COPD USMLE Step 1 Practice Question
A 20-year-old college student presents with a 6-day history of low-grade fever (38.2°C), headache, malaise, and persistent dry cough. Vital signs show HR 102/min, RR 24/min, BP 118/76 mmHg, SpO2 98% on room air. Chest examination reveals only scattered end-inspiratory crackles. Chest X-ray demonstrates diffuse patchy interstitial infiltrates appearing disproportionately severe compared to clinical findings. LDH is elevated at 680 U/L. Which of the following additional findings is most likely?
Answer choices
- ARust colored sputum and lobar consolidation
- BCold agglutinin mediated hemolysisCorrect answer
- CCavitary lesion with foul smelling sputum
- DCurrant jelly sputum in an alcoholic patient
- EEosinophilia with central bronchiectasis
- FErythema multiforme with mycoplasma-specific IgM antibodies
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