A 22-year-old man has had worsening malaise along with hemoptysis for the past 2 days. On exam there are crackles auscultated over both lungs. Laboratory studies show serum creatinine 2.7 mg/dL and urea nitrogen 26 mg/dL. A renal biopsy is obtained and the direct immunofluoresence staining pattern with antibody to IgG of is seen here. Which of the following serum laboratory test findings is most likely to be present in this man?
- High antinuclear antibody test titer
- Elevated antistreptolysin O titer
3) Presence of anti-glomerular basement membrane antibody - Positive anti-neutrophil cytoplasmic autoantibody test
- Increased hemoglobin A1C