Review Question - QID 212512

A 59-year-old man comes to the clinic for an annual well-exam. He was lost to follow-up for the past 3 years due to marital issues but reports that he feels fine. The patient reports, “I feel tired but it is probably because I am getting old. I do feel a little feverish today - I think I got a cold.” His past medical history is significant for hypertension that is controlled with hydrochlorothiazide. He reports fatigue, congestion, cough, and night sweats. He denies any sick contacts, recent travel, weight changes, chest pain, or dizziness. His temperature is 101°F (38.3°C), blood pressure is 151/98 mmHg, pulse is 97/min, and respirations are 15/min. His laboratory values are shown below:

Hemoglobin: 13.5 g/dL
Hematocrit: 41%
Leukocyte count:  25,000/mm^3
Segmented neutrophils: 73%
Bands: 8% 
Eosinophils: 1%
Basophils: 2%
Lymphocytes: 15%
Monocytes: 2%
Platelet count: 200,000/mm^3

What diagnostic test would be helpful in distinguishing this patient’s condition from pneumonia?