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 24-year-old previously healthy man comes to his physician because of dyspnea and hemoptysis for the past week. Examination shows inspiratory crackles at both lung bases. The remainder of the examination shows no abnormalities. His hemoglobin concentration is 14.2 g/dL, leukocyte count is 10,300/mm3, and platelet count is 205,000/mm3. Urine dipstick shows 2+ proteins. Urinalysis shows 80 RBC/hpf and 1–2 WBC/hpf. An x-ray of the chest shows pulmonary infiltrates. Further evaluation is most likely to show increased serum titers of which of the following?
assistant
Anti-GBM antibody