system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 38-year-old man comes to the physician because of a 1-month history of fever and a cough productive of a moderate amount of yellowish sputum. He has had a 6-kg (13-lb) weight loss during this period. He emigrated from the Middle East around 2 years ago. His father died of lung cancer at the age of 54 years. He has smoked one pack of cigarettes daily for 18 years. He appears malnourished. His temperature is 38.1°C (100.6°F), pulse is 101/min, and blood pressure is 118/72 mm Hg. Crackles are heard on auscultation of the chest. Cardiac examination shows no abnormalities. The abdomen is soft and nontender. Laboratory studies show:
Hemoglobin 12.3 g/dL
Leukocyte count 13,200/mm3
Platelet count 330,000/mm3
Erythrocyte sedimentation rate 66 mm/h
Serum
Urea nitrogen 16 mg/dL
Glucose 122 mg/dL
Creatinine 0.9 mg/dL
Urinalysis is within normal limits. An x-ray of the chest is shown. Which of the following is the most appropriate next step in management?"
assistant
Collect sputum specimens for acid-fast bacilli smear microscopy, culture, and nucleic acid amplification