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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 42-year-old man presents to the emergency department with persistent cough. The patient states that for the past week he has been coughing. He also states that he has seen blood in his sputum and experienced shortness of breath. On review of systems, the patient endorses fever and chills as well as joint pain. His temperature is 102°F (38.9°C), blood pressure is 159/98 mmHg, pulse is 80/min, respirations are 14/min, and oxygen saturation is 98% on room air. Laboratory values are ordered as seen below.

Hemoglobin: 12 g/dL
Hematocrit: 36%
Leukocyte count: 7,500/mm^3 with normal differential
Platelet count: 107,000/mm^3

Serum:
Na+: 138 mEq/L
Cl-: 101 mEq/L
K+: 4.2 mEq/L
HCO3-: 24 mEq/L
BUN: 32 mg/dL
Glucose: 99 mg/dL
Creatinine: 1.9 mg/dL
Ca2+: 10.0 mg/dL
AST: 11 U/L
ALT: 10 U/L

Urine:
Color: Amber, cloudy
Red blood cells: Positive
Protein: Positive

Which of the following is the best next step in management?
assistant
Type IV collagen antibody levels