptoglobin  23 mg/dL (N= 41-165 mg/dL) 

 Further testing in this patient is likely to reveal which of the following findings?  

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