A 28-year-old man presents to his primary care physician for evaluation of night sweats and cough over the past 2 months. His past medical history is significant for Crohn disease, which has been well managed on infliximab. Vitals are significant for a temperature of 100.1°F (37.8°C) and BMI of 21 kg/m2 which is decreased from 23 kg/m2 6 months ago. Physical examination is significant for lymphadenopathy and crackles on lung auscultation. During the examination, the patient coughs and produces a small amount of blood tinged sputum.
Which of the following tests is most helpful in confirming the most likely diagnosis?
- A) Acid fast bacilli stain of sputum
- B) Bronchoalveolar lavage
- C) Colonoscopy with mucosal biops
- D) India ink stain of cerebrospinal fluid (CSF)
- E) Magnetic resonance imaging (MRI) of the chest